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Method and device for measuring powder environmental sample alpha radionuclide

A technology for environmental samples and alpha radioactivity, which is used in measurement devices, radiation measurement, X-ray energy spectrum distribution measurement, etc. Effect

Inactive Publication Date: 2014-09-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cylindrical ionization chambers are not suitable for direct measurement of the energy spectrum of alpha nuclides due to the obstruction of alpha particles by its metal outer wall

Method used

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  • Method and device for measuring powder environmental sample alpha radionuclide
  • Method and device for measuring powder environmental sample alpha radionuclide
  • Method and device for measuring powder environmental sample alpha radionuclide

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0030] figure 1 Schematic diagram of the measurement room structure. The measurement chamber structure includes: (1) mesh cylindrical chamber, (2) sample diaphragm, (3) sample delivery drawer, (4) sample box, (5) air inlet, (6) air outlet, (7) measurement Outdoor shell. The sample delivery drawer is located in the lower part of the chamber, and the sample box is placed on the sample delivery drawer. Three mesh cylindrical chambers are arranged horizontally and are located in the upper part of the sample box.

[0031] The working gas in the measurement chamber can be argon methane gas, which is composed of a mixed gas of 90% argon and 10% methane. As a reactive gas, argon is mainly used to generate ionization discharge after interacting with alpha particles. As a quenching gas, methane's main function is to effectively absorb the photons generated in the aval...

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Abstract

The invention discloses a method and device for measuring powder environmental sample alpha radionuclide. The device comprises a measuring chamber, a lead chamber, a gas supply system, a high-pressure source, a pre-amplifier, a data processing module and a computer. By the utilization of the characteristic that cylindrical multi-wire direct-proportion tubes are insensitive to the particle trajectory of incident particles and an initial ionization position when used for measuring alpha particles, and the horizontally-ranked cylindrical multi-wire direct-proportion tubes are used for designing a device detection chamber, so that the defect that in the alpha energy spectrum measuring process, a gold silicon surface barrier detector cannot directly measure powder samples is overcome. The method and device have the advantages that detection efficiency for activity of the powder environmental sample alpha radionuclide is high, and energy resolution is good.

Description

Technical field [0001] The invention belongs to the technical field of nuclear instrument development and nuclear radiation measurement, and specifically relates to a measuring method and a measuring device for the alpha radionuclide of a powder environmental sample; it uses a new type of measuring chamber composed of a multifilament proportional chamber as the detector of the device , It has the advantages of high activity detection efficiency for the powder environment sample α and good energy resolution. Background technique [0002] Environmental samples include soil, water, air and organisms in the environment. The commonly used method for measuring the alpha radionuclide content of environmental samples is to measure the total activity of alpha particles in environmental samples. Environmental samples usually contain more than one radionuclide. To determine the content of a specific alpha radionuclide, it is also necessary to perform alpha spectrometry on the sample to id...

Claims

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Application Information

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IPC IPC(8): G01T1/178G01T1/36
Inventor 林业方方汪栋陈伟王冬于松科
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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