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

The H p (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 H p (10) meas to the delivered dose H p (10) del is always 1. In practice however the H p (10) is dependent on the energy and R is not equal to 1. For this reason, ICRP has set the lower limit L L and upper limit U L for R as 0.55≤ R ≤1.63 for detection limit of 0.1 mSv and H p (10) del =1 mSv. As R is the quantity arises from the measurement processes, the existence of uncertainty of R , i.e. Δ R is inevitable. In the boundary cases, such as when R is slightly lower than L L or slightly larger than U L , Δ R 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 Δ R 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) Δ R in the range of ± 0.02 to ± 0.04. The values of R were satisfactory as they complied the ICRP limit. The determined Δ R is considered very small as it is in the order of 3% in comparison of R .