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 uranium hexafluoride gas uranium abundance measuring device. The method includes the flow step, the sealing step, the measurement step and the calculation step. In the flow step, UF6 gas of the same kind is made to flow into or flow out of a measuring container. In the sealing step, the measuring container is sealed, and then the UF6 gas in the measuring container is made to stop flowing. In the measurement step, after the pressure of the UF6 gas in the measuring container is steady, the gamma ray section of interest gross-count rate value, the pressure value and the temperature value of the UF6 gas are measured. In the calculation step, under the condition that the flow step, the sealing step and the measurement step are repeatedly executed for n times to acquire n gamma ray section of interest gross-count rate values, n pressure values and n temperature values, and the gamma ray section of interest background counting rate value of the UF6 gas uranium abundance measuring device is calculated by the utilization of the measured n gamma ray section of interest gross-count rate values, the measured n pressure values and the measured n temperature values, wherein n is an integer which is larger than or equal to 2.

Description

Determine the method and apparatus of uranic hexafluoride gas uranium abundance measurement device background

Technical field

The present invention relates to uranic hexafluoride gas uranium abundance measurement device, relate in particular to the method and apparatus of determining uranic hexafluoride gas uranium abundance measurement device background.

Background technology

Uranium enrichment plant is the nuclear facilities that carries out uranium enrichment activity, is one of object of paying close attention to of arms control verification and safeguards.Uranium enrichment plant all adopts mass spectrograph to monitor UF in pipeline ₆uranium in (hex) gas ( ²³⁵u) abundance, this technology acuracy is high, but complicated operation expends height, and analytical cycle is long, needs to be equipped with professional.Online uranium abundance technology comprises two parts: ²³⁵measurement and the UF of U amount ₆the measurement of total uranium amount in gas. ²³⁵the measurement of U amount is to utilize the gamma-ray intensity of 185.7keV feature of measuring its transmitting to determine.

Fig. 1 shows a kind of UF of correlation technique ₆gas uranium abundance measurement mechanism, for the pipeline UF of centrifugal concentrating factory ₆the measurement of gas uranium abundance.UF ₆gas uranium abundance measurement mechanism is mainly used in Uranium enrichment plant's production technology monitoring field and arms control is verified, international nuclear safeguards field.UF in this device Neng Dui Uranium enrichment plant process pipeline ₆uranium abundance in gas is carried out on-line real time monitoring, and can promptly reflect in time Uranium enrichment plant's production technology situation, supervising and normally moving and have important practical significance and application value Uranium enrichment plant's production technology.

UF shown in Fig. 1 ₆gas uranium abundance measurement mechanism adopts the form access Uranium enrichment plant process pipeline of bypass, the UF in process pipeline ₆gas flow installs through this, by the mensuration of gaseous tension, temperature and gamma intensity is obtained to UF ₆uranium abundance in gas.UF shown in Fig. 1 ₆gas uranium abundance measurement mechanism comprises the first valve 1, the second valve 2, the 3rd valve 3, the 4th valve 4, the 5th valve 5 and the 6th valve 6, also comprises the first solenoid valve 11 and the second solenoid valve 12.UF shown in Fig. 1 ₆gas uranium abundance measurement mechanism also comprises pressure transducer P and temperature sensor T.Pressure transducer P measures UF ₆the pressure of gas, and temperature sensor T measures UF ₆the temperature of gas.

" background " of device refers to while carrying out radionetric survey, except UF in the container that will measure ₆the contribution to radionetric survey between region of interest that the other factors to outside the contribution of radionetric survey between region of interest that gas produces causes.For example, " background " comprises because uranium is at UF ₆its contribution to radionetric survey that deposition in gas uranium abundance measurement mechanism causes.The background of device has direct impact to abundance measurement result.Once after device is determined, its corresponding calibration factor is also just fixing.Experiment finds, Abundances can depart from actual value after the regular period, and the main cause that causes Abundances to depart from actual value is the variation of background, for example, and the variation of the background causing due to the deposition accumulation of uranium in measurement mechanism.Actual measurement finds that background alters a great deal, and increases in time.Therefore, need accurately monitor device background.

