1. Ionizing radiation exposure of the population of the United States,2009
2. Health risks from exposure to low levels of ionizing radiation BEIR VII phase,2006
3. The 2007 recommendation of the international commission on radiological protection;Ann ICRP,2007
4. International Commission on Radiological Protection. Biological effects after prenatal irradiation (embryo and fetus). Publication 90, Ann. ICRP 2003;33(1–2).
5. Limitation of exposure to ionizing radiation,1993