Monte Carlo study of mosfet packaging, optimised for improved energy response: Single mosfet filtration

Mohd. Amir Radhi Othman, D. L. Cutajar, N. Hardcastle, S. Guatelli, A. B. Rosenfeld

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Monte Carlo simulations of the energy response of a conventionally packaged single metal-oxide field effect transistors (MOSFET) detector were performed with the goal of improving MOSFET energy dependence for personal accident or military dosimetry. The MOSFET detector packaging was optimised. Two different 'drop-in' design packages for a single MOSFET detector were modelled and optimised using the GEANT4 Monte Carlo toolkit. Absorbed photon dose simulations of the MOSFET dosemeter placed in free-air response, corresponding to the absorbed doses at depths of 0.07 mm (Dw(0.07)) and 10 mm (Dw(10)) in a water equivalent phantom of size 30 × 30 × 30 cm3 for photon energies of 0.015-2 MeV were performed. Energy dependence was reduced to within ±60 % for photon energies 0.06-2 MeV for both Dw(0.07) and Dw(10). Variations in the response for photon energies of 15-60 keV were 200 and 330% for Dw(0.07) and Dw(10), respectively. The obtained energy dependence was reduced compared with that for conventionally packaged MOSFET detectors, which usually exhibit a 500-700% over-response when used in free-air geometry.

Original languageEnglish
Article numberncq144
Pages (from-to)10-17
Number of pages8
JournalRadiation Protection Dosimetry
Volume141
Issue number1
DOIs
Publication statusPublished - 11 May 2010

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Product Packaging
Photons
packaging
field effect transistors
Air
detectors
photons
energy
Oxides
Accidents
Metals
dosage
air
accidents
Water
dosimeters
metal oxides
simulation
geometry
water

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Radiation
  • Public Health, Environmental and Occupational Health

Cite this

Monte Carlo study of mosfet packaging, optimised for improved energy response : Single mosfet filtration. / Othman, Mohd. Amir Radhi; Cutajar, D. L.; Hardcastle, N.; Guatelli, S.; Rosenfeld, A. B.

In: Radiation Protection Dosimetry, Vol. 141, No. 1, ncq144, 11.05.2010, p. 10-17.

Research output: Contribution to journalArticle

Othman, Mohd. Amir Radhi ; Cutajar, D. L. ; Hardcastle, N. ; Guatelli, S. ; Rosenfeld, A. B. / Monte Carlo study of mosfet packaging, optimised for improved energy response : Single mosfet filtration. In: Radiation Protection Dosimetry. 2010 ; Vol. 141, No. 1. pp. 10-17.
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