Effect of repeated high dose exposure on the background count and sensitivity of TLD cards

The present work was carried out in order to see the variation in the background count after repeated exposure to high doses. In view of the fact that the cards were to be subjected to high doses, cards which were not acceptable for service were used in the study. Therefore, the observed standard deviations are higher than that of service cards. However, it is anticipated that the results will give an idea of the change in background counts and sensitivity of the cards. TLD cards loaded in cassette were exposed free-in-air geometry as per the routine personnel monitoring procedure