CN117214205A - System and method for testing efficiency of radioactive iodine protective mask - Google Patents
System and method for testing efficiency of radioactive iodine protective mask Download PDFInfo
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- CN117214205A CN117214205A CN202310975756.7A CN202310975756A CN117214205A CN 117214205 A CN117214205 A CN 117214205A CN 202310975756 A CN202310975756 A CN 202310975756A CN 117214205 A CN117214205 A CN 117214205A
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- radioactive iodine
- protective mask
- efficiency
- radioiodine
- radioactivity
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- 230000002285 radioactive effect Effects 0.000 title claims abstract description 140
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 130
- 239000011630 iodine Substances 0.000 title claims abstract description 130
- 230000001681 protective effect Effects 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 44
- 238000002474 experimental method Methods 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- XMBWDFGMSWQBCA-RNFDNDRNSA-M iodine-131(1-) Chemical compound [131I-] XMBWDFGMSWQBCA-RNFDNDRNSA-M 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims abstract description 18
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 18
- 238000010998 test method Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000001685 thyroid gland Anatomy 0.000 description 1
Abstract
The invention relates to a system and a method for testing the efficiency of a radioactive iodine protective mask, which are sequentially connected with a radioactive iodine injection device, an experiment box body, a vacuum pump, a first flowmeter and a sampling clamp through pipelines to build the system; the radioactive iodine injection device comprises a radioactive iodine storage bottle, a gas flow control valve and an air filter; installing a radioactive iodine protective mask to be tested on a radioactive iodine protective mask placing position in an experiment box body, starting a vacuum pump, adjusting a first flow meter, and adjusting the flow of the system to be a set flow; injecting radioactive iodine into the experiment box body, and adjusting the injection flow of the radioactive iodine; after stopping injecting the radioactive iodine, closing the vacuum pump, taking down the radioactive iodine protective mask to be tested and the sampling clamp, and respectively testing the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp; the filtration efficiency of the radioiodine protective mask to be tested can be determined.
Description
Technical Field
The invention belongs to the technical field of nuclear industry, and particularly relates to a system and a method for testing efficiency of a radioactive iodine protective mask.
Background
In the radioactive fission products of nuclear facilities, gaseous radioactive iodine is mainly expressed as molecular iodine @ 129 I 2 、 131 I 2 ) And organic iodine (CH) 3 131 I, etc.), although the concentration of radioactive iodine is very low, the radioactive iodine is very harmful to human health after release due to the high absorption capacity of human thyroid. Thus, in environments where radioactive materials may be present, workers should wear radioiodine masks to avoid serious internal irradiation injuries.
Qualified radioactive iodine protective mask is an important precondition for personnel safety, and is mainly used for removing radioactive iodine through physical and chemical adsorption by an adsorption material filled in the mask, and meanwhile, the mask needs to be subjected to overall efficiency test in consideration of possible mechanical leakage of the whole mask. The existing traditional protective mask performance testing device has the following problems: 1. the traditional testing device can not effectively test the performance of radioactive iodine; 2. at present, the testing device usually performs mask protection time test, and for the radioactive iodine protective mask, the experiment time should be reduced as much as possible, and the radioactive hazard should be reduced; 3. all the existing analysis methods (gas absorption method, weight method and the like) have the problems of complex test and larger deviation.
In the practical application scene, the concentration of radioactive iodine is lower and a large amount of radioactivity exists, so that a more effective and accurate efficiency test method needs to be developed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for testing the efficiency of a radioactive iodine protective mask, which simulate the use condition of the mask in an actual application scene by injecting trace radioactive iodine and adsorbing the protective mask, and accurately and rapidly test and evaluate the filtering efficiency of the mask by a gamma spectrometer.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a radioactive iodine protective mask efficiency test's system, the system mainly includes radioactive iodine injection device, experiment box, vacuum pump, first flowmeter, the sampling clamp that connects gradually through the pipeline, wherein:
the radioactive iodine injection device comprises a radioactive iodine storage bottle, a gas flow control valve and an air filter; the first inlet of the gas flow control valve is connected with the radioactive iodine storage bottle, the second inlet of the gas flow control valve is connected with the outlet of the air filter, and the outlet of the gas flow control valve is connected with the injection port of the experiment box body; the inlet of the air filter is communicated with the atmosphere;
the radioactive iodine protective mask placing position is arranged in the experiment box body and is used for installing the radioactive iodine protective mask to be detected;
and an outlet of the sampling clamp is connected with the tail gas treatment unit.
Further, a second flowmeter is installed on a connecting pipeline between the radioactive iodine storage bottle and the first inlet of the gas flow control valve.
