By David S. Chang, Foster D. Lasley, Indra J. Das, Marc S. Mendonca, Joseph R. Dynlacht (auth.)
This ebook is a concise and well-illustrated assessment of the physics and biology of radiation remedy meant for radiation oncology citizens, radiation therapists, dosimetrists, and physicists. It provides issues which are integrated at the Radiation treatment Physics and Biology examinations and is designed with the cause of providing details in an simply digestible layout with greatest retention in brain. The inclusion of mnemonics, ideas of thumb, and reader-friendly illustrations through the publication aid to make tricky recommendations more uncomplicated to know. Basic Radiotherapy Physics and Biology is a important reference for college students and potential scholars in each self-discipline of radiation oncology.
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Extra resources for Basic Radiotherapy Physics and Biology
12 years) ! 90Y (64 h). • 90Sr applicators may be used by themselves (such as in eye plaques), or the 90Y may be extracted for further use. (Such as in radioactive microspheres) • Transient equilibrium: When daughter half-life is only a little shorter than the parent half-life. 18 NATURALLY OCCURRING RADIOISOTOPES The daughter activity builds up as the parent activity decays. Eventually the daughter activity slightly exceeds the parent activity, and both curves decay together. ° During transient equilibrium, the daughter nuclide appears to have slightly more activity and the same half-life as the parent.
Because X-ray tubes are powered by alternating current (AC), the voltage is not constant, therefore kVp is the highest “peak” voltage. X-ray Tube Evolution • X-rays were first produced in the late 1800’s and were quickly utilized to treat cancer. • Gradually, these devices improved by better target systems and cooling the anode with either oil or water, often using a rotating anode. 1). 27 PRODUCTION AND PROPERTIES OF RADIATION Cobalt-60 Radiotherapy • Teletherapy ° Historically, external beam radiotherapy was delivered by x-ray tubes, which deposited most of the dose to the skin.
Therefore, one gram of water is similar to one gram of fat or bone. ° This is independent of Z and therefore less sensitive to bone, lead, and other higher-Z materials. ° This makes Compton effect most useful for delivering a uniform dose in radiotherapy. ° It is bad at producing a sharp image of bone and tissue. 02 MeV and above. • Dominant Interaction at: 10 MeV and above (Fig. 5). 02 MeV (usually much more) interacts with the electric field of an atomic nucleus, and explodes into an electron and a positron (evil anti-electron in figure).