水トリーの発生に伴う微弱X/γ線検出に関する一考察

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2012/11/01

タイトル(英語): A Study on Detection of Weak X/γ-ray with Growth of Water Trees

著者名: 熊澤　孝夫（中部電力（株）技術開発本部 エネルギー応用研究所），谷口　良一（大阪府立大学 放射線研究センター）

著者名(英語): Takao Kumazawa (Chubu Electric Power Co., Inc. Energy Applications R&D Center), Ryouichi Taniguchi (Osaka Prefecture University, Radiation Research Center)

キーワード: CVケーブル，水トリー，イオン，放射線，X線，γ線　　XLPE cable，water tree，ion，radiation，X-ray，γ-ray

要約(英語): We have observed and reported that weak γ-ray was radiated from water treed samples. In order to study the influence of inorganic impurities such as metal ions in XLPE on the radioactivity, we measured X/γ-ray and neutron carefully from XLPE samples immersed in NaCl and/or Pb(CH3COO)2 solution using BF3, CdTe and NaI detector in the condition of low background radiation. The counting rate of CdTe detector increased linearly with that of NaI detector, but each counting rate was not proportional to the growth of water trees. Furthermore, definitive residual radiation in the water treed samples, which attenuated rapidly to background level within a few hours after beginning of measurement, was observed by a Ge detector. We consider that the γ-ray observed during and after HV applying was emitted from 214Pb and 214Bi, as a result of analysis of the energy spectra. It is, however, difficult to explain that atmospheric radon gas (222Rn) which decays to above isotopes accumulated abundantly in water treed samples, because HV was applied in an air-tight flask filled with the solution. On the whole, these phenomena on the radiation of X/γ-ray do not seem to be directly associated with the growth of water trees.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.132 No.11 （2012） 特集：放電現象・新素材とその応用技術

本誌掲載ページ: 1045-1052 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/132/11/132_1045/_article/-char/ja/