The invention also provides a method for testing the efficiency of the radioactive iodine protective mask, which is realized based on the system for testing the efficiency of the radioactive iodine protective mask and comprises the following steps:
s1, constructing a system for testing the efficiency of the radioactive iodine protective mask: the radioactive iodine mask to be detected is arranged on a radioactive iodine mask placing position in the experiment box body through a pipeline sequentially connected with the radioactive iodine injection device, the experiment box body, the vacuum pump, the first flowmeter and the sampling clamp;
s2, starting a vacuum pump, and determining that the experiment box body is in a negative pressure state; adjusting a first flowmeter to adjust the flow of the system to a set flow;
s3, injecting radioactive iodine into the experiment box body, and adjusting the injection flow of the radioactive iodine;
s4, after stopping injecting the radioactive iodine, closing the vacuum pump, taking down the radioactive iodine protective mask to be tested and the sampling clamp, and respectively testing the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp;
s5, determining the filtering efficiency of the radioactive iodine protective mask to be detected.
Further, the step S2 further includes the following steps: and measuring the temperature and the humidity of the experiment box body, and keeping the temperature and the humidity balance of the experiment box body.
Further, in step S3, the radioiodine is radioiodine.
Further, in step S3, the injection flow rate of radioactive iodine and the concentration of radioactive iodine in the experimental box are controlled by adjusting the opening of the first inlet of the gas flow control valve, the first flow meter, the second flow meter; while controlling the injection time of radioactive iodine.
Further, the concentration of radioactive iodine in the experimental box body is controlled to be 1-2.5 mg/L.
Further, in step S4, the radioactivity of the radioiodine mask to be tested and the radioactivity of the sampling clip are respectively tested by a gamma spectrometer.
Further, before the step S5, the method further includes the following steps: the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp which are not tested are respectively tested, and the measured result is used as the radioactivity background activity of the corresponding radioactive iodine protective mask to be tested and the radioactivity background activity of the sampling clamp;
the radioactivity background activity of the radioactive iodine protective mask to be detected is subtracted from the radioactivity activity of the radioactive iodine protective mask to be detected, so that the net counting rate of the radioactive iodine protective mask to be detected is obtained; and subtracting the radioactivity background activity of the sampling clamp from the radioactivity activity of the sampling clamp to obtain the net count rate of the sampling clamp.
Further, in step S5, the filtering efficiency of the radioiodine mask to be detected is calculated according to a filtering efficiency formula, where the filtering efficiency formula is:
wherein, A-net count rate of the radioactive iodine protective mask to be detected, CPM;
b-the net count rate of the sampling clip, CPM.
The beneficial effects of the invention are as follows: by adopting the system and the method for testing the efficiency of the radioactive iodine protective mask, provided by the invention, the radioactive iodine injection device, the experiment box body, the vacuum pump, the first flowmeter and the sampling clamp are sequentially connected through the pipeline so as to build the system; the radioactive iodine injection device comprises a radioactive iodine storage bottle, a gas flow control valve and an air filter; installing a radioactive iodine protective mask to be tested on a radioactive iodine protective mask placing position in an experiment box body, starting a vacuum pump, adjusting a first flow meter, and adjusting the flow of the system to be a set flow; injecting radioactive iodine into the experiment box body, and adjusting the injection flow of the radioactive iodine; after stopping injecting the radioactive iodine, closing the vacuum pump, taking down the radioactive iodine protective mask to be tested and the sampling clamp, and respectively testing the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp; the filtration efficiency of the radioiodine protective mask to be tested can be determined. The system and the method provided by the invention can simulate the actual use condition of the radioactive iodine protective mask for absorbing and filtering trace radioactive iodine in an actual application scene by installing the radioactive iodine protective mask to be detected in an experiment box body, arranging the sampling clamp in front of the tail gas treatment unit and injecting trace radioactive iodine into the experiment box body, and accurately and rapidly test and evaluate the filtering efficiency of the radioactive iodine protective mask by a gamma spectrometer.
Drawings
FIG. 1 is a schematic diagram of a system for testing the efficiency of a radioiodine mask according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for testing the efficiency of a radioiodine protective mask according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other examples obtained by those skilled in the art without making any inventive effort based on the examples in the present invention are within the scope of protection of the present invention.
It should be noted that, in the description of the embodiments of the present invention, terms such as "upper", "lower", "front", "rear", "front", "back", "left", "right", "horizontal", "vertical", "inner", "outer", and the like indicate orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the system for testing efficiency of a radioiodine protective mask according to the embodiment of the present invention mainly includes a radioiodine injection device, an experiment box, a vacuum pump, a first flowmeter, and a sampling clamp, which are sequentially connected through a pipeline, wherein:
the radioactive iodine injection device comprises a radioactive iodine storage bottle, a gas flow control valve and an air filter; the first inlet of the gas flow control valve is connected with the radioactive iodine storage bottle, the second inlet of the gas flow control valve is connected with the outlet of the air filter, and the inlet of the air filter is communicated with the atmosphere; the outlet of the gas flow control valve is connected with the injection port of the experimental box body;
the radioactive iodine protective mask placing position is arranged in the experiment box body, and the radioactive iodine protective mask to be detected is arranged on the radioactive iodine protective mask placing position before an experiment is carried out;
and an outlet of the sampling clamp is connected with the tail gas treatment unit, and a new sampling clamp is installed before each test.
