Authors:
R. Matsushita Kyoto University Research Reactor Institute Kumatori-cho, Sennan-gun 590-04 Osaka Japan

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M. Koyama Kyoto University Research Reactor Institute Kumatori-cho, Sennan-gun 590-04 Osaka Japan

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S. Yamada Kyoto University Research Reactor Institute Kumatori-cho, Sennan-gun 590-04 Osaka Japan

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M. Kobayashi Kyoto University Research Reactor Institute Kumatori-cho, Sennan-gun 590-04 Osaka Japan

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H. Moriyama Kyoto University Research Reactor Institute Kumatori-cho, Sennan-gun 590-04 Osaka Japan

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Abstract  

In order to improve the accuracy of reactor neutron activation analysis, flux gradients and spectrum changes in the irradiation capsule have been studied at the Kyoto University Reactor (KUR). The flux and spectrum monitoring samples of Fe, Co, Au, Sb, U and Ni were placed at several positions in a polyethylene irradiation capsule of 24 mm inner diameter and 98 mm length, and were irradiated in a pneumatic irradiation facility (Pn-2). The flux gradients were found to be rather negligible in the vertical (axial) direction while they were considerable in the radial one. The flux gradient was around 5%/cm for thermal neutrons and 10%/cm for epithermal and fast neutrons. The spectrum changes were dependent on the materials (polyethylene and silica) filled in the capsule. Based on these observations, the effect of the flux gradients and spectrum changes on the accuracy of reactor neutron activation analysis was discussed.

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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)