DS86 Neutron Dose : Monte Carlo Analysis for Depth Profile of 15 Eu Activity in a Large Stone Sample

URI http://harp.lib.hiroshima-u.ac.jp/hbg/metadata/5695
File
Title
DS86 Neutron Dose : Monte Carlo Analysis for Depth Profile of 15 Eu Activity in a Large Stone Sample
Author
氏名 岡 隆光
ヨミ オカ タカミツ
別名 Oka Takamitsu
氏名
ヨミ イワタニ カズオ
別名 Iwatani Kazuo
氏名
ヨミ エンドウ サトル
別名 Endo Satoru
氏名 星 正治
ヨミ ホシ マサハル
別名 Hoshi Masaharu
氏名 静間 清
ヨミ シズマ キヨシ
別名 Shizuma Kiyoshi
氏名
ヨミ イマナカ テツジ
別名 Imanaka Tetsuji
氏名
ヨミ タカダ ジュン
別名 Takada Jun
氏名
ヨミ フジタ ショウイチロウ
別名 Fujita Shoichiro
氏名 葉佐井 博巳
ヨミ ハサイ ヒロミ
別名 Hasai Hiromi
Abstract

The depth profile of 152Eu activity induced in a large granite stone pillar by Hiroshima atomic bomb neutrons was calculated by a Monte Carlo N-Particle Transport Code (MCNP). The pillar was on the Motoyasu Bridge, located at a distance of 132 m (WSW) from the hypocenter. It was a square column with a horizontal sectional size of 82.5 cm x 82.5 cm and height of 179 cm. Twenty-one cells from the north to south surface at the central height of the column were specified for the calculation and Eu activities for each cell were calculated. The incident neutron spectrum was assumed to be the angular fluence data of the Dosimetry System 1986 (DS86). The angular dependence of the spectrum was taken into account by dividmg the whole solid angle into twenty-six directions. The calculated depth profile of specific activity did not agree with the measured profile. A discrepancy was found in the absolute values at each depth with a mean multiplication factor of 0.58 and also in the shape of the relative profile. The results indicated that a reassessment of the neutron energy spectrum in DS86 is required for co汀ect dose estimation.

Journal Title
Journal of radiation research
Volume
40
Issue
2
Spage
169
Epage
181
Published Date
1999-06
Publisher
日本放射線影響学会
Language
eng
NIIType
Journal Article
Text Version
Old URI
Set
hbg