Radiation Hormesis

1. Risk associated with ionizing radiation

2. The risk assumptions are based on the Beir V report.

1. Assessed the effects of low levels of ionizing radiation.

2. Extrapolated from doses above .5 Sieverts

3. Equivalent to approximately 160 years of background exposure.

4. Beir V report utilized linear non-threshold patient/dose relationship.

3. Japanese A-bomb survivors were counterintuitive to the report in that, low level radiation exposure produced a lower rate of cancer.

4. Animal experiments indicate doses below .25 Sieverts being beneficial.