Congressional Budget Office Cost Estimate: H.R. 4675: Low-Dose Radiation Research Act of 2017 [open pdf - 91KB]
"H.R. 4675 would authorize the appropriation of funds for the Department of Energy's (DOE's) Office of Science to conduct basic research on low-dose radiation. CBO [Congressional Budget Office] estimates that implementing H.R. 4675 would cost $96 million over the 2018-2022 period, assuming appropriation of the authorized amounts."
Congressional Budget Office: http://www.cbo.gov/