PMID: 9434295Jan 22, 1998Paper

The response of a MOSFET, p-type semiconductor and LiF TLD to quasi-monoenergetic x-rays

Physics in Medicine and Biology
C R EdwardsP J Mountford

Abstract

A metal oxide semiconductor field effect transistor (MOSFET), p-type semiconductor and a TLD can all be used for x-ray dosimetry, with each system having the common disadvantage of a response which is dependent upon the incident photon energy, particularly for energies < 1 MeV. A Pantak HF-320 quasi-monoenergetic x-ray unit was used to determine the response of two Thomson and Nielson TN-502RD MOSFETs, a Scanditronix EDP-10 semiconductor (build-up cap 10 mm: tissue equivalence), an EDD-5 semiconductor (build-up cap 4.5 mm: tissue equivalence) and an Lif:Mg:Ti TLD over the energy range 12-208 keV. The sensitivity of each detector was normalized to the value produced by exposure to 6 MV x-rays. The maximum relative sensitivities of the two MOSFET detectors were 4.19 +/- 0.25 and 4.44 +/- 0.26 respectively, occurring at an incident x-ray energy of 33 keV. The maximum relative sensitivity of the Scanditronix EDP-10 of 2.24 +/- 0.13 occurred at 65 keV, and for the EDD-5, it was 7.72 +/- 0.45 at 48 keV. The TLD produced a maximum relative sensitivity of 1.31 +/- 0.09 at 33 keV. Compared with available data based on heteroenergetic x-ray sources, these measurements have identified a more representative response for each detector to lo...Continue Reading

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Citations

Apr 30, 2009·Australasian Physical & Engineering Sciences in Medicine·T CheungP K N Yu
Jan 1, 2008·Radiological Physics and Technology·Ryosuke KohnoTakashi Ogino
Feb 24, 1999·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·P J Mountford, M J O'Doherty
May 13, 2010·Radiation Protection Dosimetry·M A R OthmanA B Rosenfeld
Jul 4, 2002·Medical Physics·Cynthia F ChuangPing Xia
Sep 16, 2009·The British Journal of Radiology·C R Edwards, P J Mountford
Oct 31, 2007·The British Journal of Radiology·C R EdwardsA J Moloney
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Jan 20, 2004·Physics in Medicine and Biology·Zhongli CaiLéon Sanche
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Oct 29, 2004·Physics in Medicine and Biology·C R Edwards, P J Mountford
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