The sample-out count method of current employing is that uranic hexafluoride gas uranium abundance measurement device and process pipe are disconnected, then to the UF in uranic hexafluoride gas uranium abundance measurement device ₆carry out condensation, recovery, system is vacuumized, then background is measured to background counting rate S between the region of interest of radionetric survey for a long time _b.This method trivial operations, expend time in long (each measurement at least 3 hours), need human intervention, and measuring error is large, is not inconsistent (device is to have operating measurement in gas situation, and this background is to measure) with device actual motion condition when without gas.

Summary of the invention

The object of this invention is to provide the method and apparatus of determining uranic hexafluoride gas uranium abundance measurement device background, described method and apparatus keeps under the state of normal work the background of this uranic hexafluoride gas uranium abundance measurement device of Accurate Determining quickly and easily at uranic hexafluoride gas uranium abundance measurement device.

On the one hand, embodiment of the present invention provides a kind of method of definite uranic hexafluoride gas uranium abundance measurement device background, it comprises the following steps: flow step, and this step makes same uranic hexafluoride gas flow into or flow out the measuring vessel of described gas uranium abundance measurement mechanism; Sealing step, this step is sealed described measuring vessel, makes the uranic hexafluoride gas in described measuring vessel stop flowing; Measuring process, the pressure of the uranic hexafluoride gas of this step in described measuring vessel steadily after, measure gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of uranic hexafluoride gas; And calculation procedure, repeating described flow step, described sealing step and described measuring process n time to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, described calculation procedure utilizes gross-count rate value between measured n gamma-rays region of interest, a n gas pressure value and n gas temperature value to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device, wherein, n is more than or equal to 2 integer.

According to an aspect of the present invention, described calculation procedure utilizes following formula to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}$

In the formula: E _nit is the uranium abundance in the described uranic hexafluoride gas while carrying out described measuring process the n time; S _nit is gross-count rate value between the gamma-rays region of interest measuring while carrying out described measuring process the n time; S _b ⁿit is background counting rate value between the gamma-rays region of interest while carrying out described measuring process the n time; P _nit is the gas pressure value measuring while carrying out described measuring process the n time; T _nit is the gas temperature value measuring while carrying out described measuring process the n time; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

According to an aspect of the present invention, described calculation procedure is calculated background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device according to the characteristic that between described uranic hexafluoride gas uranium abundance measurement device gamma-rays region of interest, background counting rate value remains unchanged in certain hour section, wherein, because described uranic hexafluoride gas is uranic hexafluoride gas of the same race, so the uranium Abundances E in n uranic hexafluoride gas while carrying out described measuring process for n time ₁e _nequate.

According to an aspect of the present invention, described calculation procedure is calculated background counting rate value S between the gamma-rays region of interest remaining unchanged when carrying out described flow step, described sealing step and described measuring process n time according to following formula _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}.$

According to an aspect of the present invention, ${{\mathrm{<figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout>}}_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-{\mathrm{<figure-callout\; id="1"\; label="P\; n\; T"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_n{T}_{}{}_1}.$

According to an aspect of the present invention, in the situation that the temperature of the uranic hexafluoride gas in described measuring vessel remains is constant, described calculation procedure is carried out matching for gross-count rate value and a described n gas pressure value between described n gamma-rays region of interest.

According to an aspect of the present invention, in the situation that carrying out described matching, between the gamma-rays region of interest when described gas pressure value is 0, gross-count rate value is background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device.

