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Liquid scintillation counting method for measuring 231 Pa nuclide activity

A technology of nuclide activity and scintillation counting, which is used in measurement devices, radiation measurement, X/γ/cosmic radiation measurement, etc., and can solve problems such as inability to accurately measure nuclide activity.

Active Publication Date: 2020-07-24
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] As shown above, because there are many types of radionuclides and each nuclide has its own unique decay mode, many existing nuclide activity measurement methods cannot accurately measure 231 Pa nuclide activity

Method used

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  • Liquid scintillation counting method for measuring 231 Pa nuclide activity
  • Liquid scintillation counting method for measuring 231 Pa nuclide activity
  • Liquid scintillation counting method for measuring 231 Pa nuclide activity

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Embodiment 1

[0068] The present invention provides a measurement 231Liquid scintillation counting method for Pa nuclide activity, such as figure 1 As shown, the method steps at least include:

[0069] S1: Calculate 231 The kinetic equation of the Pa decay chain;

[0070] S2: build 231 The atomic concentration of neutron nuclides in the Pa decay chain and 231 The relationship between Pa atomic concentration;

[0071] S3: Build based on measured total count data 231 The function of the atomic concentration of the neutron nuclides in the Pa decay chain and the detection efficiency of the radionuclide;

[0072] S4: Measurement-based sample count and radionuclide detection efficiency calculation 231 Pa nuclide activity.

[0073] In the present invention, 231 The decay process of the Pa decay chain is as follows figure 2 shown.

[0074] calculate 231 The method steps of the kinetic equation of the Pa decay chain at least include:

[0075] Based on the law of radioactive decay 231 ...

Embodiment 2

[0106] This embodiment provides a measurement 231 The device for liquid scintillation counting of Pa nuclide activity is characterized in that the device at least includes a processor and a liquid scintillation analyzer. The processor is in data connection with the data processor of the liquid scintillation analyzer. Preferably, the processor can be integrated with the liquid scintillation analyzer, that is, the data processing module in the liquid scintillation analyzer performs the measurement of the present invention 231 Calculation equations in steps of liquid scintillation counting method for Pa nuclide activity.

[0107] Preferably, after obtaining the experimental data, the data processing module or data processing device in the liquid scintillation analyzer executes the calculation method of the processor to obtain 231 Pa nuclide activity. That is, the processor is embedded in the liquid scintillation analyzer, or the processor is integrated with the data processing...

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Abstract

The invention relates to a liquid scintillation counting method for measuring 231 Pa nuclide activity. The liquid scintillation counting method is characterized by at least comprising the following steps of calculating a kinetic equation of a 231 Pa decay chain; establishing a relationship between the atomic concentration of daughter nuclides in the 231 Pa decay chain and the 231 Pa atomic concentration; establishing a measurement equation based on the measured relationship among total count data, the atomic concentration of the daughter nuclides in the 231 Pa decay chain and the radionuclidedetection efficiency; and calculating the 231 Pa nuclide activity based on the measured sample count and the radionuclide detection efficiency. According to the liquid scintillation counting method for measuring the 231 Pa nuclide activity, the relation between the atomic concentration of the daughter nuclides in the 231 Pa decay chain and the 231 Pa atomic concentration is established by calculating the solution of the kinetic equation of the 231 Pa decay chain, the problems of 231 Pa radioactive imbalance and branch decay measurement can be solved, and the accuracy of a result is further improved.

Description

technical field [0001] The invention relates to the technical field of radionuclide detection, in particular to a measurement 231 Liquid scintillation counting method for Pa nuclide activity. Background technique [0002] Radioactivity is one of the basic quantities of ionizing radiation metrology, and its measurement method is an important part of ionizing radiation metrology, which is closely related to the development of various aspects of nuclear science and technology. Radioactivity refers to the number of decays of radioactive nuclei in a specific energy state per unit time, denoted as A, A=dN / dt=λN, where N represents the atomic concentration, and λ is the decay constant. The activity of radionuclides follows the law of exponential decay. The SI unit for activity is the Becquerel (Bq). [0003] Since there are many types of radionuclides, and each nuclide has its own unique decay mode, the measurement methods for the radioactivity of different types of nuclides are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/204
CPCG01T1/204
Inventor 刘皓然周倩倩范富有梁珺成张明
Owner NAT INST OF METROLOGY CHINA
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