Highlights
- • J-value has assessed population relocations after Chernobyl and Fukushima Daiichi.• Relocation was unjustified for 75% of the 335,000 people relocated after Chernobyl.• Relocation was unjustified for the 160,000 people relocated after Fukushima.• Loss of life expectancy is a simple but accurate way of conveying radiation risk.• The J-value builds on loss of life expectancy to provide objective guidance.