Dose response of commercially available optically stimulated luminescent detector, AL2O3:C for megavoltage photons and electrons

Abstract

This study examined the dose response of an optically stimulated luminescence dosemeter (OSLD) to megavoltage photon and electron beams. A nanoDot™ dosemeter was used to measure the dose response of the OSLD. Photons of 6-15 MV and electrons of 9-20 MeV were delivered by a Varian 21iX machine (Varian Medical System, Inc. Milpitas, CA, USA). The energy dependency was <1 %. For the 6-MV photons, the dose was linear until 200 cGy. The superficial dose measurements revealed photon irradiation to have an angular dependency. The nanoDot™ dosemeter has potential use as an in vivo dosimetric tool that is independent of the energy, has dose linearity and a rapid response compared with normal in vivo dosimetric tools, such as thermoluminescence detectors. However, the OSLD must be treated very carefully due to the high angular dependency of the photon beam.

Risk of second cancer from scattered radiation of intensity-modulated radiotherapies with lung cancer

“…RPLGD has relatively good reproducibility at about 1% and low energy dependency, at higher than 200 keV energy [23-27]. In addition, RPLGD has relatively small incident beam angular dependency, and low toxicity inside the human body, compared with a TLD or optically stimulated luminescence dosimeter (OSLD) [28-30]. A geometrical shape of RPLGD is a rod with 0.15 cm of the diameter and 0.85 cm length.…”

AAPM TG 191: Clinical use of luminescent dosimeters: TLDs and OSLDs

“…Current commercial OSLDs are in a disk‐type form, which can introduce angular dependence for geometrical reasons when comparing an edge‐on irradiation to an en‐face irradiation, as electrons may preferentially scatter out of the thin but relatively high‐density disk with an edge‐on irradiation. At megavoltage energies, mixed results have been found between edge‐on and en‐face signal per dose, ranging from 0% to 1%, 2% , and 4%). Detailed Monte Carlo simulations supported that there is a 2% effect at 6 MV .…”

Application of a radiophotoluminescent glass dosimeter to nonreference condition dosimetry in the postal dose audit system

“…Because OSLD have been widely implemented [10][11][12][13] and have similar characteristics to RGDs, it is worthwhile to compare the benefits and disadvantages between the two kinds of dosimeters. The OSLDs also contain aluminum, which is a high-atomic-number material; therefore, OSLDs are expected to have similar characteristics to RGDs with respect to a high response to low-energy x-rays.…”

“…The other characteristics such as reproducibility, linearity, and energy dependence seemed to be comparable with other reports. [10][11][12][13][14][15][16] However, RGD has some advantages compared with OSLD such as a reduced fading effect [negligible for RGD, but about 2.5% in 30 days for OSLD (Ref. 15)] and a reduced depletion effect [about 1.5% in 100 readings for RGD, but about 3% in 100 readings for OSLD (Ref.…”