Specifically, a second flowmeter is installed on a connecting pipeline between the radioactive iodine storage bottle and the first inlet of the gas flow control valve, and the connecting pipeline can be used for controlling and adjusting the injection flow of the radioactive iodine injected into the experimental box body so as to realize the injection of trace radioactive iodine into the experimental box body and simulate the actual application scene of the radioactive iodine protective mask.
In the process of testing the efficiency of the radioactive iodine protective mask, the second inlet of the gas flow control valve is in a normally open state; according to the concentration of the standard radioactive iodine in the radioactive iodine storage bottle, controlling the flow of the radioactive iodine injected into the experiment box body and the concentration of the radioactive iodine in the experiment box body by adjusting the opening degree of the first inlet of the gas flow control valve, the first flow meter and the second flow meter.
The embodiment also provides a method for testing the efficiency of the radioactive iodine protective mask, which adopts the system for testing the efficiency of the radioactive iodine protective mask to carry out measurement and comprises the following steps:
s1, constructing a system for testing the efficiency of the radioactive iodine protective mask: the radioactive iodine mask to be detected is arranged on a radioactive iodine mask placing position in the experiment box body through a pipeline sequentially connected with the radioactive iodine injection device, the experiment box body, the vacuum pump, the first flowmeter and the sampling clamp;
s2, starting a vacuum pump, determining that the experiment box body is in a negative pressure state, adjusting a first flowmeter, and adjusting the flow of the system to be a set flow;
specifically, before the vacuum pump is started, the first inlet and the second flowmeter of the gas flow control valve are confirmed to be in a closed state; the second inlet of the gas flow control valve is in an open state.
In a specific embodiment, in step S2, the flow rate of the system is adjusted to 30L/min by adjusting the first flow meter.
Optionally, step S2 further includes the following steps: measuring the temperature and the humidity of an experiment box body, and keeping the temperature and the humidity balance of the experiment box body; the temperature and the humidity of the experimental box body are kept balanced for at least 30min.
S3, injecting radioactive iodine into the experiment box body, and adjusting the injection flow of the radioactive iodine;
specifically, in step S3, the radioiodine is radioiodine.
Optionally, in step S3, controlling the injection flow rate of radioactive iodine and the concentration of radioactive iodine in the experimental box by adjusting the opening of the first inlet of the gas flow control valve, the first flow meter and the second flow meter; while controlling the injection time of radioactive iodine.
The concentration of the radioactive iodine in the experiment box body is controlled to be 1-2.5 mg/L, and the actual scene of trace radioactive iodine can be simulated according to the requirements of the actual application scene.
In a specific embodiment, step S3 includes the following specific steps: and injecting radioactive methyl iodide into the experiment box body for 10min at an injection flow rate of 0.1 mg/min by adjusting the opening of the first inlet of the gas flow control valve, the first flowmeter and the second flowmeter, wherein the concentration of the radioactive methyl iodide in the experiment box body is 1.75mg/L.
S4, after stopping injecting the radioactive iodine, closing the vacuum pump, taking down the radioactive iodine protective mask to be tested and the sampling clamp, and respectively testing the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp through a gamma spectrometer;
in one specific embodiment, the radioactivity of the radioactive iodine mask to be tested and the radioactivity of the sampling clip are measured by a gamma spectrometer for 300s, respectively.
Optionally, the method further comprises the steps of: the radioactive iodine protective mask to be tested and the sampling clamp which are not subjected to experiments are respectively tested for 1800s, and the measured results are used as the corresponding radioactive background activity of the radioactive iodine protective mask to be tested and the radioactive background activity of the sampling clamp.
The radioactivity background activity of the radioactive iodine protective mask to be detected is subtracted from the radioactivity activity of the radioactive iodine protective mask to be detected, so that the net counting rate of the radioactive iodine protective mask to be detected can be obtained; the radioactivity background activity of the sampling clamp is subtracted from the radioactivity background activity of the sampling clamp, so that the net count rate of the sampling clamp can be obtained.
S5, determining the filtering efficiency of the radioactive iodine protective mask to be detected: and calculating the filtering efficiency of the radioactive iodine protective mask to be detected according to the filtering efficiency formula.
