CN112946717B - Portable radon exhalation rate and radon concentration reference device and reference constant value method - Google Patents
Portable radon exhalation rate and radon concentration reference device and reference constant value method Download PDFInfo
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- CN112946717B CN112946717B CN202110120282.9A CN202110120282A CN112946717B CN 112946717 B CN112946717 B CN 112946717B CN 202110120282 A CN202110120282 A CN 202110120282A CN 112946717 B CN112946717 B CN 112946717B
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- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
Abstract
The portable radon exhalation rate and radon concentration reference device comprises a base, a reference constant value unit, a radon source and a plurality of radon collection covers with different sizes, wherein a mounting hole is formed in the center of the top of each radon collection cover, the bottom end of a measuring cylinder of the reference constant value unit extends into the radon collection covers through the mounting holes, and the radon collection covers are provided with two interfaces respectively used for externally connecting an air inlet pipeline and an air return pipeline of a radon exhalation rate measuring instrument. Based on the portable radon exhalation rate and radon concentration reference device, radon exhalation rate and radon concentration conditions with different parameter values can be formed at any time and any place as required, and the reference constant value unit is ensured to be the same as a to-be-measured medium corresponding to a to-be-calibrated measuring instrument and the radon exhalation on the surface of the medium in the reference constant value process, so that the problem that the measuring accuracy is influenced due to sampling time delay is avoided, and a constant value reference standard can be more accurately and conveniently provided for the radon exhalation rate measuring instrument and the radon concentration measuring instrument.
Description
Technical Field
The invention relates to the technical field of nuclear radiation detection, in particular to a portable radon exhalation rate and radon concentration reference device and a reference value determining method.
Background
The radon exhalation rate on the surface of the medium refers to the radioactivity of radon exhaled from the surface of the medium per unit area and unit time, and the unit is Bq.m -2 .s -1 . The accumulation method is a commonly used method for measuring the radon exhalation rate, and the accumulation method reversely deduces the radon exhalation rate by measuring the radon exhalation rate separated within a period of time. When the radon exhalation rate is measured, three physical quantities of area, time and radon concentration are mainly measured, the area and the time are easy to measure accurately, and the accurate measurement of the radon concentration is the difficult point and the key of the measurement of the radon exhalation rate because the precipitation of the radon on the surface of the medium is uneven. The existing accumulation type radon measuring instrument has sampling delay and decay delay when measuring the radon concentration, so that the radon concentration which is measured and changed in the radon exhalation rate measuring process has a large delay effect, namely the measured radon concentration is inconsistent with the radon concentration at the actual moment, and the accuracy of the radon exhalation rate measuring result is influenced.
The radon exhalation rate measuring instrument and the radon concentration measuring instrument need to be checked (fixed value) when newly manufactured, used and maintained so as to ensure the working reliability. Because the radon concentration is obtained by back-estimating according to the concentration of radon daughters generated by radon decay, if the radon concentration at the same time is difficult to obtain accurately during measurement, the accurate calibration (fixed value) of the radon concentration and the radon exhalation rate can be influenced, and the fixed value of a conventional radon exhalation rate measuring instrument and a conventional radon concentration measuring instrument can be finished only by depending on a standard radon chamber. Chinese patent document CN108614289A discloses a synchronous constant value device of a radon exhalation rate measuring instrument, in which fig. 1 is a working principle diagram of the synchronous constant value device of the radon exhalation rate measuring instrument (the constant value device can use an interpolation method to obtain a real-time radon concentration under the condition that the radon concentration is equal to the radon concentration, so that the constant value device can also be used to set a value of the radon concentration measuring instrument, and the operation mode of setting the value of the radon concentration measuring instrument is similar to the constant value of the radon exhalation rate measuring instrument). In addition, when synchronous setting is performed by the setting device, the setting device needs to be connected in series with an intake or return air line of a measurement instrument to be set, and the setting method has the following defects: for example, the air flow needs to pass through the setting device and then flow into the measuring instrument to be set (or pass through the measuring instrument to be set and then flow into the setting device), and a certain delay exists between the two in sampling time, which affects the measurement precision. In addition, the circulation pump operation of the constant value device and the measurement instrument to be measured must be completely synchronous (the opening, the closing and the pumping speed are synchronous), otherwise the measurement accuracy is also influenced.
