title: Absorbance measurement with a helium-neon laser for chemical dosimetry.
abstract: A laser-based system for absorbance measurement has been developed for use in chemical dosimetry as an alternative to the spectrophotometer. The system incorporating a Helium-Neon laser operating at 543.5 nm is designed specifically for measurement of absorbed doses below 10 Gy with the ferrous sulphate-benzoic acid-xylenol orange (FBX) dosimeter. Absorbance measurement for the FBX dosimeter is normally carried out at 540 nm with a spectrophotometer. The performance of the laser-based system in measurement of absorbance is comparable to that of a standard spectrophotometer and it is concluded that the absorbance measurement technique is not the limiting factor in the sensitivity of the FBX dosimeter for absorbed doses below 1 Gy.
authors.affiliation: Centre for Medical and Health Physics, Queensland University of Technology, Australia.
authors.forename: B J
authors.initials: BJ
authors.lastname: Tarte
authors.forename: T
authors.initials: T
authors.lastname: van Doorn
mesh_terms: D000042:Absorption; D006371:Helium; D007834:Lasers; D009356:Neon; D011874:Radiometry; D013053:Spectrophotometry
chemical_list: D006371:Helium; D009356:Neon