A criticism of three arguments on recurrent imaging and risk.

Managing radiation protection (RP) in relation to recurrent imaging continues to be debated. Recent arguments have focussed on high cumulative effective dose (CED), especially where it exceeds 100 mSv. This article argues that CED should not be the primary focus for tracking concerns on recurrent imaging. Arguments which advocate for increased RP measures after 100 mSv is exceeded are criticised as being in conflict with the linear no threshold model. Finally, a view of dose history as adding to background risk is discussed.