Current through Register Vol. 35, No. 6, March 26, 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 part. As a minimum the following requirements
shall be met.
A. Each licensee or
registrant shall monitor occupational exposure to radiation from licensed and
unlicensed radiation sources under the control of the licensee or registrant
and shall supply and require the use of individual monitoring devices by:
(1) adults likely to receive, in 1 year from
sources external to the body, a dose in excess of 10 percent of the limits in
Subsection A of 20.3.4.405 NMAC;
(2) minors likely to receive, in 1 year, from
radiation sources external to the body, a deep dose equivalent in excess of 0.1
rem (1 millisievert), a lens dose equivalent in excess of 0.15 rem (1.5
millisieverts), or a shallow dose equivalent to the skin or to the extremities
in excess of 0.5 rem (5 millisieverts);
(3) 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 millisievert) (note: all of the
occupational doses in Subsection A of 20.3.4.405 NMAC continue to be applicable
to the declared pregnant worker as long as the embryo/fetus dose limit is not
exceeded);
(4) individuals entering
a high or very high radiation area; and
(5) individuals working with medical
fluoroscopic equipment:
(a) an individual
monitoring device used for the dose to an embryo/fetus of a declared pregnant
woman, pursuant to Subsection A of 20.3.4.412 NMAC, shall be located under the
protective apron at the waist;
(b)
an individual monitoring device used for eye dose equivalent shall be located
at the neck, or an unshielded location closer to the eye, outside the
protective apron; and
(c) when only
one individual monitoring device is used to determine the effective dose
equivalent for external radiation pursuant to Paragraph (2) of Subsection C of
20.3.4.405 NMAC, it shall be located at the neck outside the protective apron;
when a second individual monitoring device is used, for the same purpose, it
shall be located under the protective apron at the waist; the second individual
monitoring device is required for a declared pregnant woman.
B. Each licensee or
registrant shall monitor (see 20.3.4.408 NMAC) the occupational intake of
radioactive material by and assess the committed effective dose equivalent to:
(1) adults likely to receive, in 1 year, an
intake in excess of 10 percent of the applicable ALI(s) in columns 1 and 2 of
table I of 20.3.4.461 NMAC;
(2)
minors likely to receive, in 1 year, a committed effective dose equivalent in
excess of 0.1 rem (1 millisievert); and
(3) declared pregnant women likely to
receive, during the entire pregnancy, a committed effective dose equivalent in
excess of 0.1 rem (1 millisievert).
C. Each licensee or registrant shall ensure
that individuals who are required to monitor occupational doses in accordance
with Subsection A of this section wear individual monitoring devices as
follows:
(1) an individual monitoring device
used for monitoring the dose to the whole body shall be worn at the unshielded
location of the whole body likely to receive the highest exposure; when a
protective apron is worn, the location of the individual monitoring device is
typically at the neck (collar); or
(2) an individual monitoring device used for
monitoring the dose to an embryo/fetus of a declared pregnant woman, pursuant
to Subsection A of 20.3.4.412 NMAC, shall be located at the waist under any
protective apron being worn by the woman; or
(3) an individual monitoring device used for
monitoring the eye dose equivalent, to demonstrate compliance with Subparagraph
(a) of Paragraph (2) of Subsection A of 20.3.4.405 NMAC, 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; or
(4) an individual monitoring device used for
monitoring the dose to the extremities, to demonstrate compliance with
Subparagraph (b) of Paragraph (2) of Subsection A of 20.3.4.405 NMAC, 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.