By David S. Chang, Foster D. Lasley, Indra J. Das, Marc S. Mendonca, Joseph R. Dynlacht
This ebook is a concise and well-illustrated overview of the physics and biology of radiation treatment meant for radiation oncology citizens, radiation therapists, dosimetrists, and physicists. It offers issues which are integrated at the Radiation treatment Physics and Biology examinations and is designed with the reason of providing info in an simply digestible structure with greatest retention in brain. The inclusion of mnemonics, principles of thumb, and reader-friendly illustrations during the booklet support to make tough suggestions more uncomplicated to understand. simple Radiotherapy Physics and Biology is a helpful reference for college students and potential scholars in each self-discipline of radiation oncology.
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Extra info for Basic Radiotherapy Physics and Biology
It is worth noting that there is a strong magnetic field guiding the wave-guide structure to ensure the electrons move in a straight line with a diameter of about 2 mm (Fig. 3). 29 PRODUCTION AND PROPERTIES OF RADIATION Head of the linear accelerator Bending magnet Klystron wave Guide accelerator tube High energy electron beam Tungsten target causes Bremsstrahlung photons with energies ranging from 0 up to the energy of the incoming electron beam Primary collimator directs the photon beam into a focused direction lon chamber Flattening filter Multileaf collimator (tertiary collimator) further shapes the final field shape Secondary collimator (independent jaws) determine field size Fig.
2), causing some secondary particles and residual radioactivity.
The daughter activity builds up over time, until it is roughly equal to the parent activity. ° You can only produce the daughter nuclide as fast as the parent will decay, so the activity (disintegrations per second) is bottlenecked at the first step. • After the buildup period, the apparent activity and half-life of the daughter are basically the same as the parent. ° EXAMPLES: • 226Ra (half-life 1,620 years) ! 8 days) • 222Rn is much more active than 226Ra. • Radium needles are composed of a platinum tube full of radium salts that decay into radon gas that is trapped in the tube.
Basic Radiotherapy Physics and Biology by David S. Chang, Foster D. Lasley, Indra J. Das, Marc S. Mendonca, Joseph R. Dynlacht