The use of the Monte Carlo simulation technique for the design of an H*(10) dosemeter based on TLD-100.
The thermoluminescence (TL) detector material LiF:Mg,Ti (TLD-100) and appropriate filter materials were combined in order to design a passive dosemeter measuring the operational quantity ambient dose equivalent, H*(10), for monitoring low-dose external photon radiation fields. Using the Monte Carlo simulation technique, optimisations of energy dependent conversion coefficients from air kerma free-in-air compared to ICRU and ISO proposed values. h*K(10), were performed by varying dosemeter detector positioning. geometrical arrangements, and filter materials. Deviations smaller than 5% compared to h*K(10) between 30 keV and 2.5 MeV of primary photon energies were achieved by a dosemeter design consisting of a 15 microm Sn metal layer and a 5 mm PMMA layer surrounding the LiF detector. Subsequently performed free-air verification experiments carried out in well defined standard photon radiation fields showed an obviously TL-specific effect. An underestimation up to -15% of the modelled data at low photon energies was observed.
Hranitzky
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Department of Radiation Protection, Austrian Research Centers Seibersdorf. CHRISTIAN.HRANITZKY@ARCS.AC.AT
Stadtmann
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Kindl
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D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D003198:Computer Simulation; D008094:Lithium; D008274:Magnesium; D009010:Monte Carlo Method; D017785:Photons; D019904:Polymethyl Methacrylate; D013819:Thermoluminescent Dosimetry / Q000379:methods*; D014025:Titanium; D014965:X-Rays
D000396:Air Pollutants, Radioactive; D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D019904:Polymethyl Methacrylate; D008094:Lithium; D014025:Titanium; D008274:Magnesium