English: Graph of quality factor (QF) versus dose-averaged unrestricted linear energy transfer (LET) of ionizing radiation. The quality factor is meant to approximate the relative biological effectiveness in humans. QF's have since been replaced by radiation weighting factors that are independent of LET.
International Commission on Radiological Protection (1991). "1990 Recommendations". Annals of the ICRP21 (1-3). ICRP publication 60. Retrieved on 17 May 2012.
International Commission on Radiation Units and Measurements (1970) Linear Energy Transfer, Washinton D.C. Retrieved on 1 December 2012. ISBN: 978-0913394090. ICRU report 16
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