CN103728648A - Method and equipment for determining background of uranium hexafluoride gas uranium abundance measuring device - Google Patents

Abstract

The invention provides a method and equipment for determining the background of a device for measuring the uranium abundance of uranium hexafluoride gas. The method comprises: a flowing step, which makes the same _UF6 gas flow into or out of the measuring container; a sealing step, which closes the measuring container, so that the _UF6 gas in the measuring container stops flowing; a measuring step, which makes the UF6 gas in the measuring container After the pressure of the ₆ gas is stable, measure the total count rate value, pressure value and temperature value of the gamma ray interval of interest of the UF ₆ gas; and the calculation step, repeat the flow step, the sealing step and the measurement step n times to obtain n gamma In the case of the total count rate value, n pressure values and n temperature values in the ray interest interval, the calculation step uses the measured n gamma ray interest interval total count rate values, n pressure values and n temperature values to calculate the background count rate value of the γ-ray interest interval of the UF ₆ gas uranium abundance measuring device, where n is an integer greater than or equal to 2.

Description

Method and apparatus for determining the background of a device for measuring uranium abundance in uranium hexafluoride gas

technical field

The invention relates to a device for measuring the uranium abundance of uranium hexafluoride gas, in particular to a method and equipment for determining the background of the device for measuring the uranium abundance of uranium hexafluoride gas.

Background technique

A uranium enrichment plant is a nuclear facility that conducts uranium enrichment activities, and is one of the key objects of arms control inspection and safeguard supervision. Uranium enrichment plants all use mass spectrometers to monitor the abundance of uranium ( ²³⁵ U) in UF ₆ (uranium hexafluoride) gas in pipelines. This technology has high precision, but the operation is complex, costly, and the analysis period is long. Professionals are required . The online uranium enrichment technology includes two parts: the measurement of ²³⁵ U and the measurement of the total amount of uranium in UF ₆ gas. The measurement of ²³⁵ U is determined by measuring the intensity of the 185.7keV characteristic γ-ray emitted by it.

Fig. 1 shows a related art UF ₆ gas uranium abundance measuring device, which is used to measure the UF ₆ gas uranium abundance in the pipeline of a centrifugal enrichment plant. The UF ₆ gas uranium abundance measuring device is mainly used in the field of production process monitoring in uranium enrichment plants, arms control verification, and international nuclear safeguards. The device can monitor the uranium abundance in the UF ₆ gas in the process pipeline of the uranium enrichment plant on-line and in real time, and can promptly and quickly reflect the production process status of the uranium enrichment plant, which is of great importance to the supervision and normal operation of the production process of the uranium enrichment plant. The practical significance and promotion and application value.

The UF ₆ gas uranium abundance measurement device shown in Figure 1 is connected to the process pipeline of the uranium enrichment plant in the form of a bypass, and the UF ₆ gas in the process pipeline flows through the device, and the gas pressure, temperature and γ-ray intensity are measured to get the uranium abundance in UF ₆ gas. The UF ₆ gas uranium abundance measuring device shown in Fig. 1 includes a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5 and a sixth valve 6, and also includes a first solenoid valve 11 and the second solenoid valve 12. The UF ₆ gas uranium abundance measuring device shown in FIG. 1 also includes a pressure sensor P and a temperature sensor T. The pressure sensor P measures the pressure of the UF ₆ gas, while the temperature sensor T measures the temperature of the UF ₆ gas.

The "background" of the device refers to the contribution to the ray measurement of the region of interest caused by factors other than the contribution to the ray measurement of the region of interest produced by the UF ₆ gas in the container to be measured when the ray measurement is performed. For example, "background" includes the radiometric contribution of uranium due to its deposition in the UF ₆ gas uranium abundance measurement device. The background of the device has a direct impact on the abundance measurements. Once the device is determined, its corresponding scale factor is also fixed. Experiments have found that the abundance value will deviate from the actual value after a certain period of time, and the main reason for the deviation of the abundance value from the actual value is the change of the background, for example, the change of the background caused by the deposition and accumulation of uranium in the measuring device. Actual measurements found that the background varied greatly and increased over time. Therefore, accurate monitoring of the device background is required.

