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Radiation Protection Dosimetry 101:145-148 (2002)
© 2002 Oxford University Press

Filtered X Ray Beam Dosimetry from 10-3 to 102 Gy Dose Range by using Phototransistors

L. A. P. Santos, E. F. da Silva Jr and E. Vilela

Low-cost, commercially available phototransistor-type semiconductor devices have been tested for monitoring filtered X ray beam dose. A Pantak X ray unit was used to generate aluminium filtered X ray beams from 60 to 120 kV potentials. The analysis of the radiation detection behaviour as a function of the X ray tube parameters (peak kilovoltage and electrical current) are presented. The changes of the phototransistor electronic parameters have been evaluated and the results indicate that phototransistors can be used as X ray detectors for dose estimation in two different ways: electrical current read-out from 1 to 100 mGy dose range, and the changing of the radiation detection sensitivity in the dose range from 0.1 to 100 Gy. In addition, the devices show high reliability with no sign of substantial performance degradation with use and, in certain dose ranges, the cumulative dose evaluations could be performed up to 10,000 times with no need for re-calibration.


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 Radiat Prot DosimetryHome page
L. A. P. Santos, F. R. Barros, J. A. Filho, and E. F. da Silva Jr
Precise dose evaluation using a commercial phototransistor as a radiation detector
Radiat Prot Dosimetry, September 1, 2006; 120(1-4): 60 - 63.
[Abstract] [Full Text] [PDF]


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