For some perspective, 125 millisieverts is about 1/8th of an abdominal CT scan.
http://hps.org/physicians/documents/Doses_from_Medical_X-Ray_Procedures.pdf
The perspective provided by this example is quite limited. A person choosing to have a CT scan does so by signing a document permitting exposure to radiation and then receives a measured external dose to a targeted region. This choice is an exchange the medical community and patient elect or decline on the understanding that the patient will experience an increased risk of cancer in exchange for the benefits of the CT scan and that total dose is elective and tracked. The people living in this area are not having ONE CT scan but are continuously exposed both internally and externally (continuous CT scans in addition to eating and drinking isotopes). They can’t get away from the radiation and it continues to this day - their total dose is unknown and is not performed in exchange for health benefits. Those exposed never agreed to this exposure, continued exposure, and total dose is a complete mystery. And should they be diagnosed in a few years with leukemia or cancer as a result of continuous internal and external exposure, no one will be held liable or responsible.