Experimentally determined values of x-ray backscatter factors are presented in this paper. Measurements were made for x-rays generated at voltages between 60 kV and 300 kV and three water phantoms different in shape and size. To study the influence of the irradiation geometry on the backscatter factors, the measurements were performed for different photon beam field diameters at the phantom front face, at a fixed source-to-phantom distance of 1 m. An ionization chamber of volume 1 cm3 was used for dose measurement. Measured results are analysed and discussed in comparison with measured and calculated values given in the cited references.
The calibration coefficient for radon measurements using a LR-115-II detector in a diffusion chamber was determined. Deposition of radon decay products on the inner chamber walls influenced the track density distribution. It was assumed that 214Po was 100% deposited before decay; however, part of 218Po atoms decay before they can be deposited. The radial track density distribution depends on the partially deposited 218Po. This dependence was assumed in order to estimate the amount of deposited 218Po so that more realistic calibration coefficients for radon measurements could be determined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.