Disclosure of Invention
The invention aims to provide a radon exhalation rate and radon concentration reference device which can more accurately and conveniently provide a fixed value reference standard for a radon exhalation rate measuring instrument and a radon concentration measuring instrument.
In order to solve the technical problems, the invention adopts the following technical scheme: a portable radon exhalation rate and radon concentration reference device comprises a base, a reference constant value unit, a plurality of radon collection covers with different sizes and a plurality of radon sources with different specifications and models;
the base comprises a supporting platform, the upper surface of the supporting platform is provided with a circle of water-blocking inner edge protruding upwards, the inner side of the water-blocking inner edge is a radon source placing area for placing a radon source, the outer side of the water-blocking inner edge is also provided with a circle of water-blocking outer edge protruding upwards, and the water-blocking outer edge and the water-blocking inner edge are spaced at a certain distance, so that a water injection groove is formed between the water-blocking outer edge and the water-blocking inner edge;
the radon collection cover is characterized in that mounting holes are formed in the center of the top of the radon collection cover, the wall thickness of the radon collection cover is smaller than the width of a water injection tank so as to ensure that the bottom end of the radon collection cover can be buckled in the water injection tank, the reference constant value unit comprises an insulating shell, a measuring cylinder, a semiconductor detector, a high-voltage module and a signal and data processing module, the bottom end of the insulating shell is open, the measuring cylinder is embedded in the insulating shell and extends out of the bottom end of the insulating shell, the bottom end of the measuring cylinder penetrates through the mounting holes and extends into an inner cavity of the radon collection cover, the insulating shell is fixedly connected with the radon collection cover, and two interfaces respectively used for externally connecting an air inlet pipeline and an air return pipeline of a radon concentration measuring instrument or a radon exhalation rate measuring instrument are arranged on the radon collection cover;
the measuring cylinder is of a hollow structure, air inlets are formed in the bottom of the measuring cylinder and the bottom of the side wall of the measuring cylinder, a conductive silver adhesive layer is coated on the inner side wall of the measuring cylinder and the inner surface of the bottom of the measuring cylinder, the semiconductor detector is located at the top of the measuring cylinder, and the high-voltage module is electrically connected with the conductive silver adhesive layer, so that a gap is formed between the conductive silver adhesive layer and the semiconductor detector 218 The method comprises the steps that Po is adsorbed to an electrostatic field on the surface of a semiconductor detector, the semiconductor detector is connected with a signal and data processing module, the signal and data processing module processes an electric signal formed by the semiconductor detector and performs equivalence on the changed radon concentration by using an interpolation method to obtain a radon concentration value and a radon precipitation rate value, and the radon concentration value and the radon precipitation rate value calculated by the signal and data processing module are used as reference standards of fixed values of a radon concentration measuring instrument and a radon precipitation rate measuring instrument.
Wherein, the top of the water retaining inner edge is higher than the top of the water retaining outer edge.
Wherein, the bottom of the measuring cylinder is spherical crown-shaped.
In addition, above-mentioned radon exhalation rate and radon concentration reference device still includes the trachea that is used for external radon concentration measuring apparatu or radon exhalation rate measuring apparatu's air inlet pipeline and return air pipe way, tracheal one end is equipped with and is used for dismantling the adapter of being connected with the interface.
The bottom end of the insulating shell is provided with an external thread, and the insulating shell is connected with the radon collecting cover through the thread.
On the other hand, the invention also relates to a reference value setting method of the radon exhalation rate, in particular to a method for setting a value of a radon exhalation rate measuring instrument to be calibrated by adopting the portable radon exhalation rate and radon concentration reference device, which comprises the following steps:
selecting a radon collection cover with a proper size, and correspondingly connecting an air inlet pipeline and an air return pipeline of the radon exhalation rate measuring instrument with two interfaces of the radon collection cover respectively;
secondly, selecting a radon source with a proper specification and model to be placed in a radon source placing area, buckling the bottom end of the radon collection cover in a water injection groove after environment background measurement is finished, so that the radon source placed in the radon source placing area is covered by the radon collection cover, injecting water into the water injection groove to seal the contact part of the bottom end of the radon collection cover and the water injection groove, and then collecting radon;
and step three, simultaneously measuring the radon exhalation rate value on the surface of the medium by using the reference constant value unit and the radon exhalation rate measuring instrument, and setting the value of the radon exhalation rate measuring instrument by using the radon exhalation rate value measured by the reference constant value unit as a reference standard.
