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EMS162_2011_Lecture9

EMS162_2011_Lecture9 - Radiation Biology X-rays are a form...

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1 1/27/2011 EMS 162 - Winter 2011 25 Yayoi Takamura Radiation Biology X-rays are a form of ionizing radiation: – Cause the ejection of an orbital electron from an atom forming a pair of ions with opposite charges and/or breaking bonds between atoms. – For cells the effects include: Cells are undamaged by the dose Cells are damaged, repair the damage and operate normally Cells are damaged, repair the damage and operate abnormally may lead to tumors/cancer, genetic mutations. Cells die as a result of the damage erythema (reddening of skin), sterilization, amputation. 1/27/2011 EMS 162 - Winter 2011 26 Yayoi Takamura Units of Radiation Measurement Units and nomenclature developed by International Commission on Radiological Units (ICRU) Exposure in air: (Unit: Roentgen, R ) Ionization per unit mass of air due to x-ray or gamma radiation R = 2.58 x 10 -4 coulomb/kg air Easy to measure directly Absorbed dose: (Unit: Rad or Gray =100 rad ) Energy deposited in a unit mass by radiation
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