On the other hand, embodiment of the present invention provides a kind of equipment of definite uranic hexafluoride gas uranium abundance measurement device background, it comprises: flow module, and this module makes same uranic hexafluoride gas flow into or flow out the measuring vessel of described gas uranium abundance measurement mechanism; Closed module, this module is sealed described measuring vessel, makes the uranic hexafluoride gas in described measuring vessel stop flowing; Measurement module, the pressure of the uranic hexafluoride gas of this module in described measuring vessel steadily after, measure gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of uranic hexafluoride gas; And computing module, at described flow module, described closed module and described measurement module, repeat n operation to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, described computing module utilizes gross-count rate value between measured n gamma-rays region of interest, a n gas pressure value and n gas temperature value to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device, wherein, n is more than or equal to 2 integer.

According to a further aspect in the invention, described computing module utilizes following formula to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}$

In the formula: E _nuranium abundance in described uranic hexafluoride gas while carrying out the n time operation for described measurement module; S _ngross-count rate value between the gamma-rays region of interest measuring while carrying out the n time operation for described measurement module; S _b ⁿbackground counting rate value between the gamma-rays region of interest while carrying out the n time operation for described measurement module; P _nthe gas pressure value measuring while carrying out the n time operation for described measurement module; T _nthe gas temperature value measuring while carrying out the n time operation for described measurement module; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

According to a further aspect in the invention, described computing module calculates background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device according to the characteristic that between described uranic hexafluoride gas uranium abundance measurement device gamma-rays region of interest, background counting rate value remains unchanged in certain hour section, wherein, because described uranic hexafluoride gas is uranic hexafluoride gas of the same race, the uranium Abundances E in n uranic hexafluoride gas when therefore described measurement module carries out n operation ₁e _nequate.

According to a further aspect in the invention, described computing module calculates background counting rate value S between the gamma-rays region of interest remaining unchanged when described flow module, described closed module and described measurement module repeat to operate for n time according to following formula _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}.$

According to a further aspect in the invention, ${{\mathrm{<figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout>}}_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-{\mathrm{<figure-callout\; id="1"\; label="P\; n\; T"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_n{T}_{}{}_1}.$

According to a further aspect in the invention, in the situation that the temperature of the uranic hexafluoride gas in described measuring vessel remains is constant, described computing module carries out matching for gross-count rate value and a described n gas pressure value between described n gamma-rays region of interest.

According to a further aspect in the invention, in the situation that carrying out described matching, between the gamma-rays region of interest when described gas pressure value is 0, gross-count rate value is background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device.

According to the method and apparatus of definite uranic hexafluoride gas uranium abundance measurement device background of the present invention, uranic hexafluoride gas uranium abundance measurement device and process pipe need not be disconnected to the background that gets final product fixed this uranic hexafluoride gas uranium abundance measurement device of quick accurately geodetic.This method is easy and simple to handle, expends time in short, does not need human intervention, and measuring error is little, conforms to uranic hexafluoride gas uranium abundance measurement device actual motion condition.And, can not need to know UF ₆the calibration factor of gas uranium abundance measurement mechanism, also can obtain background counting rate value between gamma-rays region of interest.

Accompanying drawing explanation

In order to be illustrated more clearly in embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 shows a kind of UF of correlation technique ₆gas uranium abundance measurement mechanism.

Fig. 2 shows according to definite UF of the present invention ₆the method of gas uranium abundance measurement mechanism background.

Fig. 3 shows according to definite UF of the present invention ₆the UF that the method for gas uranium abundance measurement mechanism background measures ₆gross-count rate value and force value curve map between the gamma-rays region of interest of gas.

Fig. 4 shows according to definite UF of the present invention ₆the equipment of gas uranium abundance measurement mechanism background.

Embodiment

Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 2 shows according to definite UF of the present invention ₆the method 200 of gas uranium abundance measurement mechanism background.

Definite UF shown in Fig. 2 ₆the method 200 of gas uranium abundance measurement mechanism background comprises the following steps: flow step S201, this step makes same UF ₆the measuring vessel of gas inflow or eluting gas uranium abundance measurement device; Sealing step S202, this step sealing measuring vessel, makes the UF in measuring vessel ₆gas stops flowing; Measuring process S203, the UF of this step in measuring vessel ₆the pressure of gas steadily after, measure UF ₆gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of gas; And calculation procedure S204, repeating flow step, sealing step and measuring process n time to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, calculation procedure utilizes gross-count rate value, a n gas pressure value and n gas temperature value between measured n gamma-rays region of interest to calculate UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism, wherein, n is more than or equal to 2 integer.

