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Year : 2011  |  Volume : 34  |  Issue : 3  |  Page : 166-171

Bremsstrahlung dose of strontium-89 in therapy application

1 Department of Physics, Government College for women, Kolar, India
2 Shravana, PC Extension, Kolar, India
3 Department of Physics, Bangalore University, Bangalore, Karnataka, India

Correspondence Address:
H C Manjunatha
Department of Physics, Government College for women, Kolar
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.101700

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There has been an increased interest in strontium-89 (Sr-89) therapy, which emits relatively high-energy (1.495 MeV) beta rays. The production in vivo bremsstrahlung radiation sufficient for external imaging and this radiation hazard warrants evaluation. The bremsstrahlung (secondary radiation) of Sr-89 has been traditionally ignored in internal dosimetry calculation. We have estimated the bremsstrahlung dose of Sr-89 source in the muscle and bone to body the various body organs (such as adrenals, brain, breasts, gallbladder wall, LLI wall, small intestine, stomach, ULI wall, heart wall, kidneys, liver, lungs, muscle, ovaries, pancreas, red marrow, bone surfaces, skin, spleen, testes, thymus, thyroid, urine bladder wall, uterus, fetus, placenta, and total body) from distributed sources of Sr-89 in the muscle and bone. In the present study, muscle and bone is considered as source organs. The bremsstrahlung dose of Sr-89 source in a muscle is less than that of cortical bone. In both muscle and bone medium, bremsstrahlung dose decreases with distance. These estimated values show that the bremsstrahlung radiation absorbed dose contribution from an organ to itself is very small, but contribution to other organs is not always negligible especially when large amounts of Sr-89 may be involved as in therapy applications.

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