4. 医療における放射線管理のための測定の現状と技術的問題 : 第44回総会シンポジウム : 診療用放射線の安全管理

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A questionnaire was sent out for the purpose of trying to grasp the existing state of radiation measurement among the medical and dental school hospitals. It was pointed out that the accuracy of measurement regarding the X-ray examination is not better than therapeutics part concerning both standard and survey measurements. The reason for this is supposed due to the unsatisfactory dependence on the low energy using in the measuring instruments. The effect of energy on measurements and the dose equivalent at a 1 cm depth were discussed. 2) The back scatter radiation to the film badge is slightly effected by the X-ray energy. It is constant when the distance between the phantom and film badge is under 3 cm and reduced over 3 cm. By adopting ICRP Pub. 26 in the near future, the dose equivalent at a 1 cm depth should be mearsured in order to provide radiation protection. It is considered that the calbilation will be made using a phantom. If the caliblation is made at 3 cm distance between the phantom and film badge, the dose equivalent at 1 cm depth will be underestimated when the film badge is put at a distance of over 3 cm from the body. 3) The availability of silicon photodiode as a sensor was considered by the method in which an X-ray is directly exposured to one. The energy spectrum can be detected over the 15-200 keV range. It has been concluded that the usage of this sensor can calculate the dose equivalent at a 1 cm depth for lower energy radiation as using clinical examination.
公益社団法人日本放射線技術学会の論文
1988-10-01

4. 医療における放射線管理のための測定の現状と技術的問題 : 第44回総会シンポジウム : 診療用放射線の安全管理

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