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quality factor

noun
  1. a property of ionizing radiations that affects their ability to cause biological effects. For weakly ionizing radiations such as gamma rays it has value 1 whilst for alpha rays it is about 20Former name: relative biological effectiveness
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012