The formula of the filtering efficiency is as follows:
wherein, A-net count rate of the radioactive iodine protective mask to be detected, CPM;
b-the net count rate of the sampling clip, CPM.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The utility model provides a radioactive iodine protective mask efficiency test's system, its characterized in that, the system mainly includes radioactive iodine injection device, experiment box, vacuum pump, first flowmeter, the sampling clamp that connects gradually through the pipeline, wherein:
the radioactive iodine injection device comprises a radioactive iodine storage bottle, a gas flow control valve and an air filter; the first inlet of the gas flow control valve is connected with the radioactive iodine storage bottle, the second inlet of the gas flow control valve is connected with the outlet of the air filter, and the outlet of the gas flow control valve is connected with the injection port of the experiment box body; the inlet of the air filter is communicated with the atmosphere;
the radioactive iodine protective mask placing position is arranged in the experiment box body and is used for installing the radioactive iodine protective mask to be detected;
and an outlet of the sampling clamp is connected with the tail gas treatment unit.
2. A system for testing the efficiency of a radioiodine facemask of claim 1, wherein a second flowmeter is mounted to the connecting conduit between the radioiodine bottle and the first inlet of the gas flow control valve.
3. A method of radioiodine facepiece efficiency testing based on the radioiodine facepiece efficiency testing system of claim 2, comprising the steps of:
s1, constructing a system for testing the efficiency of the radioactive iodine protective mask: the radioactive iodine mask to be detected is arranged on a radioactive iodine mask placing position in the experiment box body through a pipeline sequentially connected with the radioactive iodine injection device, the experiment box body, the vacuum pump, the first flowmeter and the sampling clamp;
s2, starting a vacuum pump, and determining that the experiment box body is in a negative pressure state; adjusting a first flowmeter to adjust the flow of the system to a set flow;
s3, injecting radioactive iodine into the experiment box body, and adjusting the injection flow of the radioactive iodine;
s4, after stopping injecting the radioactive iodine, closing the vacuum pump, taking down the radioactive iodine protective mask to be tested and the sampling clamp, and respectively testing the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp;
s5, determining the filtering efficiency of the radioactive iodine protective mask to be detected.
4. A method of testing the efficiency of a radioiodine facemask as claimed in claim 3, wherein said step S2 further comprises the steps of: and measuring the temperature and the humidity of the experiment box body, and keeping the temperature and the humidity balance of the experiment box body.
5. A method of testing the efficiency of a radioiodine facemask as claimed in claim 3 wherein in step S3, the radioiodine is radioiodine.
6. A method of testing the efficiency of a radioiodine facemask according to claim 3, wherein in step S3, the injection flow rate of radioiodine, and the concentration of radioiodine in the experimental tank are controlled by adjusting the opening of the first inlet of the gas flow control valve, the first flow meter, the second flow meter; while controlling the injection time of radioactive iodine.
7. The method for testing the efficiency of a radioiodine facemask of claim 6, wherein the concentration of radioiodine in the test box is controlled to be 1-2.5 mg/L.
8. A method for testing the efficiency of a radioiodinated mask according to claim 3, wherein in step S4, the radioactivity of the radioiodinated mask to be tested and the radioactivity of the sampling clip are measured by a gamma spectrometer, respectively.
9. A method of testing the efficiency of a radioiodine facemask as claimed in claim 3, further comprising the steps of, prior to step S5: the radioactivity of the radioactive iodine protective mask to be tested and the radioactivity of the sampling clamp which are not tested are respectively tested, and the measured result is used as the radioactivity background activity of the corresponding radioactive iodine protective mask to be tested and the radioactivity background activity of the sampling clamp;
the radioactivity background activity of the radioactive iodine protective mask to be detected is subtracted from the radioactivity activity of the radioactive iodine protective mask to be detected, so that the net counting rate of the radioactive iodine protective mask to be detected is obtained; and subtracting the radioactivity background activity of the sampling clamp from the radioactivity activity of the sampling clamp to obtain the net count rate of the sampling clamp.
10. The method for testing the efficiency of a radioiodine facemask of claim 9, wherein in step S5, the filtration efficiency of the radioiodine facemask to be tested is calculated according to a filtration efficiency formula, the filtration efficiency formula being:
filtration efficiency
Wherein, A-net count rate of the radioactive iodine protective mask to be detected, CPM;
b-the net count rate of the sampling clip, CPM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310975756.7A CN117214205A (en) | 2023-08-03 | 2023-08-03 | System and method for testing efficiency of radioactive iodine protective mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310975756.7A CN117214205A (en) | 2023-08-03 | 2023-08-03 | System and method for testing efficiency of radioactive iodine protective mask |
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| Publication Number | Publication Date |
|---|---|
| CN117214205A true CN117214205A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310975756.7A Pending CN117214205A (en) | 2023-08-03 | 2023-08-03 | System and method for testing efficiency of radioactive iodine protective mask |
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| Country | Link |
|---|---|
| CN (1) | CN117214205A (en) |
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2023
- 2023-08-03 CN CN202310975756.7A patent/CN117214205A/en active Pending
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