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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This note was uploaded on 04/04/2011 for the course EMS 162 taught by Professor Howitt during the Spring '08 term at UC Davis.

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

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