At the definite UF shown in Fig. 2 ₆in the method 200 of gas uranium abundance measurement mechanism background, calculation procedure S204 utilizes formula (1) to calculate UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}---\left(1\right)$

In formula (1): E _nbe the UF while carrying out measuring process S203 the n time ₆uranium abundance in gas; S _nit is gross-count rate value between the gamma-rays region of interest measuring while carrying out measuring process S203 the n time; S _b ⁿit is background counting rate value between the gamma-rays region of interest while carrying out measuring process S203 the n time; P _nit is the gas pressure value measuring while carrying out measuring process S203 the n time; T _nit is the gas temperature value measuring while carrying out measuring process S203 the n time; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

Be noted that E _nand S _b ⁿnot the physical quantity measuring when carrying out measuring process S203, but the physical quantity having existed when carrying out measuring process S203.In addition, according to the present invention, do not need the actual UF of obtaining ₆uranium abundance E in gas _n, and do not need to know UF ₆the calibration factor K of gas uranium abundance measurement mechanism, can be according to S _n, P _nand T _nobtain S _b ⁿ.

Known according to practical experience, UF ₆the background of gas uranium abundance measurement mechanism can be seen as between quite long constant.For example, the UF of actual motion ₆the background variation of gas uranium abundance measurement mechanism can be considered to can not exert an influence to the measurement of abundance in several days.Therefore the characteristic that, calculation procedure S204 for example, remains unchanged in certain hour section (, 3 days) according to background counting rate value between UF6 gas uranium abundance measurement mechanism gamma-rays region of interest is calculated described UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism.Especially, due to measured UF ₆gas is UF of the same race ₆gas, so n UF while carrying out measuring process S203 for n time ₆uranium Abundances E in gas ₁e _nequate.

That is, calculation procedure S204 calculates background counting rate value S between the gamma-rays region of interest remaining unchanged when execution flows step, described sealing step and the described measuring process n time according to formula (2) _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{P_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}---\left(2\right)$

In formula (2), background counting rate value S between the gamma-rays region of interest while all measuring for n time _b ¹, S _b ⁿequate.

That is, according to formula (2), can obtain as shown in the formula (3):

${S_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-P_n{T}_1}---\left(3\right)$

As can be seen here, according to formula (3), background counting rate value S between the gamma-rays region of interest in the time of can measuring in the hope of whole n time _b ¹, S _b ⁿ.And, can not need to know UF ₆the calibration factor K of gas uranium abundance measurement mechanism, background counting rate value S between the gamma-rays region of interest in the time of also can obtaining whole measurement for n time _b ¹, S _b ⁿ.

Due to UF ₆the calibration factor K of gas uranium abundance measurement mechanism, n time carry out gross-count rate value S between the gamma-rays region of interest that measuring process S203 measures ₁s _n, gaseous tension P ₁p _nwith gas temperature T ₁t _nknown, background counting rate value S between the gamma-rays region of interest in the time of therefore can obtaining whole measurement for n time _b ¹s _b ⁿ.In addition, even if do not know as seen from formula (2) UF ₆the calibration factor K of gas uranium abundance measurement mechanism, background counting rate value S between the gamma-rays region of interest in the time of also can obtaining whole measurement for n time _b ¹s _b ⁿ.

As example, can be for the UF shown in Fig. 1 ₆gas uranium abundance measurement mechanism is carried out according to definite UF of the present invention ₆the method of gas uranium abundance measurement mechanism background.When determining background, the UF shown in Fig. 1 ₆in whole valves of gas uranium abundance measurement mechanism, except second-hand's movable valve 2, the 3rd manually-operated gate 3, the 5th manually-operated gate 5 and the 6th manually-operated gate 6 are closed, remaining first-hand movable valve 1, the 4th manually-operated gate 4, the first solenoid valve 11 and the second solenoid valve 12 are opening.At definite UF of the present invention ₆when the method for gas uranium abundance measurement mechanism background starts, UF ₆gas, with from streamed inflow measuring vessel, is then closed the first solenoid valve 11 and the second solenoid valve 12 automatically.After gaseous tension is steady, automatically to the UF in device ₆gas is measured.Now, the UF in measuring vessel ₆uranium abundance in gas is determined by following formula.After flow step S201, sealing step S202, measuring process S203 and calculation procedure S204, automatically open the second solenoid valve 12 or the first solenoid valve 11, thereby allow UF in system ₆gas is closed after flowing out some or entering a part.And then measure so circulation.So just changed each measured UF ₆the amount of gas, and UF ₆uranium abundance in gas is constant.Like this, just can be according to calculating background counting rate value between gamma-rays region of interest with above formula (1) and (2).

In another example, except utilizing with background counting rate value between above formula (1) and (2) calculating gamma-rays region of interest, UF of the present invention ₆the method of gas uranium abundance measurement mechanism background can also be by the UF in measuring vessel ₆the temperature of gas remains in constant situation, by carrying out matching for gross-count rate value between n gamma-rays region of interest and n gas pressure value, obtains background counting rate value between gamma-rays region of interest.Particularly, between the gamma-rays region of interest when gas pressure value is 0, gross-count rate value is described UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism.

Fig. 3 shows according to definite UF of the present invention ₆the UF that the method for gas uranium abundance measurement mechanism background measures ₆gross-count rate value and force value curve map between the gamma-rays region of interest of gas.

In Fig. 3, horizontal ordinate is UF ₆gas pressure value in the measuring vessel of gas uranium abundance measurement mechanism, ordinate is UF ₆gross-count rate value between the gamma-rays region of interest of gas.As shown in Figure 3, ordinate is UF ₆between the gamma-rays region of interest of gas, gross-count rate value and gas pressure value are linear.Therefore,, by gross-count rate value and gas pressure value between gamma-rays region of interest are carried out to matching, the intercept when gaseous tension is 0 is the gamma-rays background counting rate between region of interest.That is, this value representation is not having UF ₆uF in the situation of gas ₆gamma-ray meter digit rate in the measuring vessel of gas uranium abundance measurement mechanism.

As another example, will determine UF ₆the method of gas uranium abundance measurement mechanism background is applied to the UF shown in Fig. 1 ₆the basic process of gas uranium abundance measurement mechanism is as follows:

1) first close the second solenoid valve 12, allow UF in measuring vessel ₆the pressure of gas raises, then closes the first solenoid valve 11, measures counting rate S between gamma-rays region of interest ₁with container inner pressure P ₁;

2) then, open the second solenoid valve 12 venting, the air pressure in measuring vessel is slightly reduced, close the second solenoid valve 12, measure counting rate S between gamma-rays region of interest ₂with container inner pressure P ₂;

3) so carry out repeatedly like this (as n time) circulation repeatedly, until that container inner pressure drops to is lower, thereby can obtain a series of S _nand P _n;

4) after n time is measured to S _nand P _ncarry out matching, can obtain counting rate S between n gamma-rays region of interest ₁s _nwith gaseous tension P ₁p _nmatched curve (see figure 3);

5) determine counting rate between the gamma-rays region of interest when intercept corresponds to P=0, i.e. background S _b.

Should be noted that above only description by the (UF that repeatedly exits ₆gas flows out) operation measures the situation of counting rate S and container inner pressure P between different gamma-rays region of interest, but the invention is not restricted to this.According to instructions, those skilled in the art can be by making UF ₆gas flows into or flows out measuring vessel measures to determine UF ₆the background of gas uranium abundance measurement mechanism.

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

Fig. 4 shows according to definite UF of the present invention ₆the equipment 400 of gas uranium abundance measurement mechanism background.

Shown in Fig. 4 according to definite UF of the present invention ₆the equipment 400 of gas uranium abundance measurement mechanism background comprises: flow module 401, this module makes same UF ₆the measuring vessel of gas inflow or eluting gas uranium abundance measurement device; Closed module 402, this module sealing measuring vessel, makes the UF in measuring vessel ₆gas stops flowing; Measurement module 403, the UF of this module in measuring vessel ₆the pressure of gas steadily after, measure UF ₆gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of gas; And computing module 404, at flow module, closed module and measurement module, repeat n operation to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, computing module utilizes gross-count rate value, a n gas pressure value and n gas temperature value between measured n gamma-rays region of interest to calculate UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism, wherein, n is more than or equal to 2 integer.

Shown in Fig. 4 according to definite UF of the present invention ₆in the equipment 400 of gas uranium abundance measurement mechanism background, computing module 404 utilizes formula (2) to calculate UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}---\left(1\right)$

In formula (1): E _nuF while carrying out the n time operation for measurement module ₆uranium abundance in gas; S _ngross-count rate value between the gamma-rays region of interest measuring while carrying out the n time operation for measurement module; S _b ⁿbackground counting rate value between the gamma-rays region of interest while carrying out the n time operation for measurement module; P _nthe gas pressure value measuring while carrying out the n time operation for measurement module; T _nthe gas temperature value measuring while carrying out the n time operation for measurement module; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

Be noted that E _nand S _b ⁿbe not the physical quantity that measurement module 403 measures, but measurement module 403 is being measured S _n, P _nand T _ntime the physical quantity that existed.In addition, according to the present invention, do not need the actual UF of obtaining ₆uranium abundance E in gas _n, and do not need to know UF ₆the calibration factor K of gas uranium abundance measurement mechanism, can be according to S _n, P _nand T _nobtain S _b ⁿ.

Shown in Fig. 4 according to definite UF of the present invention ₆in the equipment 400 of gas uranium abundance measurement mechanism background, computing module 404 is according to UF ₆the characteristic that between gas uranium abundance measurement mechanism gamma-rays region of interest, background counting rate value remains unchanged in certain hour section is calculated UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism.Especially, due to UF ₆gas is UF of the same race ₆gas, so n the UF of measurement module 403 while carrying out measuring for n time ₆uranium Abundances E in gas ₁e _nequate.

Be noted that E _nand S _b ⁿnot the physical quantity that processing module 403 measures, but the physical quantity having existed when processing module 403 is measured.In addition, according to the present invention, do not need the actual UF of obtaining ₆uranium abundance E in gas _n, can be according to S _n, P _nand T _nobtain S _b ⁿ.

Shown in Fig. 4 according to definite UF of the present invention ₆in the equipment 400 of gas uranium abundance measurement mechanism background, computing module 404 calculates background counting rate value S between the gamma-rays region of interest remaining unchanged when flow module, closed module and measurement module repeat n operation according to formula (2) _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}---\left(2\right)$

In formula (2), background counting rate value S between the gamma-rays region of interest while all measuring for n time _b ¹s _b ⁿequate.

That is, according to formula (2), can obtain as shown in the formula (3):

${{\mathrm{<figure-callout\; id="1"\; label="S\; B"\; filenames="HDA0000440573830000031.png"\; state="\{\{state\}\}">S</figure-callout>}}_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-P_n{T}_1}---\left(3\right)$

As can be seen here, according to formula (3), background counting rate value S between the gamma-rays region of interest in the time of can measuring in the hope of whole n time _b ¹, S _b ⁿ.And, can not need to know UF ₆the calibration factor K of gas uranium abundance measurement mechanism, background counting rate value S between the gamma-rays region of interest in the time of also can obtaining whole measurement for n time _b ¹, S _b ⁿ.