The current background measurement method is to disconnect the UF6 gas uranium abundance measurement device from the process pipeline, then condense and recycle the UF ₆ in the UF6 gas uranium abundance measurement device, and then vacuumize the system , and then measure the background for a long time to obtain the background count rate S _B of the interval of interest in the ray measurement. This method is complicated to operate, takes a long time (at least 3 hours for each measurement), requires human intervention, has large measurement errors, and does not conform to the actual operating conditions of the device (the device is measured in the presence of gas, and the background is in the absence of gas measurement).

Contents of the invention

The purpose of the present invention is to provide a method and equipment for determining the background of a UF6 gas uranium abundance measuring device, and the method and device can be convenient and quick when the UF6 gas uranium abundance measuring device maintains a normal working state The background of the UF6 gas uranium abundance measuring device can be accurately determined.

In one aspect, an embodiment of the present invention provides a method for determining the background of a UF6 gas uranium abundance measuring device, which includes the following steps: a flow step, which allows the same UF6 gas to flow into or out of the The measuring container of the gas uranium abundance measuring device; the sealing step, the step is to close the measuring container, so that the UF6 gas in the measuring container stops flowing; the measuring step, the step is to seal the UF6 gas in the measuring container After the pressure of the uranium gas is stable, measure the total count rate value, gas pressure value and gas temperature value of the gamma ray interest interval of the uranium hexafluoride gas; and the calculation step, after repeatedly performing the flow step, the sealing step and In the case where the measuring step is n times to obtain the total count rate value of n gamma ray intervals of interest, n gas pressure values and n gas temperature values, the calculation step uses the measured n gamma ray interest The total count rate value of the interval, n gas pressure values and n gas temperature values are used to calculate the background count rate value of the γ-ray interest interval of the uranium hexafluoride gas uranium abundance measuring device, wherein, n is greater than or equal to 2 an integer of .

According to one aspect of the present invention, the calculation step uses the following formula to calculate the background count rate value of the γ-ray interest interval of the uranium hexafluoride gas uranium abundance measurement device:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}$

In this formula: E _n is the uranium abundance in the uranium hexafluoride gas when the measurement step is performed for the nth time; S _n is the gamma ray measured when the measurement step is performed for the nth time. The total count rate value of the interval; S _B ⁿ is the background count rate value of the gamma ray interval of interest when the measurement step is performed for the nth time; P _n is the gas pressure value measured when the measurement step is performed for the nth time; T _n is the gas temperature value measured when the measuring step is performed for the nth time; and K is the calibration coefficient of the UF ₆ gas uranium abundance measuring device.

According to one aspect of the present invention, the calculating step calculates the uranium hexafluoride gas according to the characteristic that the background count rate value of the gamma-ray interest interval of the uranium hexafluoride gas uranium abundance measurement device remains unchanged for a certain period of time. The background count rate value of the gamma-ray interest interval of the uranium gas uranium abundance measurement device, wherein, since the UF6 gas is the same UF6 gas, n times when the measurement step is performed n times The uranium abundance values E ₁ ... E _n in UF6 gas are equal.

According to an aspect of the present invention, the calculation step calculates the background count rate value S _B of the gamma-ray interval of interest that remains unchanged when the flow step, the sealing step and the measurement step are performed n times according to the following formula ¹ ... S _B ⁿ :

$\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; .</span>$

According to one aspect of the present invention, ${{\mathrm{<figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout>}}_B}^1={S_B}^{\mathrm{no}}=\frac{P_1{S}_{\mathrm{no}}{T}_{\mathrm{no}}-P_{\mathrm{no}}{S}_1{T}_1}{P_1{T}_{\mathrm{no}}-P_{\mathrm{no}}{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">T</figure-callout>}}_1}.$

According to one aspect of the present invention, under the condition that the temperature of the UF6 gas in the measurement container remains constant, the calculation step is based on the total count rate value of the n gamma ray intervals of interest and the n gas pressure values for fitting.

According to one aspect of the present invention, when the fitting is performed, the total count rate value of the γ-ray interval of interest when the gas pressure value is 0 is the value of the uranium abundance measuring device for UF6 gas. The background count rate value of the gamma-ray interval of interest.

