title: Corresponding dose response of radiographic film with layered gafchromic film.
abstract: This note investigates the dose response of layered HS Gafchromic film compared to Kodak EDR-2 radiographic film. Using five layers of HS type Gafchromic film a dose response greater than EDR-2 film is achieved at the peak wavelength (0.55 OD/Gy versus 0.3 OD/Gy for EDR-2 film). Even over a broader waveband of 30 nm, which is similar to that found in ultra bright LED scanners, the response was found to be 0.38 OD/Gy as opposed to 0.29 OD/Gy. Measurements averaged over the entire visible spectrum produce a relative dose response of 0.165 OD/Gy for five layer HS and 0.29 OD/Gy for EDR-2 film. Due to this high dose response that is achievable, the five layer HS could be used in applications where small doses are delivered to certain areas and a low dependence of energy response is required for measurement.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong. butsonm@iahs.nsw.gov.au
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Butson
authors.forename: Tsang
authors.initials: T
authors.lastname: Cheung
authors.forename: Peter K N
authors.initials: PK
authors.lastname: Yu
mesh_terms: D004307:Dose-Response Relationship, Radiation; D019544:Equipment Failure Analysis / Q000379:methods*; D005373:Film Dosimetry / Q000145:classification / Q000295:instrumentation* / Q000379:methods; D008422:Materials Testing / Q000379:methods*; D019047:Phantoms, Imaging; D011786:Quality Control; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation*; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity