Investigation of the migration of 237Np in loess by direct gamma-ray method

C. Liu; S. Ni; X. Han; S. Li; Z. Wang

doi:10.1007/s10967-006-6831-2

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 272: Issue 1

Investigation of the migration of ²³⁷Np in loess by direct gamma-ray method

Authors:

C. Liu

C. Liu

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S. Ni

S. Ni China Institute for Radiation Protection P.O. Box 120 Taiyuan Shanxi 030006 P.R. China

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X. Han

X. Han China Institute for Radiation Protection P.O. Box 120 Taiyuan Shanxi 030006 P.R. China

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S. Li

S. Li China Institute for Radiation Protection P.O. Box 120 Taiyuan Shanxi 030006 P.R. China

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Z. Wang

Z. Wang China Institute for Radiation Protection P.O. Box 120 Taiyuan Shanxi 030006 P.R. China

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Pages:: 161–166

Online Publication Date:: 03 Feb 2007

Publication Date:: 01 Apr 2007

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-006-6831-2

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Abstract

The migration of ²³⁷Np in an undisturbed Chinese loess column was investigated by direct γ-ray method. The column was taken from a field test site and installed in a laboratory simulation hall. Radionuclide ²³⁷Np in the form of neptunium nitrate, mixed with quartz, was introduced into the column and covered with loess. Artificial rainfall was applied to the column for about 3 years and, the counting rates of ²³⁷Np in the column from 56 to 616 days at different vertical positions were detected with a γ-ray detection system. Based on the counting rates of ²³⁷Np in the simulation column at different vertical positions and the distance from the source layer, the relationship of the mass center of ²³⁷Np in the column at different experimental periods to the experimental time was established, C_m = 0.36 log(t)-2.75. Here C_m is the mass center of ²³⁷Np in the column, cm, and t is the experimental time in days. Based on this relationship, the mass center of ²³⁷Np for the 1,073-day experiment was predicted and compared to that obtained with the final destructive method. The good agreement between the prediction and the experimental values indicates that the direct γ-ray method could be used to predict the migration of strongly adsorbed radionuclides such as ²³⁷Np in environmental media with the help of laboratory simulation columns.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)