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Friday, January 20, 2017

LNT approach is not justified for radiation protection


LNT controversy is appearing again and again in the scientific forums worldwide. In every forum it is said that there is no concrete evidence and justification to accept LNT approach for radiation protection purposes. Finally, it is said that in-spite of all the controversies, LNT is accepted in the radiation protection system since it is easier to manage the radiation doses, and for decision taking regarding w.r.t a practice or procedure.

Why this is forced acceptance? And what cost? Billions of dollars?

As a well-informed radiation protection professional, I am strongly of the opinion that:
1.     ICRP has recommended one-year dose limit of 50 mSv for occupational workers in the System of Dose Limitation. It is assumed that there are no clinically observable biological effects up to a dose of 100 mSv.

Accept 50 mSv as the threshold dose for stochastic effect.

2.     As a measure of good work practice, optimise the occupational exposures in a dose band of 10 to 50 mSv/y. Optimization to be carried out only up to a risk level keeping in view of the overall risk in perspective. 

[10 mSv is the annual dose accepted in radon at work places.] 

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