Authors:
T. Mitsugashira Tohoku University Institute for Materials Research Katahira 2-1-1, Aoba-ku 980 Sendai (Japan)

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Y. Koma Tohoku University Institute for Materials Research Katahira 2-1-1, Aoba-ku 980 Sendai (Japan)

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S. Hirai Musashi Institute of Technology Atomic Energy Research Laboratory Ozenji, Asou-ku 215 Kawasaki (Japan)

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I. Okada Musashi Institute of Technology Atomic Energy Research Laboratory Ozenji, Asou-ku 215 Kawasaki (Japan)

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N. Kurashima Musashi Institute of Technology Atomic Energy Research Laboratory Ozenji, Asou-ku 215 Kawasaki (Japan)

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H. Sakurai Musashi Institute of Technology Atomic Energy Research Laboratory Ozenji, Asou-ku 215 Kawasaki (Japan)

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Abstract  

Highly sensitive neutron activation analysis of uranium and thorium in high quality silica and aluminium has been investigated using the Japan Materials Testing Reactor (JMTR), having a thermal neutron flux higher than 1014 n/cm2/s. In order to determine ultra-low contents of uranium and thorium,239Np and233Pa as activation products were separated by using anion exchange and LaF3 coprecipitation methods. As a result, a number of interfering radioactive isotopes containing double neutron capture product such as183Ta were removed completely from the isolated239Np and233Pa fraction and the detection limits for uranium and thorium were found to be 2·10–12 g and 4·10–13 g, respectively.

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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)