In permanent brachytherapy, tiny radioactive "seeds" are implanted directly into a tumor, such as in the treatment of localized prostate cancer. Iodine-125, which emits low-energy photon radiation, is commonly selected for these implants instead of a high-energy gamma-emitting isotope.
Explain one advantage of using an isotope that emits low-energy photons rather than high-energy gamma radiation for permanent implants.
23 exam-style questions on AQA A Level Physics Radionuclide imaging and therapy (A-level only), covering Imaging techniques (A-level only), Half-life (A-level only), Gamma camera (A-level only), Use of high-energy X-rays (A-level only), Use of radioactive implants (A-level only), and Imaging comparisons (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.