BEIR VII concluded that the available biological and biophysical low dose data support a linear-no-threshold (LNT) risk model. According to this model, even the smallest dose of radiation has the potential to cause a small increase in health risk to humans. The reports from UNSCEAR and the ICRP concluded that the LNT hypothesis remains a prudent basis for radiation protection at low doses and low dose rates, but may not reflect biological differences and risks in the low dose region (Morgan & Bair, 2013)