Effects of read-out light sources and ambient light on radiochromic film.
Both read-out light sources and ambient light sources can produce a marked effect on coloration of radiochromic film. Fluorescent, helium neon laser, light emitting diode (LED) and incandescent read-out light sources produce an equivalent dose coloration of 660 cGy h(-1), 4.3 cGy h(-1), 1.7 cGy h(-1) and 2.6 cGy h(-1) respectively. Direct sunlight, fluorescent light and incandescent ambient light produce an equivalent dose coloration of 30 cGy h(-1), 18 cGy h(-1) and 0 cGy h(-1) respectively. Continuously on, fluorescent light sources should not be used for film optical density evaluation and minimal exposure to any light source will increase the accuracy of results.
Butson
M J
MJ
City University of Hong Kong, Department of Physics and Materials Science, Kowloon Tong.
Yu
P K
PK
Metcalfe
P E
PE
D002138:Calibration; D005373:Film Dosimetry / Q000295:instrumentation / Q000379:methods; D005453:Fluorescence; D007834:Lasers; D008029:Lighting; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013472:Sunlight