Feasibility study of using CaSO4:Dy phosphor for simultaneous estimation of exposure and time elapsed post-exposure

Samples of locally made CaSO4:Dy phosphor were investigated to study the feasibility of simultaneous estimation of exposure and time elapsed post-exposure. The glow curve behaviour relative to absorbed dose, radiation energy, ambient temperature and time were studied in detail. An attempt was made using the variation of the glow peak ratio P2/P1 to estimate the time elapsed after an accident exposure. Results indicate that the limitation for the successful estimation of this elapsed time seems to be the temperature sensitivity of the peak ratios. (author)