電離槽型線量計のStem Leakageについて

概要

論文の詳細を見る
In Measuring radiation doses, It has been often noted that a finger sized condenser chamber irradialed all over shows an erroneously high value because of stem leakage due to irradiation. This is not the case when only ionization chamber is irradiated. As this is practically important in measuring radiation doses, experiments were done in order not only to caluculate the range of the error due to the stem leakage but also to minimize it. Using a Japan made Victoreen, several kinds of X-rays and Co^<60> γ-rays were measured. The values obtained in case the whole chamber was irradiated were compared with those in case only the ionization chamber was irradiated and the difference between the two was concidered to be stem leakage error. Repeated experiments revealed that the range of the error was efectively reduced when the change-terminal of the stem was packed with the insulater. It was also found that the higher the doses and harder the rays, the bigger the range of the error. Some chambers showed as much as 60% of error in measuring Co^<60>-rays. This was recluced to several percent, however, if the change terminal was packed with the insulater.
公益社団法人日本放射線技術学会の論文
1962-06-30