In addition, the invention also relates to a radon concentration reference value determining method, in particular to a method for determining the value of a radon concentration measuring instrument to be calibrated by adopting the portable radon exhalation rate and radon concentration reference device, which comprises the following steps:
selecting a radon collection cover with a proper size, and correspondingly connecting an air inlet pipeline and an air return pipeline of the radon concentration measuring instrument with two interfaces of the radon collection cover respectively;
secondly, selecting a radon source with a proper specification and model to be placed in a radon source placing area, buckling the bottom end of the radon collection cover in a water injection groove after environment background measurement is finished, so that the radon source placed in the radon source placing area is covered by the radon collection cover, injecting water into the water injection groove to seal the contact part of the bottom end of the radon collection cover and the water injection groove, and then collecting radon;
and step three, continuously measuring the radon concentration in the radon collection cover by using the reference constant value unit, and after the measurement result of the reference constant value unit shows that the radon in the radon collection cover reaches a dynamic balance state, setting the radon concentration value measured by the reference constant value unit as a reference standard for a radon concentration measuring instrument to be constant value.
Above-mentioned portable radon exhalation rate and radon concentration reference device is through setting up the base of placing the radon source, multiple not unidimensional and with base matched with collection radon cover, can form the radon exhalation rate and the radon concentration condition of different parameter values anytime and anywhere as required. In addition, the reference constant value unit in the reference device is directly fixed on the radon collection cover for sampling, and an interface for connecting an air inlet pipeline and an air return pipeline of a radon exhalation rate measuring instrument or a radon concentration measuring instrument to be calibrated is arranged on the radon collection cover, so that when the radon exhalation rate measuring instrument and the radon concentration measuring instrument are set, the measuring instrument and the reference constant value unit are independent from each other and directly sample radon-containing air in the radon collection cover, the measuring instrument and the reference constant value unit are completely the same as a medium to be measured, the radon exhalation rate on the surface of the medium is the same as the radon exhalation rate in the environment of the medium to be measured, and the problem that the measuring instrument and the reference constant value unit delay in sampling time and the operation of a circulating pump is not completely synchronous to influence the measuring accuracy is solved. After the radon collection cover is buckled on the base and sealed by water, when the radon concentration in the radon collection cover reaches an equilibrium state, the reference constant value unit can provide accurate radon concentration reference data for the measuring instrument, and then the measuring instrument to be calibrated is set. Compared with a standard radon chamber, the reference device provided by the invention is small in size, convenient to carry and use. Compared with the synchronous customization device of the radon exhalation rate measuring instrument in the background technology, the reference device provided by the invention can provide radon exhalation rates and radon concentration conditions with different parameters at any time and any place according to needs, and avoids the problem that the measurement accuracy is influenced due to delay in sampling time and incomplete synchronization of the operation of a circulating pump through the change of the whole structure of the device and the sampling mode. In conclusion, the reference device provided by the invention can more accurately and conveniently provide a fixed value reference standard for the radon exhalation rate measuring instrument and the radon concentration measuring instrument.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a portable radon exhalation rate and radon concentration reference device involved in the present invention;
FIG. 2 is a schematic diagram of a reference constant value unit;
fig. 3 is a schematic structural diagram of the base.
In the figure:
1-base 2-reference constant value unit 3-radon source
4-radon collecting cover 1 a-bearing platform 1 b-water retaining inner edge
1 c-water retaining outer edge 1 d-water injection groove 2 a-insulating shell
2 b-measuring cylinder 2 c-semiconductor detector 4 a-interface
2b 1-inlet port.
Detailed Description
In order to facilitate a better understanding of the invention with respect to the improvements made in the prior art by those skilled in the art, the invention is further described below with reference to the accompanying drawings and examples.
Fig. 1 shows the overall structure of the portable radon exhalation rate and radon concentration reference device related to the present invention, and the portable radon exhalation rate and radon concentration reference device shown in the figure comprises a base 1, a reference fixed value unit 2, a radon source 3 and a plurality of radon collection covers 4 (only one radon collection cover 4 is shown in the figure) which have different sizes and can be replaced according to needs.
See fig. 3 and show, base 1 includes bearing platform 1a, and bearing platform 1 a's upper surface is equipped with in the round upwards bellied manger plate along 1b, and along 1b inboard in the manger plate and place the district for the radon source that is used for placing radon source 4, still is equipped with in the manger plate along 1 b's the outside and goes up bellied manger plate of round outer along 1c, and one section distance along 1b in manger plate outer edge 1c and the manger plate to form water injection tank 1d between the two.
The top center of the radon collection cover 4 is provided with mounting holes, the wall thickness of the radon collection cover 4 is smaller than the width of the water injection tank 1d, so that the bottom end of the radon collection cover 4 can be buckled in the water injection tank 1d, the reference constant value unit 2 comprises an insulating shell 2a, a measuring cylinder 2b, a semiconductor detector 2c, a high-voltage module, a signal and data processing module, the bottom end of the insulating shell 2a is open, the measuring cylinder 2b is embedded in the insulating shell 2a and extends out of the bottom end of the insulating shell, the bottom end of the measuring cylinder 2b penetrates through the mounting holes and extends into the inner cavity of the radon collection cover 4, the insulating shell 2a is fixedly connected with the radon collection cover 4, and the radon collection cover 4 is provided with two interfaces 4a which are respectively used for externally connecting a radon concentration measuring instrument or a radon exhalation rate measuring instrument air inlet pipeline and an air return pipeline.
Wherein, measuring section of thick bamboo 2b is hollow structure, has all seted up inlet port 2b1 at measuring section of thick bamboo 2 b's bobbin base and lateral wall bottom, and measuring section of thick bamboo 2 b's inside wall and bobbin base inboard surface coating have one deck conductive silver glue film, and semiconductor detector 2c is located measuring section of thick bamboo 2 b's top, high-voltage module and conductive silver glue film electric connection to form between conductive silver glue film and semiconductor detector 2c and will be with conductive silver glue film electric connection 218 Po is adsorbed to the electrostatic field on the surface of the semiconductor detector 2c, and the semiconductor detector 2c is connected with a signal and data processing module. The radon released by the radon source 4 enters the inner cavity of the measuring cylinder 2b, and a first generation daughter generated by decay of the radon 218 Po is adsorbed to the surface of the semiconductor detector 2c under the action of an electrostatic field to form an electric signal, the electric signal formed by the semiconductor detector 2c is processed by the signal and data processing module, and the changed radon concentration is equivalent by using an interpolation method (the equivalent of the changed radon concentration by using the interpolation method belongs to the prior art and is not described herein), so that a radon concentration value and a radon precipitation rate value are obtained, and the radon concentration value and the radon precipitation rate value calculated by the signal and data processing module are used as reference standards of a radon concentration measuring instrument and a radon precipitation rate measuring instrument set value.
Further, in the above-mentioned portable radon exhalation rate and radon concentration reference device, as shown in fig. 3, the top end of the water blocking inner edge 1b is higher than the top end of the water blocking outer edge 1c, so that even if water is injected into the water injection tank too much, water overflows from the water blocking outer edge 1c and does not flow into the radon source placement area. In addition, as a preferable configuration, the bottom of the measuring cylinder 2b is preferably formed in a spherical crown shape. In addition, the portable radon exhalation rate and radon concentration reference device further comprises an air pipe (the air pipe is not shown in the attached drawings) for externally connecting an air inlet pipeline and an air return pipeline of the radon exhalation rate measuring instrument or the radon exhalation rate measuring instrument, and one end of the air pipe is provided with an adapter for being detachably connected with the interface 4a. Finally, the inner wall surface of the installation hole of the radon collection cover 4 is provided with an internal thread, and the bottom end of the insulating shell 2a is provided with an external thread, so that the insulating shell 2a and the radon collection cover 4 can be detachably connected through the threads.
