United States Nuclear Regulatory Commission - Protecting People and the Environment

Health Physics Questions and Answers - Question 100

Question 100:

(a) Is any special TLD monitoring of eye dose equivalent required?

(b) Do TLDs for eye dose measurement need to be physically located near the eye?


(a) Individual monitoring of the dose equivalent to the lens of the eye is required if the eye dose is likely to exceed, in a year, 1.5 rem (10% of 15 rem) for an adult or 0.15 rem (10% of 1.5 rem) for a minor. Licensees may use any form of monitoring that is capable of measuring these doses.

(b) The answer to this question depends on the conditions of exposure. In most cases a licensee will not have to physically place a TLD near the eye. However, there may be unusual exposure situations (such as exposure of the eye to a narrow beam of radiation) that would make it necessary to place a dosimeter near the eye. [Note: See Questions 45 and 46.]

(References: 10 CFR 20.1003, 10 CFR 20.1201, 10 CFR 20.1502).

Page Last Reviewed/Updated Tuesday, October 06, 2015