Investigation of bremsstrahlung (braking radiation) from beta-emitting radiative sources used in medical fields

Usage of high energy charged particles for diagnosis and treatment has been widespread in medicine. The main purpose is to investigate that Bremsstrahlung which occurs by tissue interactions with charged particles should not be neglected. Nuclear stopping power (Bremsstrahlung) was calculated for lung, brain, skin, muscle, bone (cortical) and water targets for the energies of electrons obtained from LINAC used in radiotherapy and of ß+ sources used in positron emission tomography (PET). These calculations were done by using the four different analytical functions including classical Bethe Bloch, Tsoulfanidis, modified Bethe Bloch and modified Tsoulfanidis equations. The results were compared with that of National Institute of Standards and Technology (NIST-ESTAR).