(a) No licensee may possess, receive, use, or transfer
licensed radioactive material in such a manner as to cause contamination
of soil or vegetation in unrestricted areas that causes a member of
the public to receive a total effective dose equivalent in excess
of 25 millirem (mrem)/year from all pathways (excluding radium and
its decay products) and to the extent that the contamination exceeds
the background level by more than:
(1) for radium-226 or radium-228 in soil, the following
limits, based on dry weight, averaged over any 100 square meters of
area:
(A) 5 picocuries/gram (pCi/g), averaged over the first
15 centimeters of soil below the surface;
(B) 15 pCi/g, averaged over each 15-centimeter thick
layer of soil below the first 15 centimeters below the surface; and
(2) for radium-226 or radium-228 in vegetation, 5 pCi/g,
based on dry weight.
(b) Regardless of the limits set forth in subsection
(a) of this section, each licensee shall make every reasonable effort
to maintain any contamination of soil or vegetation as low as is reasonably
achievable.
(c) Licensees shall, to the extent practical, conduct
operations to minimize the introduction of residual radioactivity
into the site, including the subsurface in accordance with the existing
radiation protection requirements in §336.304 of this title (relating
to Radiation Protection Programs) and radiological criteria for license
termination in Subchapter G of this chapter (relating to Decommissioning
Standards). If contamination caused by the licensee is detected in
an unrestricted area, the licensee shall decontaminate any unrestricted
area which is contaminated above the limits specified in subsection
(a) of this section.
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Source Note: The provisions of this §336.356 adopted to be effective June 5, 1997, 22 TexReg 4588; amended to be effective September 3, 1998, 23 TexReg 8837; amended to be effective November 8, 2018, 43 TexReg 7357 |