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Method for testing 224Ra in sediment by using pulse-type ionization chamber emanometer

A sedimentary and pulsed technology, applied in the field of analysis and testing, can solve the problems of high testing cost, limited application, and difficult portability of helium cylinders, and achieve the effects of high testing efficiency, low testing cost, and easy on-site testing.

Pending Publication Date: 2022-08-09
THE FIRST INST OF OCEANOGRAPHY SOA +2
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  • Application Information

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Problems solved by technology

However, the radium synchronous delay counter needs high-purity helium as the carrier gas in the process of use, the test cost is high, and the required helium cylinder is not easy to carry, which limits its application in the field test

Method used

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  • Method for testing 224Ra in sediment by using pulse-type ionization chamber emanometer
  • Method for testing 224Ra in sediment by using pulse-type ionization chamber emanometer
  • Method for testing 224Ra in sediment by using pulse-type ionization chamber emanometer

Examples

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Embodiment 1

[0082] take 6 different 224 Ra activity gradient silty sediment standard samples, using e.g. figure 1 In the experimental device shown, adjust the water content of the sediment standard sample to 30%, turn on the air pump, adjust the flow rate of the air pump to 1L / min, and circulate the gas in the system for 5 minutes to make the release of the sediment standard sample. 220 Rn gas and sediment in standard samples 224 Ra reached the radioactive equilibrium, and then the Rn in the test system was continuously tested for 2 hours to obtain 222 Rn and 220 The sum of the count rates of Rn C 1 . Turn off the air pump, close the air inlet and outlet valves of the PIC, and let stand for at least 5 minutes to allow the air in the PIC 220 Rn completely decayed and disappeared, and the Rn activity in PIC was continuously tested for 2 hours. 222 Rn count rate C 2 , the difference between the two measurement results before and after (C 1 -C 2 ) is in the system 220 The count rate...

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Abstract

The invention provides a method for testing 224Ra in sediments by using a pulse-type ionization chamber emanometer, and belongs to the technical field of analysis and testing. According to the method, the activity of < 220 > Rn is quantitatively distinguished and measured based on half-life period characteristics of different radon isotopes by means of a pulse type ionization chamber radon measuring instrument (PIC) which is a novel radon measuring instrument, and then the activity of < 224 > Ra in the sediment is measured according to a radioactive isotope long-term decay balance principle. A helium steel cylinder does not need to be carried, the testing cost is low, the testing device is simple, convenient and easy to carry, the testing efficiency is high, and field testing is facilitated.

Description

technical field [0001] The invention relates to the technical field of analysis and testing, in particular to a radon tester using a pulsed ionization chamber to test sediment 224 Ra's method. Background technique [0002] Short half-life radium isotopes ( 224 Ra, T 1 / 2 = 3.66d) is suitable for studying oceanographic processes on short time scales (days to weeks). 224 Ra studies in marine sediments 224 Ra / 228 Th imbalance phenomenon, and then by means of 224 Ra / 228 The Th imbalance method quantifies the exchange fluxes of trace metals, nutrients, and dissolved organic carbon at the sediment-water interface. Currently, the sediment 224 The general test method for Ra is the radium synchronous delay counter method. This method can accurately and rapidly measure sedimentary 224 Ra activity, its measurement accuracy is ±5% to 7%, and the reproducibility is ±5%. However, the radium synchronous delay counter needs high-purity helium gas as the carrier gas during the us...

Claims

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Application Information

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IPC IPC(8): G01T1/167G01T1/185
CPCG01T1/167G01T1/185G01N33/24G01T1/178G01N33/0093
Inventor 陈广泉刘文赵世彬李春乾郭金家王延诚许博超尹晓斐孙珊
Owner THE FIRST INST OF OCEANOGRAPHY SOA