Title :
Measurement of centi-Gray X-ray dose levels with radiochromic film
Author :
Cheung, Tsang ; Yu, Peter K N ; Butson, Martin J.
Author_Institution :
Dept. of Phys. & Mater. Sci., City Univ. of Hong Kong, Kowloon, China
Abstract :
X-ray doses in the range of centi-Gray can be detected and accurately measured on a relative scale for low energy X-rays using a high sensitivity radiochromic film stack. Gafchromic XR type T radiochromic film has been investigated to analyze its ability to measure relative doses below 50 cGy for 100-kVp X-rays using a layered technique. Investigations showed that a 4-layer film stack could produce reproducible results at 50-cGy relative applied dose to within 3% and to within 12% for 5-cGy applied dose. The combination of single sheet higher film sensitivity to low energy X-rays along with a layered film dosimetry technique provides the ability to adequately measure low relative absorbed doses less than 50 cGy if required.
Keywords :
X-ray detection; dosimetry; Gafchromic XR type T radiochromic film; X-ray doses; high sensitivity radiochromic film stack; layered film dosimetry technique; layered technique; Biomedical optical imaging; Calibration; Dosimetry; Energy measurement; Imaging phantoms; Optical films; Optical saturation; Optical sensors; Physics; Wavelength measurement; Absorption spectra; gafchromic XR type T; low dose; radiation dosimetry; radiochromic film;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2005.858209