Characterization of a two-dimensional, thermoluminescent, dose-mapping system: Uniformity, reproducibility, and calibrations
- Sandia National Labs., Albuquerque, NM (United States)
- International Sensor Technology, Inc., Pullman, WA (United States)
Initial testing of a new, commercially available, thermoluminescent dosimetry (TLD) system is reported. The radiation detectors consist of two-dimensional arrays of 10{sup 4} CaF{sub 2}:Mn dosimeters, deposited on flexible polyimide sheets. The spatial resolution is 3 mm, and the combined thickness of the dosimeters and the substrate is 185 {mu}m. Exposed sheets are processed by laser heating. This system is compatible with intense, pulsed bremsstrahlung fields and electronics hardness-testing. A two-step calibration procedure will be described. In spatial uniformity tests at 66 Gy the detectors exhibited random fluctuations of 1--3% superposed on broad spatial drifts of {approximately} {+-}5%. Reproducibility for strips of 288 elements, cut from sheets and given absorbed doses of 10 Gy, was {approximately} 2%. For absorbed doses in the 10 Gy--1.5 kGy range, response vs. exposure curves show reasonable features of linearity, supra linearity, and saturation for CaF{sub 2}:Mn phosphor. Small systematic effects (< 7%) can be observed for sheets and strips stacked during exposure; these effects are explained by radiation transport calculations and impact the dosimetric technique.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 46186
- Report Number(s):
- CONF-940604--; ISBN 0-7803-2006-9
- Country of Publication:
- United States
- Language:
- English
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