When the reference device for radon exhalation rate and radon concentration is used for setting a value of a measuring instrument for radon exhalation rate to be calibrated, firstly, selecting a radon collection cover 4 with a proper size, then, correspondingly connecting an air inlet pipeline and an air return pipeline of the measuring instrument for radon exhalation rate with two interfaces 4a of the radon collection cover 4 respectively, placing a radon source 3 in a radon source placement area, after the environmental background measurement is completed, buckling the bottom end of the radon collection cover 4 in a water injection groove 1d of a base 1, injecting water into the water injection groove 1d, sealing the contact part between the bottom end of the radon collection cover 4 and the water injection groove 1d, then, collecting radon, simultaneously measuring a medium surface radon exhalation rate value by a reference setting value unit 2 and the measuring instrument for radon exhalation rate, and finally, setting the value of the measuring instrument for radon exhalation rate by taking the radon exhalation rate value measured by the reference setting value unit 2 as a reference standard.
When the portable radon exhalation rate and radon concentration reference device is used for carrying out value setting on a radon concentration measuring instrument to be calibrated, firstly, a radon collection cover 4 with a proper size is selected, then an air inlet pipeline and an air return pipeline of the radon concentration measuring instrument are respectively and correspondingly connected with two interfaces 4a of the radon collection cover 4, a radon source 3 is placed in a radon source placing area, the bottom end of the radon collection cover 4 is buckled in a water injection groove 1d after environment background measurement is completed, so that the radon source 3 placed in the radon source placing area is covered by the radon collection cover 4, then, water is injected into the water injection groove 1d to seal the contact part of the bottom end of the radon collection cover 4 and the water injection groove 1d, and then radon collection is started. The radon concentration measuring instrument which can rapidly measure the radon concentration as the reference constant value unit 2 can synchronously set the value of the radon concentration measuring instrument by taking the radon concentration measured in real time by the reference constant value unit 2 as a reference standard in the radon collection process, and for the radon concentration measuring instrument which can measure the radon by an accumulation method and cannot rapidly measure the radon concentration in real time, the radon concentration measuring instrument needs to set the value of the radon concentration measuring instrument by taking the radon concentration value measured by the reference constant value unit 2 as the reference standard after the measurement result of the reference constant value unit 2 shows that the radon in the radon collection cover 4 reaches a dynamic equilibrium state.
In the radon collecting process, the change of the radon concentration in the radon collecting cover is firstly the radon accumulation increasing process, and the radon in the radon collecting cover tends to be in dynamic balance after the radon is accumulated for a certain time. The change in radon concentration in the radon collection enclosure can be described by equation (1):
in the above formula, the first and second carbon atoms are,
the change of radon concentration caused by the radon separated out into the radon collecting cover in unit time; j is the exhalation rate of radon on the surface of the measured medium, V is the effective volume V of the radon collecting cover, and lambda is the decay constant of radon (2.1X 10) -6 s -1 ) (ii) a R is the leakage and the counter-diffusion rate of radon, and t is the radon collecting time.
Let lambda be e = λ + R; the radon concentration is C (t), namely the radon concentration in the radon collection cover is C (t = 0), and the radon concentration in the radon collection cover is C 0 The solution of the formula (1) is
And (3) continuously measuring with the time interval of T, wherein the change of radon concentration in the radon collecting cover measured twice adjacently is in the following relation:
order to
Then there are:
C n ＝A+BC n-1 (4)；
(1) And (3) radon accumulation and growth process:
radon accumulation Process, i.e. in formula (2)
In order to improve the measurement accuracy, a and B are calculated by a least square method through multiple measurements, and J and lambda are finally obtained e 。
(2) Radon tends to be in dynamic equilibrium:
radon dynamic equilibrium process, i.e. in formula (2)
When the temperature of the water is higher than the set temperature,
under normal conditions, the J measured by the portable radon exhalation rate and radon concentration reference device is a constant value which is equal to the radon production rate P of the radon source 3 Rn (for a standard radon source, its radon production rate P Rn Constant) is related to the bottom area S of the radon collection cage 4, J = P Rn (S), if the radon source 3 is polluted or the portable radon exhalation rate and radon concentration reference device measures the J value and the P value due to other factors Rn And in the case of inconsistency of the calculated values of/S, taking the portable radon exhalation rate and J measured by the radon concentration reference device as a reference standard.
