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mSv/a) 90: μSv/h: Natural radiation on a monazite beach near Guarapari, Brazil. [67] (9: Sv/a) 1: mSv/h: NRC definition of a high radiation area in a nuclear power plant, warranting a chain-link fence [68] (17–173: Sv/a) 2–20: mSv/h: Typical dose rate for activated reactor wall in possible future fusion reactors after 100 years. [69]
Recognized effects of higher acute radiation doses are described in more detail in the article on radiation poisoning.Although the International System of Units (SI) defines the sievert (Sv) as the unit of radiation dose equivalent, chronic radiation levels and standards are still often given in units of millirems (mrem), where 1 mrem equals 1/1,000 of a rem and 1 rem equals 0.01 Sv.
In medicine, the total amount of a drug or radiation given to a patient over time; for example, the total dose of radiation given in a series of radiation treatments or imaging exams. Recent studies have drawn attention to high cumulative doses (>100 mSv) to millions of patients undergoing recurrent CT scans during a 1- to 5-year period.
Megavoltage X-rays are produced by linear accelerators ("linacs") operating at voltages in excess of 1000 kV (1 MV) range, and therefore have an energy in the MeV range. The voltage in this case refers to the voltage used to accelerate electrons in the linear accelerator and indicates the maximum possible energy of the photons which are subsequently produced. [1]
The adoption of the gray by the 15th General Conference on Weights and Measures as the unit of measure of the absorption of ionizing radiation, specific energy absorption, and of kerma in 1975 [17] was the culmination of over half a century of work, both in the understanding of the nature of ionizing radiation and in the creation of coherent ...
Treatment simulations are used to plan the geometric, radiological, and dosimetric aspects of the therapy using radiation transport simulations and optimization. For intensity modulated radiation therapy ( IMRT ), this process involves selecting the appropriate beam type (which may include photons, electrons and protons), energy (e.g. 6, 18 ...