The NRC says there are no data to reliably estimate the occurrence of cancer following exposure to low doses and dose rates below about 100, 000 microsieverts.
The findings indicated the relationship between birth weight and pollution was dose related - the higher the exposure, the lower the average birth weight.
This report will further examine this susceptibility by analyzing temporal trends in childhood cancer in populations exposed to low-dose nuclear power plant emissions 5-10 years after initial exposure.
Calabrese says that many poisons follow, instead, a U-shaped curve: The death rate goes down as the dose climbs from zero to a certain small amount, what you could call the optimal exposure.