In another aspect, an embodiment of the present invention provides a device for determining the background of a UF6 gas uranium abundance measurement device, which includes: a flow module, which allows the same UF6 gas to flow into or out of the gas The measuring container of the uranium abundance measuring device; the sealing module, which closes the measuring container, so that the flow of UF6 gas in the measuring container is stopped; After the pressure of the uranium gas is stable, measure the total count rate value, gas pressure value and gas temperature value of the γ-ray interest interval of the UF6 gas; and a calculation module, in the flow module, the closed module and the measurement When the module repeats operations n times to obtain the total count rate value of n gamma-ray intervals of interest, n gas pressure values and n gas temperature values, the calculation module uses the measured n gamma-ray interest The total count rate value of the interval, n gas pressure values and n gas temperature values are used to calculate the background count rate value of the γ-ray interest interval of the uranium hexafluoride gas uranium abundance measuring device, wherein, n is greater than or equal to 2 an integer of .

According to another aspect of the present invention, the calculation module uses the following formula to calculate the background count rate value of the γ-ray interest interval of the uranium hexafluoride gas uranium abundance measurement device:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}$

In this formula: E _n is the uranium abundance in the UF6 gas when the measurement module performs the nth operation; S _n is the gamma ray measured when the measurement module performs the nth operation The total count rate value of the interval of interest; S _B ⁿ is the background count rate value of the gamma ray interval of interest when the measurement module performs the nth operation; P _n is measured when the measurement module performs the nth operation gas pressure value; T _n is the gas temperature value measured when the measurement module performs the nth operation; and K is the scale factor of the UF ₆ gas uranium abundance measuring device.

According to another aspect of the present invention, the calculation module calculates the uranium hexafluoride gas uranium abundance measurement device according to the characteristic that the background count rate value of the gamma ray interval of interest remains unchanged for a certain period of time. The background count rate value of the gamma-ray interest interval of the uranium fluoride gas uranium abundance measuring device, wherein, since the uranium hexafluoride gas is the same kind of uranium hexafluoride gas, when the measurement module performs n operations The uranium abundance values E ₁ ... E _n in n UF6 gases are equal.

According to another aspect of the present invention, the calculation module calculates the background count rate in the interval of interest of gamma rays that remains unchanged when the flow module, the closure module and the measurement module are repeatedly operated n times according to the following formula Values S _B ¹ ...S _B ⁿ :

$\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; .</span>$

According to another aspect of the present invention, ${{\mathrm{<figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout>}}_B}^1={S_B}^{\mathrm{no}}=\frac{P_1{S}_{\mathrm{no}}{T}_{\mathrm{no}}-P_{\mathrm{no}}{S}_1{T}_1}{P_1{T}_{\mathrm{no}}-P_{\mathrm{no}}{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">T</figure-callout>}}_1}.$

According to another aspect of the present invention, under the condition that the temperature of the UF6 gas in the measurement container remains constant, the calculation module calculates the total count rate value of the n gamma-ray intervals of interest and the The above n gas pressure values are used for fitting.

According to another aspect of the present invention, in the case of performing the fitting, the total count rate value of the γ-ray interval of interest when the gas pressure value is 0 is the uranium abundance measuring device for the UF6 gas The background count rate value of the γ-ray interval of interest.

According to the method and equipment for determining the background of the UF6 gas uranium abundance measuring device of the present invention, the UF6 gas can be quickly and accurately measured without disconnecting the UF6 gas uranium abundance measuring device from the process pipeline Background of gas uranium abundance measurement device. The method is simple to operate, takes short time, does not require human intervention, has small measurement errors, and is consistent with the actual operating conditions of the uranium abundance measuring device for uranium hexafluoride gas. Moreover, it is not necessary to know the calibration coefficient of the UF ₆ gas uranium abundance measuring device, and the value of the background count rate in the interval of interest of the gamma ray can also be obtained.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some implementations of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without creative work.

Fig. 1 shows a related art UF ₆ gas uranium abundance measuring device.

Fig. 2 shows a method for determining the background of a UF ₆ gas uranium abundance measuring device according to the present invention.

Fig. 3 shows a curve diagram of the total count rate and pressure value of the γ-ray interest interval of UF ₆ gas measured according to the method for determining the background of the UF ₆ gas uranium abundance measuring device of the present invention.

