LiBe-14: A novel microdosimeter using LiF and BeO thermoluminescence dosimeter pairs for clinical and aerospace applications

A LiF and BeO TLD based microdosimeter for space radiation risk assessment of astronauts

“…The commercially available TEPC (Model REM 500B; Supplier Health Physics Instruments, Goleta, CA 93177, U.S.A.) based on a 597 mm diameter spherical Rossi Counter (RC) was used in this work (figure 2). The counter was filled with tissue-equivalent Propane gas at 1.77kPa pressure emulating a 2 µm diameter biological cell volume [8]. Pairs of TLD-700 and BeO were attached to the TEPC and exposed to secondary (lateral) radiation field produced by bombarding a polystyrene plate phantom with protons of various energies (figure 2).…”

“…Hence, BeO and 7 LiF: Mg,Ti, (TLD-700) pairs cross-calibrated using a TEPC could be used as a passive microdosimeter, i.e. surrogate of a much larger gas-filled TEPC [8,13].…”

“…The calibration procedure for the LiBe-14 microdosimeter is described in detail elsewhere [8] and depicted in figure 2. Eight batches of TLD chips each consisting of pairs of TLD-700 and BeO dosimeters were packed in small holders (18 mm × 15 mm) made of dark (light-tight) Mylar (tissue equivalent) sheet (0.3 mm thick).…”

“…To circumvent above limitations a tiny passive microdosimeter (LiBe-14) based on 7 LiF: Ti,Mg (TLD-700) and BeO (Thermolux 995) TLD chips was developed [8]. The LiBe-14 microdosimeter was cross calibrated against a REM500B TEPC using the mixed radiation fields produced by bombarding a polystyrene phantom with high-energy protons with different energies from PRO-TEUS 235 Medical Cyclotron at West German Proton Therapy Centre Essen, Germany.…”

Thermoluminescence Glow Curve Analysis of Thermoluminescent Na-Doped BeO Phosphor Using a Postannealing Method with Very Low Heating Rate

“…(3) Since then, there have been many reports on the properties and applications of thermoluminescent phosphors based on BeO. (4)(5)(6)(7)(8) However, there have been only a few reports on TL glow component analysis, despite this being necessary to understand the physical characteristics of TL based on BeO. Nieto et al reported studies on the kinetic parameters of undoped BeO using an isothermal decay method, for which the calculated activation energy (E) was in agreement with that obtained using the TL glow curve shape with Chen's modified method; however, the frequency factor (s) differed considerably due to the inclusion of an experimental error.…”