Clearance assessment for building concrete through bulk in-situ -spectrometry (Contract research)

Maeda, Shingo*; Hirano, Takahiro*; Shimada, Taro; Nakayama, Shinichi

JAEA-Technology 2008-066, 35 Pages, 2008/10

JAEA-Technology-2008-066.pdf:4.83MB

Bulk in-situ -spectroscopy is effective for a slightly and uniformly contaminated surface such as a room surrounded by concrete walls. The time-consuming scoping scanning survey for the entire surface is essential to ensure the slight and uniform contamination prior to the bulk in-situ measurement. However, the scoping scanning survey is omissible if the conservative procedure is acceptable. The count rate, cps, for the material of interest can be obtained by in-situ Ge detector will be converted to the radioactivity using conversion factor, Bq/cps, which depends on the distance from the detector to the furthest point. The radioactive concentration, Bq/g, is evaluated by dividing the radioactivity by the "measurement unit" of 100 kg. This procedure could certainly produce a conservative value. If the value obtained by this procedure is lower than the regulated clearance level, the material of interest can be cleared without the prior scoping scanning survey.

Development of high strength lightweight net using aramid fiber for tornado missile, 1; Development plan and policy

Aizawa, Kosuke; Ishimaru, Masaru; Maeda, Shigetaka; Okada, Taiichi*; Hirose, Megumi*; Kumagai, Yukihiro*; Isaka, Shingo*

no journal, , 

High strength lightweight net using aramid fiber for tornado missile was developed. In this study, the static load experiments for one rope and net shape were conducted. From the results of experiments, development policy concerning optimization of net specifications was investigated.