Sunna dosimeter: an integrating photoluminescent film and reader system; work in progress

A new radiation dosimeter, consisting of an optically-stimulated polymer fi lm containing a photofluorescent sensor, can serve as a routine dosimeter a nd radiographic imaging medium for high-dose applications in the absorbed d ose range 0.1-100 kGy. The flexible, colorless, opalescent film having a un iform thickness of 0.240 (+/- 0.005) mm or certain other films in the thick ness range 0.08-0.60 mm, are available in large batches. They can be read r apidly with a simple table-top spectrofluorimeter, excitation wavelength (l ambda = 450 nm) and emission wavelength (lambda = 670 nm), giving a type A uncertainty of dose evaluation of < +/- 5% at 95% confidence level. It supp lies either,single integrated dose readings or two-dimensional radiographic images with relatively high spatial resolution. The present work focuses o n the following gamma-ray response characteristics of the system: inter- an d intra-batch reproducibility, pre- and post-irradiation stability, and dep endence of dose interpretations on absorbed dose rate and irradiation tempe rature. (C) 1999 Elsevier Science Ltd, All rights reserved.