A study of dosimetry characteristics of GAF DM-1260 radiochromic films

The dosimetric characteristics of gamma-ray, x-ray and electron irradiated GAF-DM-1260 radiochromic film have been studied, and the dependence of radi ation-induced film absorbance on irradiation temperature and reading temper ature and the changes of the absorption spectrum peaks at different reading temperatures and absorbed doses (3 x 10(1) to 5 x 10(4) Gy) are reported. It is shown that the responses are independent of the gamma-ray dose rate i n the dose rate range considered in the experiment. The film response chara cteristics as a function of the absorbed dose to Co-60 gamma irradiation at the spectrophotometric reading wavelengths of 400, 580, 600, 650 and 670 n m and two absorption peaks are determined as well as the response character istics to the electron beam at the reading wavelength of 400 nm. The result s demonstrate that the film responses to gamma rays, x-rays and a 3.8 MeV e lectron beam are equivalent, over the absorbed dose rate range of about 0.8 Gy.s(-1) to 5 x 10(8) Gy.s(-1). Some advice and points of view about the d osimetric characteristics of the film and some problems in usage are provid ed according to the experimental results. (C) 2000 Elsevier Science Ltd. Al l rights reserved.