Current through Register Vol. 47, No. 6, September 18, 2024
Each licensee or registrant shall monitor exposures from
sources of radiation at levels sufficient to demonstrate compliance with the
occupational dose limits of this chapter. As a minimum:
(1) Each licensee or registrant shall monitor
occupational exposure to radiation and shall supply and require the use of
individual monitoring devices by:
a. Adults
likely to receive, in 1 year from sources external to the body, a dose in
excess of 10 percent of the limits in 40.15(1);
b. Minors likely to receive, in 1 year from
sources external to the body, a deep dose equivalent in excess of 0.1 rem (1
mSv), a lens dose equivalent in excess of 0.15 rem (1.5 mSv), or a shallow dose
equivalent to the skin or to the extremities in excess of 0.5 rem (5
mSv);
c. Individuals entering a
high or very high radiation area;
d. Individuals working with medical
fluoroscopic equipment; and
e.
Declared pregnant women likely to receive during the entire pregnancy, from
radiation sources external to the body, a deep dose equivalent in excess of 0.1
rem (1 mSv).
(2) Each
licensee or registrant shall monitor, to determine compliance with
641-40.18 (136C), the
occupational intake of radioactive material by and assess the committed
effective dose equivalent to:
a. Adults
likely to receive, in 1 year, an intake in excess of 10 percent of the
applicable ALI in Table I, Columns 1 and 2, of Appendix B;
b. Minors likely to receive, in 1 year, a
committed effective dose equivalent in excess of 0.1 rem (1 mSv); and
c. Declared pregnant women likely to receive,
during the entire pregnancy, a committed effective dose equivalent in excess of
0.1 rem (1 mSv).
(3)
Location of individual monitoring devices. Each licensee or registrant shall
ensure that individuals who are required to monitor occupational doses in
accordance with 641-40.37 (136C) wear individual monitoring devices in
accordance with the dosimetry vendor specifications and processed in accordance
with NVLAP-approved calculation methods. Additional requirements are as
follows:
a. An individual monitoring device
used for monitoring the dose to an embryo/fetus of a declared pregnant woman
shall be located at the waist under any protective apron being worn by the
woman;
b. An individual monitoring
device used for monitoring the eye dose equivalent, to demonstrate compliance
with 641-40.15 (136C) shall be
located at the neck (collar), outside any protective apron being worn by the
monitored individual, or at an unshielded location closer to the eye;
c. An individual monitoring device used for
monitoring the dose to the extremities, to demonstrate compliance with
641-40.15 (136C), shall be worn
on the extremity likely to receive the highest exposure. Each individual
monitoring device shall be oriented to measure the highest dose to the
extremity being monitored.