Different from the prior art, firstly, the portable radon exhalation rate and radon concentration reference device can form radon exhalation rates and radon concentration conditions with different parameter values as required at any time and any place by arranging the base 1 for placing the radon source 3, and the multiple radon collection covers 4 with different sizes and matched with the base 1. Secondly, the reference constant value unit 2 in the reference device is directly fixed on the radon collection cover 4 for sampling, and the radon collection cover 4 is provided with an interface 4a for connecting an air inlet pipeline and an air return pipeline of a radon exhalation rate measuring instrument or a radon concentration measuring instrument to be calibrated, so that when the radon exhalation rate measuring instrument and the radon concentration measuring instrument are set, the measuring instrument and the reference constant value unit 2 are independent from each other and directly sample radon-containing air in the radon collection cover 4, the measuring instrument and the reference constant value unit 2 have the same medium to be measured, the radon exhalation rate on the surface of the medium and the radon concentration in the environment of the medium to be measured, and the problems that the measuring instrument and the reference constant value unit 2 have delay in sampling time and the operation of a circulating pump is not completely synchronous to influence the measuring accuracy are solved. After the radon collection cover 4 is buckled on the base 1 and sealed by water, when the radon concentration in the radon collection cover 4 reaches an equilibrium state, the reference constant value unit can provide accurate radon concentration reference data for the measuring instrument, and then the measuring instrument to be calibrated is set. Compared with a standard radon chamber, the reference device is small in size, convenient to carry and use. Compared with the synchronous customization device of the radon exhalation rate measuring instrument in the prior art, the reference device can provide radon exhalation rates and radon concentration conditions with different parameters at any time and any place according to needs, and the problem that the measurement accuracy is influenced due to delay in sampling time and incomplete synchronization of the operation of a circulating pump is avoided through the change of the whole structure of the device and the sampling mode. In summary, the portable radon exhalation rate and radon concentration reference device can more accurately and conveniently provide a fixed value reference standard for the radon exhalation rate measuring instrument and the radon concentration measuring instrument and be used for fixed values of the radon exhalation rate measuring instrument and the radon concentration measuring instrument.
The above embodiments are preferred implementations of the present invention, and besides, the present invention can be implemented in other ways, and any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.
Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.
Claims (4)
1. The radon exhalation rate reference value setting method is characterized in that a portable radon exhalation rate and radon concentration reference device is adopted to set a value of a to-be-calibrated radon exhalation rate measuring instrument, and the portable radon exhalation rate and radon concentration reference device comprises a base (1), a reference value setting unit (2), a radon source (3) and a plurality of radon collection covers (4) which can be replaced according to needs and have different sizes;
the base (1) comprises a bearing platform (1 a), the upper surface of the bearing platform (1 a) is provided with a circle of water-blocking inner edge (1 b) protruding upwards, the inner side of the water-blocking inner edge (1 b) is a radon source placing area for placing a radon source (4), the outer side of the water-blocking inner edge (1 b) is further provided with a circle of water-blocking outer edge (1 c) protruding upwards, the top end of the water-blocking inner edge (1 b) is higher than the top end of the water-blocking outer edge (1 c), and the water-blocking outer edge (1 c) and the water-blocking inner edge (1 b) are separated by a certain distance, so that a water injection groove (1 d) is formed between the water-blocking inner edge and the water-blocking outer edge (1 c);
the radon collection device is characterized in that mounting holes are formed in the center of the top of the radon collection cover (4), the wall thickness of the radon collection cover (4) is smaller than the width of a water injection groove (1 d) to ensure that the bottom end of the radon collection cover (4) can be buckled in the water injection groove (1 d), the reference constant value unit (2) comprises an insulating shell (2 a), a measuring cylinder (2 b), a semiconductor detector (2 c), a high-voltage module and a signal and data processing module, the bottom end of the insulating shell (2 a) is open, the measuring cylinder (2 b) is embedded in the insulating shell (2 a) and extends out of the bottom end of the insulating shell, the bottom end of the measuring cylinder (2 b) penetrates through the mounting holes and extends into the inner cavity of the radon collection cover (4), the insulating shell (2 a) is fixedly connected with the radon collection cover (4), and two connectors (4 a) for respectively externally connecting a radon concentration measuring instrument or a radon exhalation measuring instrument pipeline and a radon return pipeline are arranged on the radon collection cover (4);
