Radiation Protection and Environment

LETTER TO THE EDITOR
Year
: 2020  |  Volume : 43  |  Issue : 2  |  Page : 115-

Update on guest editorial, “Radiological safety and radiation emergency preparedness” (Radiat Prot Environ 2020;43:1-5)


DD Rao 
 Editor, Radiation Protection and Environment, Mumbai, Maharashtra, India

Correspondence Address:
D D Rao
Editor, Radiation Protection and Environment, Mumbai, Maharashtra
India




How to cite this article:
Rao D D. Update on guest editorial, “Radiological safety and radiation emergency preparedness” (Radiat Prot Environ 2020;43:1-5).Radiat Prot Environ 2020;43:115-115


How to cite this URL:
Rao D D. Update on guest editorial, “Radiological safety and radiation emergency preparedness” (Radiat Prot Environ 2020;43:1-5). Radiat Prot Environ [serial online] 2020 [cited 2020 Oct 21 ];43:115-115
Available from: https://www.rpe.org.in/text.asp?2020/43/2/115/293626


Full Text



 Eye Lens Threshold Dose



The threshold dose for opacity of the eye lens has been mentioned as 2–10 Gy. However, based on the new epidemiological findings, the ICRP had recommended a new threshold dose for the induction of opacity/cataract in the lens of eye during 2011. As per the ICRP statement on tissue reactions, there are some tissue reaction effects, particularly those with very late manifestations, where the threshold doses are or might be lower than previously considered. For the lens of the eye, the threshold in absorbed dose is now considered as 0.5 Gy. This is the revision of the threshold dose of >2 Gy adopted previously for cataract induction.

 Exposure to Member of Public



The effective dose to a member of public in the vicinity of NPP site due to radioactivity discharged from nuclear site during its normal operations was given as nearly 25–50 μSv/y. This has been so in the early years of older power plants' operation. In the past decade or so, the lower bound of the dose is much lower and has been continuously decreasing. It was found that the lower bound doses are about 1 μSv/y and even lower for newer plants such as Kakrapara (around 0.5 μSv/y) and Kudankulam (0.05 μSv/y).