紫外線およびガンマ線が商用硼珪酸ガラスにおよぼす効果の比較 : 紫外線照射によるガラス中の応力発生 (第4報)

概要

論文の詳細を見る
Contraction (density increase) and stress build-up in borosilicate glasses by ultra-violet irradiation were reported by the authors (J. Ceram. Asso. Japan, 72 [11-1] 193 (1964)). Experiments were carried out to check on correlation between these phenomena and some electronic process (formation of colour center or space charge, accumulation of luminescence and their thermal release) caused by irradiation.Three groups of glass samples were examined with the results described below:1. Six kinds of commercial glasses were irradiated by Co60 gamma ray with total dose of 7×107r. In spite of distinct blackening density change was not recognized. Thermoluminescence was intense in fused silica, while not recognized in lead glasses.2. Outer protection bulb (soda borosilicate glass) of a mercury discharge lamp damaged by ultra-violet irradiation showed stress at inner surface and colouring, and by heating bleaching, thermoluminescence and release of space charge took place. These proved that the damage was not a result of thermal effect such as overheating.3. Two kinds of commercial borosilicate glasses were irradiated by 400W mercury discharge lamp for two weeks or by Co60 gamma ray with total dose of 5×107r. In the former ones, though colouring and thermoluminescence were slight or unrecognized, stress build-up at irradiated surfaces was observed. In the later ones, distinct blackening and thermoluminescence were observed.Interaction between ultra-violet ray and glass and related problems were discussed. Temperature ranges in which various thermal release phenomena took place were compared. Following the authors opinion, contraction of glass by ultra-violet irradiation seemed not to directly related with electronic phenomena. Strictly speaking, however, this is still an open question. Moreover, the possibility of triggering or catalytic actions of electronic processes is a problem to be studied in future.
1965-08-01

紫外線およびガンマ線が商用硼珪酸ガラスにおよぼす効果の比較 : 紫外線照射によるガラス中の応力発生 (第4報)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク