Risks from ionising radiation: an HPA viewpoint paper for Safegrounds

Area of Science:

• Radiological Protection
• Environmental Science
• Nuclear Safety

Background:

• Safegrounds disseminates guidance on managing radioactively contaminated land in the UK.
• The International Commission on Radiological Protection (ICRP) provides a protection system based on extensive radiation risk data.
• Concerns exist that ICRP methodology may underestimate risks, especially for internal emitters.

Purpose of the Study:

• To review the basis for current radiation risk estimates.
• To summarize the ICRP protection system for stakeholders.
• To address viewpoints on potential underestimations of risk by ICRP.

Main Methods:

• Review of extensive scientific literature on radiation exposure risks.
• Analysis of epidemiological and experimental evidence.
• Comparison of national cleanup standards with natural background radiation doses.

Main Results:

• Evidence supports applying high-dose risk estimates to low-dose exposures.
• National standards for contaminated land are two orders of magnitude below natural background radiation.
• Risk estimates at very low doses are uncertain but likely overestimates.

Conclusions:

• The ICRP protection system is based on sound scientific data.
• Current cleanup standards for radioactively contaminated land are conservative.
• Estimated risks at very low doses are unlikely to be substantial underestimates.