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Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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?

Answer:

(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 31, 2017

Page Last Reviewed/Updated Tuesday, October 31, 2017