Monte Carlo investigation of energy response of various detector materials in and brachytherapy dosimetry

摘要

Relative absorbed‐dose energy response correction R for different detector materials in water, PMMA and polystyrene phantoms are calculated using Monte Carlo‐based EGSnrc code system for and brachytherapy sources. The values of R obtained for source are 1.41, 0.92, 3.97, 0.47, 8.32 and 1.10, respectively, for detector materials LiF, , diamond, silicon diode and air. These values are insensitive to source‐to‐detector distance and phantom material. For source, R is sensitive to source‐to‐detector distance for detector materials other than air and . For silicon, R increases from 3 to 4.23 when depth in water is increased from 0.5 cm to 15 cm. For source, the values of R obtained for air and in PMMA and polystyrene phantoms are comparable to that obtained in water. However, LiF, Si and show enhanced response and diamond shows decreased response in PMMA and polystyrene phantoms than in water. PACS number: 87.53.Jw