Fig. 4 shows a device for determining the background of a UF ₆ gas uranium abundance measuring device according to the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

FIG. 2 shows a method 200 for determining the background of a UF ₆ gas uranium abundance measurement device according to the present invention.

The method 200 for determining the background of the _UF6 gas uranium abundance measuring device shown in Figure 2 comprises the following steps: a flow step S201, which makes the same _UF6 gas flow into or out of the measuring container of the gas uranium abundance measuring device; the sealing step S202, this step seals the measurement container, so that the UF gas in the measurement container stops flowing; measurement step S203, after _the pressure of the UF gas in the measurement container is stable, measure the total count of the γ _- ray interest interval _of the UF gas rate value, gas pressure value and gas temperature value; and calculation step S204, in repeating flow step, sealing step and measurement step n times to obtain n gamma ray interest interval total count rate value, n gas pressure values and n In the case of several gas temperature values, the calculation step uses the measured total count rate values of n gamma ray intervals of interest, n gas pressure values and n gas temperature values to calculate the gamma of the UF ₆ gas uranium abundance measuring device The value of the background count rate in the interval of interest of the ray, where n is an integer greater than or equal to 2.

In the method 200 for determining the background of the UF ₆ gas uranium abundance measuring device shown in FIG. 2 , the calculation step S204 uses formula (1) to calculate the background count rate of the γ-ray interest interval of the UF ₆ gas uranium abundance measuring device value:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1): E _n is the uranium abundance in UF ₆ gas when the measurement step S203 is performed for the nth time; S _n is the total count rate of the γ-ray interest interval measured when the measurement step S203 is performed for the nth time Value; S _B ⁿ is the background count rate value of the γ-ray interval of interest when the nth execution of the measurement step S203; P _n is the gas pressure value measured when the nth execution of the measurement step S203; T _n is the nth time The gas temperature value measured when performing the measuring step S203; and K is the calibration factor of the UF ₆ gas uranium abundance measuring device.

It should be noted that both E _n and S _B ⁿ are not physical quantities measured when the measuring step S203 is performed, but existing physical quantities when the measuring step S203 is performed. In addition, according to the present invention, there is no need to actually find out _the uranium abundance E _n in UF ₆ gas, _and it is not necessary to know the calibration coefficient K of the UF ₆ gas uranium abundance measuring device, and _the to find S _B ⁿ .

According to practical experience, the background of the UF ₆ gas uranium abundance measurement device can be regarded as constant within a relatively long period of time. For example, the background change of the UF ₆ gas uranium abundance measurement device in actual operation can be considered to have no influence on the abundance measurement within a few days. Therefore, the calculation step S204 calculates the UF 6 gas uranium abundance measuring device according to the characteristic that the background count rate value of the gamma ray interest interval of the UF ₆ gas uranium abundance measuring device remains unchanged for a certain period of time (for example, 3 days). The background count rate value of the γ-ray interval of interest. In particular, since the UF ₆ gas to be measured is the same UF ₆ gas, the uranium abundance values E ₁ ... E _n in the n UF ₆ gases are equal when the measurement step S203 is performed n times.

That is, the calculation step S204 calculates the background count rate values S _B ¹ ... S _B ⁿ of the gamma-ray interval of interest that remain unchanged when the flowing step, the sealing step and the measuring step are performed n times according to formula (2):

$\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In formula (2) _, the background count rate ^values S _B ¹ .

That is, according to formula (2), the following formula (3) can be obtained:

${{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout></span><figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

It can be seen that, according to the formula (3), the background count rate values S _B ¹ ..., S _B ⁿ of the gamma-ray interval of interest during all n measurements can be obtained. Moreover, it is not necessary to know the calibration coefficient K of the UF ₆ gas uranium abundance measuring device, and the background count rate values S _B ¹ ..., S _B ⁿ of the γ-ray interest interval during all n measurements can also be obtained.

Due to the scale factor K of the UF ₆ gas uranium abundance measuring device, the total count rate value S ₁ ... S _n of the γ-ray interval of interest measured by performing the measurement step S203 n times, the gas pressure P ₁ ... P _n and the gas temperature T ₁ ...T _n is known, so the background count rate values S _B ¹ ...S _B ⁿ of the γ-ray interval of interest during all n measurements can be obtained. In addition, it can be seen from formula (2) that even if the calibration coefficient K of the UF ₆ gas uranium abundance measuring device is not known, the background count rate value S _B ¹ ... S _B of the γ-ray interest interval during all n measurements can be obtained ⁿ .

As an example, the method for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention can be implemented for the UF ₆ gas uranium abundance measuring device shown in FIG. 1 . When determining the background, all valves of the UF ₆ gas uranium abundance measuring device shown in Fig. 1 except the second manual valve 2, the third manual valve 3, the fifth manual valve 5 and the sixth manual valve 6 are closed Besides, the rest of the first manual valve 1 , the fourth manual valve 4 , the first solenoid valve 11 and the second solenoid valve 12 are all open. At the beginning of the method for determining the background of the UF ₆ gas uranium abundance measuring device of the present invention, UF ₆ gas flows into the measurement container in a self-flowing form, and then automatically closes the first electromagnetic valve 11 and the second electromagnetic valve 12 . After the gas pressure is stable, the UF ₆ gas in the device is automatically measured. At this time, the uranium abundance in the UF ₆ gas in the measurement container is determined by the following equation. After the primary flow step S201, the closing step S202, the measuring step S203 and the calculating step S204 are completed, the second solenoid valve 12 or the first solenoid valve 11 is automatically opened, so that a part of the UF ₆ gas in the system flows out or enters a part and then closes . Then measure again, and so on. This changes the amount of UF ₆ gas measured each time, while the uranium abundance in the UF ₆ gas does not change. In this way, the background count rate value of the γ-ray interval of interest can be calculated according to the above formulas (1) and (2).

In another example, in addition to using the above formulas (1) and (2) to calculate the background count rate value of the γ-ray interest interval, the method for the background of the UF ₆ gas uranium abundance measuring device of the present invention can also be used in the When the temperature of the UF ₆ gas in the measurement container remains constant, the background count of the gamma-ray interval of interest is calculated by fitting the total count rate value of n gamma-ray intervals of interest and n gas pressure values rate value. Specifically, when the gas pressure value is 0, the total count rate value of the γ-ray interest interval is the background count rate value of the γ-ray interest interval of the UF ₆ gas uranium abundance measuring device.

Fig. 3 shows a curve diagram of the total count rate and pressure value of the γ-ray interest interval of UF ₆ gas measured according to the method for determining the background of the UF ₆ gas uranium abundance measuring device of the present invention.

In Fig. 3, the abscissa is the gas pressure value in the measuring container of the UF ₆ gas uranium abundance measuring device, and the ordinate is the total count rate value of the γ-ray interest interval of the UF ₆ gas. As shown in Fig. 3, the y-coordinate is the total count rate value of the gamma-ray interest interval of UF ₆ gas and the gas pressure value has a linear relationship. Therefore, by fitting the total count rate value and the gas pressure value of the γ-ray interval of interest, the intercept when the gas pressure is 0 is the background count rate of the γ-ray interval of interest. That is, this value represents the gamma ray count rate in the measurement container of the UF ₆ gas uranium abundance measuring device in the absence of UF ₆ gas.

As another example, the basic process of applying the method for determining the background of the _UF6 gas uranium abundance measuring device to the _UF6 gas uranium abundance measuring device shown in Figure 1 is as follows:

1) First close the second solenoid valve 12 to increase the pressure of UF ₆ gas in the measurement container, then close the first solenoid valve 11 to measure the count rate S ₁ of the gamma-ray interesting interval and the pressure P ₁ in the container;

2) Then, open the second electromagnetic valve 12 to deflate, so that the air pressure in the measurement container is slightly lowered, close the second electromagnetic valve 12, and measure the count rate S ₂ of the gamma ray interval of interest and the pressure P ₂ in the container;

3) Repeat this for many times (such as n times) until the pressure in the container drops to a low level, so that a series of S _n and P _n can be obtained;

4) Fitting S _n and P _n after n measurements can obtain the fitting curves of counting rate S ₁ ... S _n and gas pressure P ₁ ... P _n in n gamma-ray intervals of interest (see Figure 3) ;

5) Determine the count rate of the γ-ray interval of interest when the intercept corresponds to P=0, that is, the background S _B .

