Monte Carlo calculation of beam quality correction for solid‐state detectors and phantom scatter correction at (137)Cs energy

Beam quality correction [Formula: see text] , which reflects the absorbed energy dependence of the detector, is calculated for solid‐state detector materials diamond, LiF, [Formula: see text] , and [Formula: see text] for the [Formula: see text] RTR brachytherapy source using the Monte Carlo‐based EGSnrc code system. The study also includes calculation of detector‐specific phantom scatter corrections [Formula: see text] for solid phantoms such as PMMA, polystyrene, RW1, solid water, virtual water, and plastic water. Above corrections are calculated as a function of distance r along the transverse axis of the source. [Formula: see text] is about unity for the [Formula: see text] detector. LiF detector shows a gradual decrease in [Formula: see text] with r (decrease is about 2% over the distance range of 1‐15 cm). Diamond detector shows a gradual increase in [Formula: see text] with r (about 3% larger than unity at 15 cm). In the case of [Formula: see text] detector, [Formula: see text] decreases with r steeply (about 14% over the distance range of 1‐15 cm). The study shows that some solid‐state detectors demonstrate distance‐dependent [Formula: see text] values, but the degree of deviation from unity depends on the type of solid phantom and the detector. PACS number: 87.10.Rt, 87.53.Bn, 87.53.Jw, 87.56.Bg