(a) Finding and declaration of fact. The following occupations
involving exposure to radioactive substances and to ionizing radiations
are particularly hazardous and detrimental to health for minors between
16 and 18 years of age:
(1) Any work in any workroom in which (i) radium is stored or used
in the manufacture of self-luminous compound, (ii) self-luminous
compound is made, processed, or packaged, (iii) self-luminous compound
is stored, used, or worked upon, (iv) incandescent mantles are made from
fabric and solutions containing thorium salts, or are processed or
packaged, (v) other radioactive substances are present in the air in
average concentrations exceeding 10 percent of the maximum permissible
concentrations in the air recommended for occupational exposure by the
National Committee on Radiation Protection, as set forth in the 40-hour
week column of table one of the National Bureau of Standards Handbook
No. 69 entitled ``Maximum Permissible Body Burdens and Maximum
Permissible Concentrations of Radionuclides in Air and in Water for
Occupational Exposure,'' issued June 5, 1959.
(2) Any other work which involves exposure to ionizing radiations in
excess of 0.5 rem per year.
(b) Definitions. As used in this section:
(1) The term self-luminous compound shall mean any mixture of
phosphorescent material and radium, mesothorium, or other radioactive
element;
(2) The term workroom shall include the entire area bounded by walls
of solid material and extending from floor to ceiling;
(3) The term ionizing radiations shall mean alpha and beta
particles, electrons, protons, neutrons, gamma and X-ray and all other
radiations which
produce ionizations directly or indirectly, but does not include
electromagnetic radiations other than gamma and X-ray.
[22 FR 3657, May 24, 1957, as amended at 26 FR 8885, Sept. 21, 1961.
Redesignated at 28 FR 1634, Feb. 21, 1963, and amended at 28 FR 3449,
Apr. 9, 1963. Redesignated and amended at 36 FR 25156, Dec. 29, 1971]