It should be noted that the above only describes the case of measuring different gamma ray intervals of interest count rate S and container internal pressure P through multiple deflation (UF ₆ gas outflow) operations, but the present invention is not limited thereto. According to the specification, those skilled in the art can measure by making UF ₆ gas flow into or out of the measuring container to determine the background of the UF ₆ gas uranium abundance measuring device.

In addition, the method for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention is not limited to determining the background of the UF ₆ gas uranium abundance measuring device shown in Figure 1, but can be used to determine various UF ₆ gas uranium The background of the abundance measurement device.

FIG. 4 shows a device 400 for determining the background of a UF ₆ gas uranium abundance measurement device according to the present invention.

The device 400 for determining the background of a UF ₆ gas uranium abundance measuring device according to the present invention shown in FIG. 4 includes: a flow module 401, which allows the same UF ₆ gas to flow into or out of the measuring container of the gas uranium abundance measuring device; Closing module 402, this module closes the measurement container, so that the UF ₆ gas in the measurement container stops flowing; measurement module 403, this module measures the γ-ray interest interval of UF ₆ gas after the pressure of the UF ₆ gas in the measurement container is stable The total count rate value, the gas pressure value and the gas temperature value; and the calculation module 404, which repeats n times of operations in the flow module, the closed module and the measurement module to obtain the total count rate value of n gamma ray intervals of interest, n gas pressure values In the case of n values and n gas temperature values, the calculation module uses the measured total count rate values of n gamma ray intervals of interest, n gas pressure values and n gas temperature values to calculate the UF ₆ gas uranium abundance measurement The background count rate value of the γ-ray interest interval of the device, wherein, n is an integer greater than or equal to 2.

In the device 400 for determining the background of the UF ₆ gas uranium abundance measurement device according to the present invention shown in FIG. 4 , the calculation module 404 uses formula (2) to calculate the γ-ray interest interval of the UF ₆ gas uranium abundance measurement device Background count rate value:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1): E _n is the uranium abundance in UF ₆ gas when the measurement module performs the nth operation; S _n is the total count rate of the γ-ray interest interval measured by the measurement module when the nth operation is performed S _B ⁿ is the background count rate value of the gamma ray interval of interest when the measurement module performs the nth operation; P _n is the gas pressure value measured when the measurement module performs the nth operation; T _n is the measurement module. The gas temperature value measured during the nth operation; and K is the calibration coefficient of the UF ₆ gas uranium abundance measuring device.

It should be noted that neither E _n nor S _B ⁿ is a physical quantity measured by the measurement module 403 , but a physical quantity that already exists when the measurement module 403 measures S _n , P _n and T _n . In addition, according to the present invention, there is no need to actually find out _the uranium abundance E _n in UF ₆ gas, _and it is not necessary to know the calibration coefficient K of the UF ₆ gas uranium abundance measuring device, and _the to find S _B ⁿ .

In the device 400 _for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention shown in FIG. To calculate the background count rate value of the γ-ray interest interval of the UF ₆ gas uranium abundance measurement device by keeping the characteristics of the time period constant. In particular, since the UF ₆ gas is the same UF ₆ gas, the uranium abundance values E _{1 .} . . E _n in the n UF ₆ gases are equal when the measurement module 403 performs n measurements.

It should be noted that neither E _n nor S _B ⁿ is a physical quantity measured by the processing module 403 , but a physical quantity that already exists when the processing module 403 performs the measurement. In addition, according to the present invention, S _B ⁿ can be calculated from S _n , P _n and T _n without actually calculating the uranium abundance E _n in UF ₆ gas.

In the device 400 for determining the background of the UF ₆ gas uranium abundance measuring device shown in FIG. The background count rate values S _B ¹ ... S _B ⁿ of the γ-ray interval of interest that remain unchanged:

$\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula (2), the background count rate values S _B ¹ ... S _B ⁿ of the gamma-ray interval of interest during all n measurements are equal.

