Physicians for Social Responsibility are hardly experts in this matter. They are a die-hard liberal activist group.
Best group to go to used to be the Health Physics Society, but I’m not sure of their reliability lately (have been out of the field for some time).
We are flying blind. THAT IS NOT GOOD.
looking up my old data for releases into the air and water, the maximum concentration allowable by the NRC for release to an unrestricted area of soluable I-131 in water was 0.0000003 microciries/ml (300 pCi/l).