Shown in Fig. 4 according to definite UF of the present invention ₆in the equipment 400 of gas uranium abundance measurement mechanism background, the UF in measuring vessel ₆the temperature of gas remains in constant situation, and computing module 404 carries out matching for gross-count rate value between n gamma-rays region of interest and n gas pressure value.Especially, in the situation that carrying out matching, between the gamma-rays region of interest when gas pressure value is 0, gross-count rate value is UF ₆background counting rate value between the gamma-rays region of interest of gas uranium abundance measurement mechanism.

According to definite UF of the present invention ₆the equipment of gas uranium abundance measurement mechanism background is not limited to determine the UF shown in Fig. 1 ₆the background of gas uranium abundance measurement mechanism, but can be used for determining various UF ₆the background of gas uranium abundance measurement mechanism.

The present invention also provides a kind of and stores for carrying out according to definite UF of the present invention ₆the computer-readable recording medium of the instruction of the method 200 of gas uranium abundance measurement mechanism background.

By definite UF according to the present invention ₆the method of gas uranium abundance measurement mechanism background, can take multiple measurements to reduce the statistical error of measurement result, does not need manual operation, and convenient and swift, measuring error is little.After tested, result shows that the background precision of the method measurement is in 1% left and right, and it affects relative error not higher than 0.3% to abundance result.

And, according to definite UF of the present invention ₆the method and apparatus of gas uranium abundance measurement mechanism background need not be by UF ₆gas uranium abundance measurement mechanism and process pipe disconnect can fixed this UF of quick accurately geodetic ₆the background of gas uranium abundance measurement mechanism.This method is easy and simple to handle, expends time in short, does not need human intervention, and measuring error is little, conforms to uranic hexafluoride gas uranium abundance measurement device actual motion condition.

Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (14)

1. a method for definite uranic hexafluoride gas uranium abundance measurement device background, is characterized in that comprising the following steps:

Flow step, this step makes same uranic hexafluoride gas flow into or flow out the measuring vessel of described gas uranium abundance measurement mechanism;

Sealing step, this step is sealed described measuring vessel, makes the uranic hexafluoride gas in described measuring vessel stop flowing;

Measuring process, the pressure of the uranic hexafluoride gas of this step in described measuring vessel steadily after, measure gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of uranic hexafluoride gas; And

Calculation procedure, repeating described flow step, described sealing step and described measuring process n time to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, described calculation procedure utilizes gross-count rate value between measured n gamma-rays region of interest, a n gas pressure value and n gas temperature value to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device

Wherein, n is more than or equal to 2 integer.

2. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 1, it is characterized in that, described calculation procedure utilizes following formula to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}$

In the formula: E _nit is the uranium abundance in the described uranic hexafluoride gas while carrying out described measuring process the n time; S _nit is gross-count rate value between the gamma-rays region of interest measuring while carrying out described measuring process the n time; S _b ⁿit is background counting rate value between the gamma-rays region of interest while carrying out described measuring process the n time; P _nit is the gas pressure value measuring while carrying out described measuring process the n time; T _nit is the gas temperature value measuring while carrying out described measuring process the n time; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

3. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 2, it is characterized in that, described calculation procedure is calculated background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device according to the characteristic that between described uranic hexafluoride gas uranium abundance measurement device gamma-rays region of interest, background counting rate value remains unchanged in certain hour section

Wherein, because described uranic hexafluoride gas is uranic hexafluoride gas of the same race, so the uranium Abundances E in n uranic hexafluoride gas while carrying out described measuring process for n time ₁e _nequate.

4. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 3, it is characterized in that, described calculation procedure is calculated background counting rate value S between the gamma-rays region of interest remaining unchanged when carrying out described flow step, described sealing step and described measuring process n time according to following formula _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{P_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}.$

5. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 4, is characterized in that,

${S_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-P_n{T}_1}.$

6. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 1, it is characterized in that, in the situation that the temperature of the uranic hexafluoride gas in described measuring vessel remains is constant, described calculation procedure is carried out matching for gross-count rate value and a described n gas pressure value between described n gamma-rays region of interest.