That is, according to formula (2), the following formula (3) can be obtained:

${{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout></span><figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

It can be seen that, according to the formula (3), the background count rate values S _B ¹ ..., S _B ⁿ of the gamma-ray interval of interest during all n measurements can be obtained. Moreover, it is not necessary to know the calibration coefficient K of the UF ₆ gas uranium abundance measuring device, and the background count rate values S _B ¹ ..., S _B ⁿ of the γ-ray interest interval during all n measurements can also be obtained.

In _the device 400 for determining the background of the UF ₆ gas uranium abundance measuring device shown in FIG. The total count rate value of the γ-ray interval of interest and n gas pressure values are used for fitting. In particular, in the case of fitting, the total count rate value of the γ-ray interval of interest when the gas pressure value is 0 is the background count rate value of the γ-ray interval of interest of the UF ₆ gas uranium abundance measurement device.

The device for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention is not limited to determining the background of the UF ₆ gas uranium abundance measuring device shown in Figure 1, but can be used to determine various UF ₆ gas uranium abundances The background of the measuring device.

The present invention also provides a computer-readable storage medium storing instructions for executing the method 200 for determining the background of a UF ₆ gas uranium abundance measuring device according to the present invention.

Through the method for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention, multiple measurements can be performed to reduce the statistical error of the measurement result, no manual operation is required, the method is convenient and fast, and the measurement error is small. After testing, the results show that the background accuracy of this method is about 1%, and the relative error of its influence on the abundance results is not higher than 0.3%.

Moreover, the method and equipment for determining the background of the UF ₆ gas uranium abundance measuring device according to the present invention can quickly and accurately determine the UF ₆ gas uranium abundance without disconnecting the UF ₆ gas uranium abundance measuring device from the process pipeline The background of the measuring device. The method is simple to operate, takes short time, does not require human intervention, has small measurement errors, and is consistent with the actual operating conditions of the uranium abundance measuring device for uranium hexafluoride gas.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (14)

