Beta induced Bremsstrahlung exposure in DNA and RNA

The Bremsstrahlung exposure induced by some of the therapeutic beta nuclides (90Y, 143Pm, 169Er, 204Tl, 210Bi, 89Sr, 45Ca and 131I) in DNA and RNA has been calculated by extending the national council for radiation protection model. It has estimated the specific Bremsstrahlung constant (ΓBr), Probability of energy loss by beta during Bremsstrahlung emission (PBr) and Bremsstrahlung activity (Arelease)Br. The estimated Bremsstrahlung activities of pure beta nuclides in DNA and RNA are extremely large (102 GBq-106 GBq). The patients receiving such nuclides would never receive that much activity because of prohibitive radiation toxicity (few 100 MBq). Thus the patients receiving these pure beta emitting nuclides do not have to be hospitalized for radiation precautions. It is also estimated the Bremsstrahlung yield (IBr) for wide energy range (0.01 MeV-100 MeV) using the tabulated values given for elements by Lucien pages. The variation of IBr as a function of incident electron energy is shown graphically. This data may be useful in the analysis of Bremsstrahlung dose where beta emitting nuclide is involved in medical therapy.