7. the method for definite uranic hexafluoride gas uranium abundance measurement device background according to claim 6, it is characterized in that, in the situation that carrying out described matching, between the gamma-rays region of interest when described gas pressure value is 0, gross-count rate value is background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device.

8. an equipment for definite uranic hexafluoride gas uranium abundance measurement device background, is characterized in that comprising:

Flow module, this module makes same uranic hexafluoride gas flow into or flow out the measuring vessel of described gas uranium abundance measurement mechanism;

Closed module, this module is sealed described measuring vessel, makes the uranic hexafluoride gas in described measuring vessel stop flowing;

Measurement module, the pressure of the uranic hexafluoride gas of this module in described measuring vessel steadily after, measure gross-count rate value, gas pressure value and gas temperature value between the gamma-rays region of interest of uranic hexafluoride gas; And

Computing module, at described flow module, described closed module and described measurement module, repeat n operation to obtain gross-count rate value between n gamma-rays region of interest, a n gas pressure value and n gas temperature value in the situation that, described computing module utilizes gross-count rate value between measured n gamma-rays region of interest, a n gas pressure value and n gas temperature value to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device

Wherein, n is more than or equal to 2 integer.

9. the equipment of definite uranic hexafluoride gas uranium abundance measurement device background according to claim 8, it is characterized in that, described computing module utilizes following formula to calculate background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device:

$E_n=K\frac{(S_n-{S_B}^n)T_n}{P_n}$

In the formula: E _nuranium abundance in described uranic hexafluoride gas while carrying out the n time operation for described measurement module; S _ngross-count rate value between the gamma-rays region of interest measuring while carrying out the n time operation for described measurement module; S _b ⁿbackground counting rate value between the gamma-rays region of interest while carrying out the n time operation for described measurement module; P _nthe gas pressure value measuring while carrying out the n time operation for described measurement module; T _nthe gas temperature value measuring while carrying out the n time operation for described measurement module; And K is UF ₆the calibration factor of gas uranium abundance measurement mechanism.

10. the equipment of definite uranic hexafluoride gas uranium abundance measurement device background according to claim 9, it is characterized in that, described computing module calculates background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device according to the characteristic that between described uranic hexafluoride gas uranium abundance measurement device gamma-rays region of interest, background counting rate value remains unchanged in certain hour section

Wherein, because described uranic hexafluoride gas is uranic hexafluoride gas of the same race, the uranium Abundances E in n uranic hexafluoride gas when therefore described measurement module carries out n operation ₁e _nequate.

The equipment of 11. definite uranic hexafluoride gas uranium abundance measurement device backgrounds according to claim 10, it is characterized in that, described computing module calculates background counting rate value S between the gamma-rays region of interest remaining unchanged when described flow module, described closed module and described measurement module repeat n operation according to following formula _b ¹s _b ⁿ:

$K\frac{(S_1-{S_B}^1)T_1}{P_1}=...=K\frac{(S_n-{S_B}^n)T_n}{P_n}.$

The equipment of 12. definite uranic hexafluoride gas uranium abundance measurement device backgrounds according to claim 11, is characterized in that,

${S_B}^1={S_B}^n=\frac{P_1{S}_n{T}_n-P_n{S}_1{T}_1}{P_1{T}_n-P_n{T}_1}.$

The equipment of 13. definite uranic hexafluoride gas uranium abundance measurement device backgrounds according to claim 8, it is characterized in that, in the situation that the temperature of the uranic hexafluoride gas in described measuring vessel remains is constant, described computing module carries out matching for gross-count rate value and a described n gas pressure value between described n gamma-rays region of interest.

The equipment of 14. definite uranic hexafluoride gas uranium abundance measurement device backgrounds according to claim 13, it is characterized in that, in the situation that carrying out described matching, between the gamma-rays region of interest when described gas pressure value is 0, gross-count rate value is background counting rate value between the gamma-rays region of interest of described uranic hexafluoride gas uranium abundance measurement device.

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