title: Deep underground measurements of 60Co in steel exposed to the Hiroshima atomic bomb explosion.
abstract: When using gamma-ray spectrometry performed deep underground, it is possible to measure 60Co activities down to 0.1 mBq in steel samples of some 100 g without any pre-concentration. It is thus still possible to measure 60Co induced by neutrons from the atomic bomb explosion in Hiroshima in pieces of steel collected at distances up to about 1200 m slant range. The results of non-destructive measurements of eight steel samples are compared with the 1986 Dose Re-Evaluation (DS86) model calculations.
authors.affiliation: Institute for Reference Materials and Measurements, EC-JRC-IRMM, Retieseweg, Geel B-2440, Belgium.
authors.forename: Mikael
authors.initials: M
authors.lastname: Hult
authors.forename: Joël
authors.initials: J
authors.lastname: Gasparro
authors.forename: Roberto
authors.initials: R
authors.lastname: Vasselli
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Shizuma
authors.forename: Masaharu
authors.initials: M
authors.lastname: Hoshi
authors.forename: Dirk
authors.initials: D
authors.lastname: Arnold
authors.forename: Stefan
authors.initials: S
authors.lastname: Neumaier