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A Method for Simultaneously Measuring Mixed Concentration of 220rn and 222Rn in Environment
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A synchronous measurement, 222rn technology, applied in the field of nuclear radiation detection, can solve problems such as complex experiments or calculations
Inactive Publication Date: 2015-12-09
HENGYANG NORMAL UNIV
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Problems solved by technology
Currently utilizing scintillation chambers for simultaneous measurements 222 Rn, 220 Rn concentration methods all require complex experiments or calculations
Method used
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Embodiment 1
[0052] Embodiment 1. A synchronous measurement environment 220 Rn, 222 For the method of Rn mixing concentration, the specific operation steps are as follows:
[0053] Close the first valve 4, start pump 1, environment 220 Rn, 222 The Rn mixed air enters the tee 3 through the flow meter 12, the regulating valve 11, and the filter 10, and then enters the environment through the first vacuum gauge 2 and the pump 1. The flow rate of pump 1 is very high, making the tee 3 220 Rn, 222 The concentration of Rn and the environmental 220 Rn, 222 The Rn concentration is the same.
[0054] The second vacuum gauge 5 and the three-way valve 8 are connected to the low-pressure single scintillation chamber 7. Assuming that the maximum distance from any point in the low-pressure single scintillation chamber 7 to the surface coated with zinc sulfide is L, reduce the air pressure in the low-pressure single scintillation chamber 7 , 222 Rn, 220 The alpha particles emitted by the decay of Rn and its da...
Embodiment 2
[0079] Embodiment 2. A synchronous measurement environment 220 Rn, 222 For the method of Rn mixing concentration, the specific operation steps are as follows:
[0080] Close the first valve 4, start pump 1, environment 220 Rn, 222 The Rn mixed air enters the tee 3 through the flow meter 12, the regulating valve 11, and the filter 10, and then enters the environment through the first vacuum gauge 2 and the pump 1. The flow rate of pump 1 is very high, making the tee 3 220 Rn, 222 The concentration of Rn and the environmental 220 Rn, 222 The Rn concentration is the same.
[0081] The second vacuum gauge 5 and the three-way valve 8 are connected to the low-pressure single scintillation chamber 7. Assuming that the maximum distance from any point in the low-pressure single scintillation chamber 7 to the surface coated with zinc sulfide is L, reduce the air pressure in the low-pressure single scintillation chamber 7 , 222 Rn, 220 The alpha particles emitted by the decay of Rn and its da...
Embodiment 3
[0108] Embodiment three, a synchronous measurement environment 220 Rn, 222 For the method of Rn mixing concentration, the specific operation steps are as follows:
[0109] Close the first valve 4, start pump 1, environment 220 Rn, 222 The Rn mixed air enters the tee 3 through the flow meter 12, the regulating valve 11, and the filter 10, and then enters the environment through the first vacuum gauge 2 and the pump 1. The flow rate of pump 1 is very high, making the tee 3 220 Rn, 222 The concentration of Rn and the environmental 220 Rn, 222 The Rn concentration is the same.
[0110] The second vacuum gauge 5 and the three-way valve 8 are connected to the low-pressure single scintillation chamber 7. Assuming that the maximum distance from any point in the low-pressure single scintillation chamber 7 to the surface coated with zinc sulfide is L, reduce the air pressure in the low-pressure single scintillation chamber 7 , 222 Rn, 220 The alpha particles emitted by the decay of Rn and it...
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Abstract
The invention relates to a method for synchronously measuring the environment 220Rn and 222Rn mixed concentration. The method includes the operation steps of closing a first valve, starting a pump, enabling environment 220Rn and 222Rn mixed air to enter a tee joint through a flowmeter, an adjusting valve and a filter, then enabling the environment 220Rn and 222Rn mixed air to enter the environment through a first vacuum meter and the pump, and enabling 220Rn and 222Rn in the tee joint to be coincident with the environment 220Rn and 222Rn in concentration, wherein the flowing rate in the pump is quite high; adjusting the air pressure in a low pressure single-flicking chamber to reach P1, and enabling the air pressure to have the same detection efficiency the alpha particles emitted by the disintegration of 222Rn, the alpha particles emitted by the disintegration of 220Rn, the alpha particles emitted by the disintegration of the daughters of the 222Rn and the 220Rn; closing the a-b end of a three-way valve, opening the b-c end of the three-way valve, vacuumizing the low pressure single-flicking chamber, then closing the b-c end of the three-way valve, opening the a-b end of the three-way valve, and simultaneously opening the valve to conduct sampling; after sampling is carried out, closing the valve, recoding the current air pressure value P2 of the low pressure single-flicking chamber, and enabling the P2 to be smaller than or equal to the P1; starting a flicking chamber measuring device to start measurement, and using corresponding calculating methods to obtain the environment 220Rn and 222Rn concentration only by using counts obtained by measurementin each period.
Description
Technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a low-pressure single scintillation chamber 220 Rn, 222 Method of simultaneous measurement of Rn mixture concentration. Background technique [0002] In the environment 222 Rn is the main source of natural radiation to human beings. 220 Interest in Rn level surveys has shown a clear upward trend. The survey found that in some environments 220 The concentration of Rn is high, and the soil in our country 232 The content of Th is obviously higher than the world average. 220 Since Rn has a half-life of only 55.6 seconds, its measurement is unique. Synchronous measurement using scintillation chamber 222 Rn, 220 The methods of Rn concentration require complicated experiments or calculations. Summary of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a low-pressure single scintillation chamber 2...
Claims
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Application Information
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