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Miller / Dosimetry Systems for Radiation Processing Table 2. The nominal dose ranges for PCR dosimeters. 8. Radiochromic Films (ISO/ASTM 51275) The radiochromic dye film dosimeters (RCD) are of freestanding or coated polymeric thin films, which are colorless prior to irradiation. They are usually supplied as small squares, strips, or long rolls or sheets that can be cut into a convenient size for dosimetry. For routine (and reference) dosimetry, these dosimeters are usualy proteced in moisture-proof pouches, while for dose mapping the dosimter are used without protection.
Sheet material with thickness in the range of 1 to 4 mm is cut into plaques of a convenient size for spectrophotometric measurement, for example 12 x 38 mm. The dosimeters are sealed in pouches in order to protect them against changes in humidity and to protect the surfaces for optical measurement. Commercially available dosimeters collectively spans a dose range of 100 Gy to 100 kGy as given in Table 1. PMMA dosimeters are used as routine dosimeters mainly in gamma irradiation facilities, however the response of PMMA dosimeters show some degree of instability after irradiation and they are therefore not suitable for reference transfer dosimetry.
Dmin is necessary to calculate the irradiation time. Obviously Dmin has to be greater or at least equal to Sterilization Dose. Dmax is important for evaluation of radiation resistance of treated and packaging materials. C. Ponta / Process Control of Radiation Treatment Figure 5. Dose mapping Dmin and Dmax are positioned in different planes of the tote-box. It is important to notice that for a given stuff in an established packaging arrangement, exposed in a given irradiation field, Dmin and Dmax are not independent variables.