Uncertainty Analysis of Hp(10)meas/Hp(10)del Ratio for TLD–100H at Energy 24–1250 keV

Abstract

The Hp(10) of an ideal TLD is independent of photon energy. This is to say that at any photon energy, the ratio R of the measured dose Hp(10)meas to the delivered dose Hp(10)del is always 1. In practice however the Hp(10) is dependent on the energy and R is not equal to 1. For this reason, ICRP has set the lower limit LL and upper limit UL for R as 0.55≤R≤1.63 for detection limit of 0.1 mSv and Hp(10)del=1 mSv. As R is the quantity arises from the measurement processes, the existence of uncertainty of R, i.e. ΔR is inevitable. In the boundary cases, such as when R is slightly lower than LL or slightly larger than UL, ΔR would serve a useful quantity in decision making either to accept or to reject the value of R. The purpose of the present work is to estimate ΔR for the TLD–100H for photon energy of 24–1250 keV. The estimation of ΔR is based on the error propagation method. For the eleven photon energies, this work obtained (a) R in the range of 0.77 to 1.16, (b) ΔR in the range of ± 0.02 to ± 0.04. The values of R were satisfactory as they complied the ICRP limit. The determined ΔR is considered very small as it is in the order of 3% in comparison of R.

Response of LiF: Mg, Cu, P TL Detector Simulated with Geant4

“…The experimental set-up that was used to get energy response from TLD-100H was almost similar to Figure 1. The exact diagram of the set-up was described elsewhere (Priharti et al 2013(Priharti et al , 2012. During the irradiation, four TLD badges were positioned at the front surface (centre point) of the water phantom and two TLD were used as background control (not being irradiated).…”

“…As mentioned earlier this second stage of the work was to simulate the experimentally obtained energy response. The input for the simulation can be divided into two parts: the details of the TLD badge; and the details of the set-up (Priharti et al 2013(Priharti et al , 2012. Figures 2 and 3 describe the information needed for the input in part (i), they are: TLD circular chip with 3.6 mm diameter and 0.38 mm thickness; TLD rectangular card with dimension 4.1×3.1×0.2 cm 3 ; TLD rectangular badge with dimension 6.85×4.11×0.68 cm 3 ; TLD filter with thick dome made by 107 mg/cm 2 ABS + 893 mg/cm 2 PTFE.…”

Geant4 Simulation of Number of Event Effect on the TLD LiF: Mg, Cu, P Energy Response

“…Radiation workers widely use it as a badge type personal dosimeter to monitor the cumulative radiation doses received over periods of weeks or months [2]. This dosimeter can measure the whole body dose [Hp (10)] and skin dose [Hp(0.07)] from X-ray and gamma radiation (energy range <12 keV -3 MeV) [3]. Because of its broad energy coverage, TLDs are also widely used in environmental monitoring and diagnostic examinations [4].…”

Determination of Fano Factor and Pre-amplifier Noise from the Measurement of Energy Resolution of a HPGe Detector

“…If Δm is the uncertainty in m, the Fano factor and its uncertainty may be calculated (Priharti et al 2013;Samat & Evans 1992) from…”