Method and device for absolutely measuring for radioactive gas nuclide activity

A technology for radioactive gas and nuclide activity, which is applied in the field of gas radioactivity measurement methods and measurement devices, and can solve problems such as low specific activity

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A technology for radioactive gas and nuclide activity, which is applied in the field of gas radioactivity measurement methods and measurement devices, and can solve problems such as low specific activity

CN101806910AInactive Publication Date: 2010-08-18NORTHWEST INST OF NUCLEAR TECH

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[0049] The mathematical theoretical basis of the inventive method:

[0050] The basic principle of coincidence measurement method is based on the probability relationship between events, when for a sample space N 0 Two random independent samplings are carried out, and the sampling results N are recorded separately β and N γ At the same time, record the same result N of the two sampling c , then the probabilities of two independent samples are:

[0051] P ( β ) = N β N 0 with P ( γ ) = N γ N 0

[0052] The probability of the same event occurring after two independent samples is:

[0053] P ( β ∩ γ ) ...

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Abstract

The invention relates to a method and a device for absolutely measuring for radioactive gap nuclide activity. The method comprises the following steps: 1) building a gas nuclide coincidence measurement device; 2) preparing a sample; 3) debugging the device; 4) measuring performance parameters of the device; and 5) measuring a gas radioactivity body source, and calculating specific activity. The invention solves the technical problem that the existing length compensation method has low absolute measurement specific activity to certain high-energy beta radial gas nuclide activity. The invention provides a new method for the absolute measurement of the gas nuclide activity.

Description

technical field [0001] The present invention makes a new elaboration on the principle of the coincidence method for measuring activity, and applies the coincidence method to the measurement of radioactive gas nuclide activity, belongs to the category of radionuclide activity measurement, and specifically relates to a gas radioactivity measurement method and measuring devices. Background technique [0002] For the absolute measurement of gas nuclide activity, the length compensation method is used at home and abroad. The basic principle of the length compensation method is to use two in-filled proportional counter tubes with different lengths but the same other conditions to record the particles emitted by the radionuclide in the tubes, and use the specific activity of the gas in the volume difference between the two tubes as the gas to be measured. The radioactive specific activity of the nuclide. The specific method is to correct the wall effect, lower threshold, dead tim...

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Application Information

Patent Timeline

18 Aug 2010

Publication

CN101806910A

IPC: G01T1/18

Inventors: 李谋; 代义华