Leakage test of Ir-192 sealed radiation sources for non-destructive testing

Leakage tests were performed to verify the leak tightness of Ir-192 sealed radiation source for industrial non-destructive testing. Three Ir-192 sealed sources having radioactivity more than 50 Ci were made using research reactor HANARO of Korea Atomic Energy Research Institute. Tests were performed according to the leakage test criteria of domestic nuclear regulations and test standards of IAEA and ISO. As a test method, hot liquid immersion test was adopted to evaluate the leak activity of three Ir∼192 sealed sources having radioactivity of 56.2, 50.5, 51.2 Ci. Activities detected after immersion test of each sources showed 52.12, 9.71, 5.71 Bq and these values were very low compared to the safety criteria of sealed source leakage, 1,850 Bq(50 nCi). Through this study, it was verified that leak tightness and source capsule integrity of Ir-192 sealed NDT sources produced in HANARO