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Radiation Protection Dosimetry 33:95-98 (1990)
© 1990 Oxford University Press

Li2B4O7:Mn and CaSO4:Dy TL Preparations at PSPKR-BATAN, Indonesia, and their Dosimetric Properties

R. Abubakar, S. Untung and M. Oberhofer

In recent years at the Centre for Standardization and Radiological Research (PSPKR) of the National Atomic Energy Agency (BATAN), Indonesia, intensive efforts have been made to produce Li,2B4O7:Mn and CaSO4:Dy TL phosphors with dosimetric qualities in sufficient quantity to satisfy the national needs for such materials in hospitals (radiotherapy) and in the radiation protection field (personnel dosimetry and environmental radiation control). The production procedures are briefly described and the dosimetric characteristics presented in detail. The Li2B4O7:Mn phosphor can be used for doses as low as 0.06 Gy up to 104 Gy, where saturation occurs. Unlike other Li2B4O7:Mn preparations no supralinearity has been observed. Linearity consequently extends from 0.06 Gy up to 103 Gy. No fading of the dosimetric peak within the first three weeks is observed. The CaSO4 preparations are 15% more sensitive than the corresponding Harshaw material. Their lower threshold dose is 25 µGy and dose can be measured linearly from 1 mGy up to 102 Gy. Fading of the phosphor is 1 to 3% per month initially.


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