title: Effects of read-out light sources and ambient light on radiochromic film.
abstract: 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.
authors.affiliation: City University of Hong Kong, Department of Physics and Materials Science, Kowloon Tong.
authors.forename: M J
authors.initials: MJ
authors.lastname: Butson
authors.forename: P K
authors.initials: PK
authors.lastname: Yu
authors.forename: P E
authors.initials: PE
authors.lastname: Metcalfe
mesh_terms: 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