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Physical Dosimetry at Nagasaki-Europium-152 of Stone Embankment and Electron Spin Resonance of Teeth from Atomic Bomb Survivors : I. DOSIMETRY


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Title: Physical Dosimetry at Nagasaki-Europium-152 of Stone Embankment and Electron Spin Resonance of Teeth from Atomic Bomb Survivors : I. DOSIMETRY
Authors: Tatsumi-Miyajima, Junko / Okajima, Shunzo
Issue Date: Mar-1991
Publisher: 日本放射線影響学会
Citation: Journal of radiation research. 1991, 32(Supple_1), p.83-98
Abstract: Gamma-rays from thermal neutron-induced radionuclide of ^<152>Eu in rocks near the ground center of the atomic bomb (A-bomb) explosion (hypocenter) in Nagasaki were measured with a pure germanium semiconductor detector. Depth profiles of ^<152>Eu activity were obtained for 22 core samples taken from stone embankments on both sides of two rivers (the River Shirnono-kawa and the River Urakami-gawa) within 500 m of the hypocenter since the activity in the rocks has a history of incident neutron energy. Although the activities of the surface sections were varied from sample to sample, the slopes of depth profile in rock and the value of ^<152>Eu activity in the depth of 240-280 mm were similar among the samples taken from the same location. On the other hand, neutron penetrating experiments using both a fast and a thermal neutron reactor were performed to obtain the relationship between the incident neutron energy spectra and the depth profiles of ^<152>Eu activity in rock. The depth profiles in the bomb exposed samples were close to that obtained by using a 10 mm polyethelene moderator in the reactor experiments. Electron spin resonance (ESR) measurements from teeth of A-bomb survivors were carried out to estimate the individual gamma-ray dose of the survivors. The absorbed dose of ten tooth samples was estimated by ESR dosimetry. The results of ESR dosimetry were consistent with the calculations of tissue dose in air of A-bombs and irradiated shielding configuration of individuals.
Keywords: Atomic bomb / Nagasaki / ^<152>Eu / ESR / Dosimetry
URI: http://hdl.handle.net/10069/18910
ISSN: 04493060
Relational Links: http://ci.nii.ac.jp/naid/110002327908/
Rights: 日本放射線影響学会 / 本文データは学協会の許諾に基づきCiNiiから複製したものである
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/18910

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