Method for detecting specific activity of tritiated steam in air

A measurement method, water vapor technology, applied in radiation measurement, measurement device, X/γ/cosmic radiation measurement, etc., can solve problems such as inability to achieve accurate sampling, inability to detect values ​​by instruments, and inapplicability of tritium detection, etc., to achieve The effect of exquisite design, high precision and low environmental requirements

Inactive Publication Date: 2016-08-10
NUCLEAR & RADIATION SAFETY MONITORING CENT OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for measuring tritium activity mainly include direct method and indirect method. The direct method is to use gas detectors such as ionization chambers and proportional counters for gas measurement. The indirect method is to use scintillator detectors after catalytic oxidation of tritium into tritiated water. For measurement, the sensitivity of the former is low. When the specific activity of tritium is low, the instrument cannot detect accurate values. It is not suitable for the detection of tritium in conventional air, but only for the measurement of tritium in radioactive workplaces. The latter Although the sensitivity is high, it is simple and can handle a large number of samples, but the existing sampling methods cannot achieve accurate sampling in the low temperature environment in the north in winter

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  • Method for detecting specific activity of tritiated steam in air
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  • Method for detecting specific activity of tritiated steam in air

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The method for measuring the specific activity of tritiated water vapor in the air at site 1 (test temperature is about 278K) includes the following steps:

[0038] ①Sample collection: The device required for sample collection consists of particle filter, flow regulating valve, flow meter, absorption bottle A, absorption bottle B, color-changing silica gel indicator tube and air pump, such as figure 1As shown, the activated 3A molecular sieve is installed in the absorption bottle A and the absorption bottle B, and the volume of the 3A molecular sieve accounts for more than two-thirds of the absorption bottle A and the absorption bottle B, and the devices required for sample collection are installed in the Start the air pump at a height of 1.0m from the ground, adjust the flow regulating valve so that the flow rate of the flowmeter is at 2.0L / min, start sampling, and turn off the air pump in turn when the silica gel of the color-changing silicone indicator tube changes fr...

Embodiment 2

[0043] The method for measuring the specific activity of tritiated water vapor in the air at site 2 (test temperature is about 273K) includes the following steps:

[0044] ①Sample collection: The device required for sample collection consists of particle filter, flow regulating valve, flow meter, absorption bottle A, absorption bottle B, color-changing silica gel indicator tube and air pump, such as figure 1 As shown, the activated 3A molecular sieve is installed in the absorption bottle A and the absorption bottle B, and the volume of the 3A molecular sieve accounts for more than two-thirds of the absorption bottle A and the absorption bottle B, and the devices required for sample collection are installed in the Start the air pump at a height of 1.0m from the ground, adjust the flow regulating valve so that the flow rate of the flowmeter is at 2.0L / min, start sampling, and turn off the air pump in turn when the silica gel of the color-changing silicone indicator tube changes f...

Embodiment 3

[0049] The method for measuring the specific activity of tritiated water vapor in the air at site 3 (test temperature is 263K) includes the following steps:

[0050] ①Sample collection: The device required for sample collection consists of particle filter, flow regulating valve, flow meter, absorption bottle A, absorption bottle B, color-changing silica gel indicator tube and air pump, such as figure 1 As shown, the activated 3A molecular sieve is installed in the absorption bottle A and the absorption bottle B, and the volume of the 3A molecular sieve accounts for more than two-thirds of the absorption bottle A and the absorption bottle B, and the devices required for sample collection are installed in the Start the air pump at a height of 0.9m from the ground, adjust the flow regulating valve so that the flow rate of the flowmeter is at 3.0L / min, start sampling, and turn off the air pump in turn when the silica gel of the color-changing silicone indicator tube changes from bl...

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Abstract

The invention discloses a method for detecting specific activity of tritiated steam in air. The method particularly comprises the steps of absorbing the tritium steam in air by means of a 3A molecular sieve, collecting tritiated water absorbed in the 3A molecular sieve through freezing and sublimating in a freeze drying device, performing absorption and micro-filtering on the collected tritiated water after collection, and detecting the specific activity of the tritiated water. Because the method of the invention realizes relatively high collecting efficiency on the tritiated water and small residual amount of sampling medium, the method can be used for collecting the tritiated water in the air. Furthermore the specific activity of the tritiated water can be detected on condition of relatively low specific activity and furthermore relatively high data precision is realized. The collecting efficiency of the method can reach 99%, and the residual amount of the sampling medium is lower than 1%.

Description

technical field [0001] The invention relates to a method for measuring the activity of radioactive gases, in particular to a method for measuring the specific activity of tritiated water vapor in air. Background technique [0002] Tritium is an important radioactive gas nuclide emitted by the fission power operation reactor. The tritium leaked into the surrounding environment by various nuclear facilities will lead to an increase in the tritium activity of the surrounding atmosphere, and the staff working in the reactor building and related auxiliary buildings of the nuclear power plant will The ingestion of tritium through various ways will cause a certain degree of internal exposure. Therefore, improving the detection accuracy of tritium activity in the air is a key issue in the determination of gaseous tritium. [0003] At present, the methods for measuring tritium activity mainly include direct method and indirect method. The direct method is to use gas detectors such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/178
CPCG01T1/178
Inventor 程丰民丁洪深吕蕴海罗磊夏冰刘卫东华芳
Owner NUCLEAR & RADIATION SAFETY MONITORING CENT OF SHANDONG PROVINCE
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