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).