抄録
The author made measurement of the distribution of scattered radiation and the radiation dosage received by several exposed portions of the roentgenoscopists and the nurses assisting before and after the improvement of protecting devices of the roentgenoscopic table. A ratemeter was used for the former and pocket dosimeter and film badge for the latter.
Results
1. During the roentgenoscopy before improvement a large amount of scattered radiation was measured, and in some places more than 1, 000mr/hr were reached near the position of the roentgenoscopists and the nurses assisting.
2. After the improvement scattered radiation decreased markedly.
3. A considerable ration leakage was measured around the X-ray tube vessel, and on the tube there were some places which presented 500mr/hour of dosage.
4. In some places the scattered radiation from the roentgenoscopic table and the patients were protected by means of metal parts of the roentgenoscopic table.
5. After the improvement the radiation dosage received by roentgenoscopists and nurses assisting decreased from bout one fiftieth to one sixtieth, therefore the purpose of improvement was achieved. But it is so dangerous to insert a hand behind the fluorescent screen to palpate patient's body, that it is nonesense to improve the protecting devices, if the roentgenoscopists do not pay attention to the above mentioned
