Monte Carlo investigation of energy response of various detector materials in [Formula: see text] and [Formula: see text] brachytherapy dosimetry

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 [Formula: see text] and [Formula: see text] brachytherapy sources. The values of R obtained for [Formula: see text] source are 1.41, 0.92, 3.97, 0.47, 8.32 and 1.10, respectively, for detector materials LiF, [Formula: see text] , diamond, silicon diode and air. These values are insensitive to source‐to‐detector distance and phantom material. For [Formula: see text] source, R is sensitive to source‐to‐detector distance for detector materials other than air and [Formula: see text]. For silicon, R increases from 3 to 4.23 when depth in water is increased from 0.5 cm to 15 cm. For [Formula: see text] source, the values of R obtained for air and [Formula: see text] in PMMA and polystyrene phantoms are comparable to that obtained in water. However, LiF, Si and [Formula: see text] show enhanced response and diamond shows decreased response in PMMA and polystyrene phantoms than in water. PACS number: 87.53.Jw