1. A method for determining the background of a uranium hexafluoride gas uranium abundance measuring device, characterized in that it comprises the following steps: a flowing step of causing the same UF6 gas to flow into or out of the measuring vessel of the device for measuring the uranium abundance of said gas; a sealing step, which is to seal the measuring container, so that the flow of UF6 gas in the measuring container is stopped; A measuring step, which measures the total count rate value, gas pressure value and gas temperature value of the gamma ray interest interval of the UF6 gas after the pressure of the UF6 gas in the measuring container is stable; and Calculation step, in the case of repeating the flow step, the sealing step and the measurement step n times to obtain n gamma ray interest interval total count rate values, n gas pressure values and n gas temperature values , the calculating step calculates the gamma ray of the uranium hexafluoride gas uranium abundance measuring device by using the measured total count rate value of n gamma ray intervals of interest, n gas pressure values and n gas temperature values The background count rate value in the interval of interest, Wherein, n is an integer greater than or equal to 2. 2. The method for determining the background of the UF6 gas uranium abundance measuring device according to claim 1, wherein the calculation step uses the following formula to calculate the UF6 gas uranium abundance measuring device The background count rate value of the gamma-ray interval of interest: ${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}$ In this formula: E _n is the uranium abundance in the uranium hexafluoride gas when the measurement step is performed for the nth time; S _n is the gamma ray measured when the measurement step is performed for the nth time. The total count rate value of the interval; S _B ⁿ is the background count rate value of the gamma ray interval of interest when the measurement step is performed for the nth time; P _n is the gas pressure value measured when the measurement step is performed for the nth time; T _n is the gas temperature value measured when the measuring step is performed for the nth time; and K is the calibration coefficient of the UF ₆ gas uranium abundance measuring device. 3. The method for determining the background of the UF6 gas uranium abundance measuring device according to claim 2, wherein the calculation step is based on the gamma-ray interest of the UF6 gas uranium abundance measuring device The interval background count rate value remains unchanged for a certain period of time to calculate the gamma ray interest interval background count rate value of the uranium hexafluoride gas uranium abundance measuring device, Wherein, since the UF6 gas is the same UF6 gas, the uranium abundance values E ₁ ... E _n in the n UF6 gases are equal when the measuring step is performed n times. 4. The method for determining the background of a UF6 gas uranium abundance measuring device according to claim 3, wherein the calculation step is calculated according to the following formula when performing the flow step, the sealing step and the The background count rate value S _B ¹ ... S _B ⁿ of the γ-ray interval of interest that remains unchanged when the above measurement steps are n times: $\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; .</span>$ 5. The method for determining the background of the uranium hexafluoride gas uranium abundance measuring device according to claim 4, characterized in that, ${{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; .</span>$ 6. The method for determining the background of the UF6 gas uranium abundance measuring device according to claim 1, characterized in that, when the temperature of the UF6 gas in the measuring container remains constant , the calculating step performs fitting on the total count rate values of the n γ-ray intervals of interest and the n gas pressure values. 7. The method for determining the background of a UF6 gas uranium abundance measuring device according to claim 6, characterized in that, in the case of performing the fitting, when the gas pressure value is 0, the γ The total count rate value of the ray interest interval is the background count rate value of the gamma ray interest interval of the uranium hexafluoride gas uranium abundance measuring device. 8. A device for determining the background of a uranium abundance measuring device for UF6 gas, characterized by comprising: a flow module that causes the same UF6 gas to flow into or out of the measuring vessel of the device for measuring the uranium abundance of said gas; a closing module, which closes the measuring container and stops the flow of UF6 gas in the measuring container; a measurement module, which measures the total count rate value, gas pressure value and gas temperature value of the γ-ray interest interval of the UF6 gas after the pressure of the UF6 gas in the measurement container is stable; and A calculation module, repeating n times of operations in the flow module, the closure module and the measurement module to obtain n gamma ray interest interval total count rate values, n gas pressure values and n gas temperature values Next, the calculation module calculates the γ value of the uranium hexafluoride gas uranium abundance measuring device by using the measured total count rate values of n gamma ray intervals of interest, n gas pressure values and n gas temperature values The background count rate value in the interval of interest of the ray, Wherein, n is an integer greater than or equal to 2. 9. The device for determining the background of the UF6 gas uranium abundance measuring device according to claim 8, wherein the calculation module uses the following formula to calculate the UF6 gas uranium abundance measuring device The background count rate value of the gamma-ray interval of interest: ${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}$ In this formula: E _n is the uranium abundance in the UF6 gas when the measurement module performs the nth operation; S _n is the gamma ray measured when the measurement module performs the nth operation The total count rate value of the interval of interest; S _B ⁿ is the background count rate value of the gamma ray interval of interest when the measurement module performs the nth operation; P _n is measured when the measurement module performs the nth operation gas pressure value; T _n is the gas temperature value measured when the measurement module performs the nth operation; and K is the scale factor of the UF ₆ gas uranium abundance measuring device. 10. The device for determining the background background of the UF6 gas uranium abundance measuring device according to claim 9, characterized in that, the calculation module is interested in gamma rays according to the uranium hexafluoride gas uranium abundance measuring device The interval background count rate value remains unchanged for a certain period of time to calculate the gamma ray interest interval background count rate value of the uranium hexafluoride gas uranium abundance measuring device, Wherein, since the UF6 gas is the same UF6 gas, the uranium abundance values E ₁ ... E _n in the n UF6 gases are equal when the measurement module performs n operations. 11. The device for determining the background of a UF6 gas uranium abundance measuring device according to claim 10, wherein the calculation module is calculated according to the following formula in the flow module, the closed module and the The background count rate value S _B ¹ ... S _B ⁿ of the γ-ray interval of interest that remains unchanged when the measurement module repeats n operations: $\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; .</span>$ 12. The device for determining the background of the UF6 gas uranium abundance measuring device according to claim 11, characterized in that, ${{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; .</span>$ 13. The device for determining the background of the UF6 gas uranium abundance measuring device according to claim 8, characterized in that, when the temperature of the UF6 gas in the measuring container is kept constant , the calculation module performs fitting for the total count rate values of the n γ-ray intervals of interest and the n gas pressure values. 14. The device for determining the background of the UF6 gas uranium abundance measuring device according to claim 13, characterized in that, in the case of performing the fitting, when the gas pressure value is 0, the γ The total count rate value of the ray interest interval is the background count rate value of the gamma ray interest interval of the uranium hexafluoride gas uranium abundance measuring device.

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