@article{oai:tobunken.repo.nii.ac.jp:00003816,
 author = {藤井, 義久 and 藤原, 裕子 and 木川, りか and 川野邊, 渉 and 永石, 憲道 and 中嶋, 啓二 and Yoshihisa, FUJII and Yuko, FUJIWARA and Rika, KIGAWA\nWataru KAWANOBE and Norimichi, NAGAISHI and Keiji, NAKAJIMA},
 issue = {50},
 journal = {保存科学, Science for conservation},
 month = {Mar},
 note = {The inner cavity of an air-dried wooden pole was estimated using gamma-ray. The apparatus used consists of a gamma-ray source, a detector, laser displacement sensors and guide rails. This apparatus is portable and does not take long to set up at a site. The two guide rails were placed across the sample and parallel to each other, and each rail held the source or the detector, positioned to face in opposite directions. The displacement sensors were installed to both the source and the detector. The source, the detector and the displacement sensors moved from one end to the other of the sample, and the attenuation of gamma-ray and the outer shape of the sample were measured at the same time. Density distribution inside the sample was estimated using the attenuation property and the width of the sample at each position. The result shows that the position and size of the inner cavity can be detected with the apparatus used. The challenges will now be to estimate other defects, such as low-density rotted area and cracks, and the effect of moisture content on detection performance.},
 pages = {185--189},
 title = {〔報告〕ガンマ線を用いた木製円柱の内部劣化の検出},
 year = {2011}
}