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Physical, technological and organizational bases of radiation medicine. Prof. Igor Y. Galaychuk, MD Head, Department of Oncology & Radiology Ternopil State Medical University. Physics of Radiation. Proton - positive charge, in the nucleus. Neutron - neutral (no) charge, in the nucleus.
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Prof. Igor Y. Galaychuk, MD
Head, Department of Oncology & Radiology
Ternopil State Medical University
Proton - positive charge, in the nucleus.
Neutron - neutral (no) charge, in the nucleus.
Electron - negative charge, orbits the nucleus.
Radiation - Radiation is energy in the form of waves or particles given off during radioactive decay, or as a consequence of certain physical processes that we can control. Examples of these are x-ray machines and particle accelerators.
Wave radiations include gamma and x-rays. A common term used to describe this type of radiation is photon radiation.
Particle radiation can consist of charged or uncharged particles which are emitted with very high velocity.
Radioactive contamination - contamination is radioactive material that is in a form or location which may allow it to be spread to unwanted locations. Many radioactive sources are sealed or are in a form that isolates the material from potential spread. Contamination may be Fixed, Transferable (loose), or Airborne.
Radioactivity - Radioactivity is the process of unstable (or radioactive) atoms becoming stable by emitting radiation. The radioactive decay process involves fundamental physical constants which enable us to characterize and measure radioactive materials very accurately.
The International System of Units (or SI units) includes the gray, sievert, and becquerel:
1 gray (Gy) = 100 rad, 1 milligray (mGy) = 0.1 rad, 1 rad = 1 centigray (cGy)
The answer follows:
Equivalent dose in Sv = WR (alpha radiation)*0.1 Gy + WR (gamma rays)*0.2 Gy.
Since WR (alpha radiation) equals 20 and WR (gamma rays) equal 1,
Equivalent dose in Sv = 20 x 0.1 + 1 x 0.2 = 2.2 Sv.