University of California and other educational institutions published the report to prove low level of exposure causes leukemia. The details are like below.   Title Radiation and the Risk of Chronic Lymphocytic and Other Leukemias among Chornobyl Cleanup Workers URL http://ehp.niehs.nih.gov/2012/11/1204996/ Researchers Lydia B. Zablotska,1 Dimitry Bazyka,2 Jay H. Lubin,3 Nataliya Gudzenko,2 Mark P. Little,3 [...]