基于钕铁硼磁粉的α表面污染模拟方法研究

doi:10.13491/j.issn.1004-714X.2020.01.011

2020, Vol. 29

Issue (1): 49-52,56 DOI: 10.13491/j.issn.1004-714X.2020.01.011

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Study on α radioactive surface contamination simulation method based on NdFeB magnetic powder

WANG Qi^1,2, JI Yunlong¹, LI Dawei¹, WANG Xiaoning¹, NING Jing¹

1. Beijing Institute of Radiation Medicine, Beijing 100039 China;
2. Xingcheng Special Service Sanatorium of Strategic Support Force

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Abstract Objective To develop a safe and reliable simulative source for nuclear emergency medical assistance training.Methods α surface sources are measured by a portable α surface radioactivity detector to summarize the correlations. A magnetic field is used to simulate the α-radiation field, and NdFeB magnetic powder is used as the magnetic source. Magnetic powder mixed with colloid is magnetized in a magnetic field to prepare magnetic powder colloid. The magnetic powder colloid is applied to the surface of an object as a simulated source. A specific detection circuit is designed to detect the simulated source. By using a certain conversion formula, voltage value is converted into count rate or an activity value to simulate the α surface contamination.Results The count rate of the α surface source measured by the portable α detector shows a linear relation with the measuring distance within the range of the α beam. The simulated source prepared by using NdFeB magnetic powder and colloid has the properties of α surface contamination, and can simulate a real measurement of α surface radioactivity within the range of 0.5～3 cm. Besides, signal decrease in process of decontamination can also be simulated.Conclusion The α radioactive surface contamination simulation method based on NdFeB magnetic powder is safe and reliable, and has no radiation hazard. It can be applied to the training of α surface radioactivity detection and decontamination, which has certain practical value for improving the training level and consequently improving the actual assistance ability of the nuclear emergency assistance team.

Key words： Nuclear Emergency NdFeB Magnetic Powder α Radioactive Surface Contamination Simulation

Received: 27 September 2019

PACS:

X591

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	WANG Qi
	JI Yunlong
	LI Dawei
	WANG Xiaoning
	NING Jing

Cite this article:

WANG Qi,JI Yunlong,LI Dawei, et al. Study on α radioactive surface contamination simulation method based on NdFeB magnetic powder[J]. , 2020, 29(1): 49-52,56.

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http://www.zgfsws.com/EN/10.13491/j.issn.1004-714X.2020.01.011 OR http://www.zgfsws.com/EN/Y2020/V29/I1/49