Based on BEIR I Cancer - 2% per 5 rem over 30 years 2%/5 = 0.4%/rem Based on ICRP Risk coefficient for total body = 100/10° /person rem 10 u x 500 people x 17 = 5500 person/rem Hl for 11 rem 10x = 5500 risk coefficient - bone marrow x = 5500 100 = 55 = 100 20/10° person rem 55