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CH3041
IONISING RADIATION
• Ionising
radiation includes a, b and g.
• a
particles have a short range (lungs 60 mm) - internally they do damage (eg.
222Rn).
• b
particles & g
rays are longer range & will pass thru skin (eg. 90Sr) Þ more dangerous.
• Curie (Ci) is the number of
decay events /s
in 1g of 226Ra (SI: Becquerel; 1Ci = 3 x 107 Bq)
in 1g of 226Ra (SI: Becquerel; 1Ci = 3 x 107 Bq)
• Radiation Adsorbed Dose (rad): radiation required so that tissue adsorbs 1x10-2J / kg.
• mrem = 1
mrad x RBE
- a common
unit where RBE is a correction factor for the biological effectiveness of the radiation.
unit where RBE is a correction factor for the biological effectiveness of the radiation.
