This report considers the evidence relating to cancer risk
associated with exposure to low doses of low-LET radiation, and
particularly doses below current recommended limits for protection
of radiation workers and the general public. It looks at the
possibility of establishing a universal threshold dose below which
there is no risk of radiation-related cancer. The focus is on
evidence regarding linearity of dose response for all cancers
considered as a group, but not necessarily individually, at low
doses (the so-called linear, no-threshold (LNT) hypothesis). The
report concludes that while existence of a low-dose threshold does
not seem unlikely for radiation-related cancers, it does not favor
the existence of a universal threshold. The LNT hypothesis,
combined with an uncertain dose and dose rate effectiveness factor
(DDREF) for extrapolation from high doses, remains a prudent basis
for radiation protection at low doses and low dose rates.
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