measure section of thick bamboo (2 b) and be hollow structure measure the barrel bottom and the lateral wall bottom of barrel (2 b) and all seted up inlet port (2 b 1), the inside wall of measuring barrel (2 b) and the inboard surface coating in barrel bottom have one deck conductive silver glue film, semiconductor detector (2 c) are located the top of measuring barrel (2 b), high-voltage module and conductive silver glue film electric connection, thereby form between conductive silver glue film and semiconductor detector (2 c) and will be with conductive silver glue film and semiconductor detector (2 c) 218 Po is adsorbed to an electrostatic field on the surface of the semiconductor detector (2 c), the semiconductor detector (2 c) is connected with a signal and data processing module, the signal and data processing module processes an electric signal formed by the semiconductor detector (2 c) and performs equivalence on the changed radon concentration by using an interpolation method, so that a radon precipitation value is obtained;
the process of carrying out value setting on the radon exhalation rate measuring instrument to be calibrated comprises the following steps:
step one, selecting a radon collection cover (4) with a proper size, and correspondingly connecting an air inlet pipeline and an air return pipeline of the radon exhalation rate measuring instrument with two interfaces (4 a) of the radon collection cover (4) respectively;
step two, placing a radon source (3) in a radon source placing area, after the environmental background measurement is finished, buckling the bottom end of the radon collection cover (4) in a water injection groove (1 d) so that the radon source (3) placed in the radon source placing area is covered by the radon collection cover (4), injecting water into the water injection groove (1 d) to seal the contact part of the bottom end of the radon collection cover (4) and the water injection groove (1 d), and then collecting radon;
and step three, simultaneously measuring the radon precipitation rate value on the surface of the medium by using the reference constant value unit (2) and the radon precipitation rate measuring instrument, and determining the value of the radon precipitation rate measuring instrument by taking the radon precipitation rate value measured by the reference constant value unit (2) as a reference standard.
2. The radon exhalation rate reference definite value method as set forth in claim 1, wherein: in the portable radon exhalation rate and radon concentration reference device, the bottom of the measuring cylinder (2 b) is in a spherical crown shape.
3. The radon exhalation rate reference definite value method as set forth in claim 1, wherein: among portable radon exhalation rate and radon concentration reference device, still including the trachea that is used for external radon concentration measuring apparatu or radon exhalation rate measuring apparatu's air inlet pipeline and muffler way, tracheal one end is equipped with and is used for dismantling the adapter of being connected with interface (4 a).
4. The radon exhalation rate reference definite value method as set forth in claim 1, wherein: in portable radon exhalation rate and radon concentration reference device, be equipped with the internal thread on the mounting hole inner wall face of collection radon cover (4), the bottom of insulating casing (2 a) is equipped with the external screw thread, insulating casing (2 a) pass through threaded connection with collection radon cover (4).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363089A (en) * | 2018-02-07 | 2018-08-03 | 衡阳师范学院 | The quick valued methods of precipitation rate of radon and device |
| CN108614289A (en) * | 2018-06-01 | 2018-10-02 | 衡阳师范学院 | Radon Exhalation Rate Measuring Apparatus synchronizes gauge device and method |
| CN108646286A (en) * | 2018-06-01 | 2018-10-12 | 衡阳师范学院 | A kind of reference unit and method of continuous reliable regulation and control precipitation rate of radon |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363089A (en) * | 2018-02-07 | 2018-08-03 | 衡阳师范学院 | The quick valued methods of precipitation rate of radon and device |
| CN108614289A (en) * | 2018-06-01 | 2018-10-02 | 衡阳师范学院 | Radon Exhalation Rate Measuring Apparatus synchronizes gauge device and method |
| CN108646286A (en) * | 2018-06-01 | 2018-10-12 | 衡阳师范学院 | A kind of reference unit and method of continuous reliable regulation and control precipitation rate of radon |
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