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          About NRC  Radiation Protection  How the NRC Protects You  Health Physics Positions Based on 10 CFR Part 20Health 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). 
      
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