放射線治療時の生殖腺被曝線量(第三報) : 甲状腺機能亢進症の131I治療時の生殖腺被曝線量

抄録

The gonad dose was evaluated upon forty-six patients with the hyperthyroid treated with the therapeutic dose of ^<131>I, 2 to 20mCi, These forty-six patients have been derived from all the out-patients, 15787 cases, visiting the Chiba University Hospital in recent twelve years. The gonadal exposure due to gamma rays of ^<131>I was directly measured by the pocket chambers placed close to the gonad of each patient, showing 0.35 to 0.4 rad per one mCi of ^<131>I the first 24 hours after the administration. Those of beta-rays, however, were approximately estimated at 0.3 rad per one mCi by using the specific activities of ^<131>I in the blood and the calculation. The fundamental experiment concerning the gonadal exposure was perfomed with a body-sized phantom containing ^<131>I solution, suggesting that ^<131>I excreted into the bladder had gave considerable contribution to the gonad dose.