MEDRADSC 3U03 Lecture Notes - Lecture 15: Fetus, Hibakusha, Equivalent Dose
4 Jan 2017
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Document Summary
Annual background dose to body 1msv. X-ray machines, ct units and accelerators generate x-rays and electron beams. Higher radiation protection in the centre of the earth. Each radiation room has: radiation warning sign at the entrance, beam-interlocked entrance, beam status lights at several. Iodine for thyroid radioactive liquid, look for bone turn-overs. Topic 2 radiation ndose, units and levels: 1 gy of photon 1 gy of proton. Absorbed dose (gy: not every gy is equal. Equivalent dose (sv: absorbed dose corrected for biological effectiveness, 1 gy of protons = twice as damaging as 1 gy of x-rays, 1 sv of protons = equaling as damaging as 1 sv of x-rays. Each of these definitions quantifies the extent to which radiation deposits energy in matter through ionization. Biological effects arise principally from damage to dna molecules. Icrp 90: 40% of mental retardation at 1 gy. Chances of development of cancer later in life.
