Section He-P 4021.20 - Additional Requirements(a) Each specific licensee shall, no less than 30 days before vacating or relinquishing possession or control of premises which may have been contaminated with radioactive material as a result of licensee's activities, notify the DHHS/RHS in writing of intent to vacate.(b) If in the course of a survey as required by He-P 4022.01, a licensee should find a surface contaminated to levels in excess of the values specified in Table 4021.2, Column 1, the licensee shall immediately institute measures to reduce the contamination to the levels specified.(c) No licensee shall allow surfaces or surfaces of objects contaminated to levels in excess of the values specified in Table 4021.2 to be released to unrestricted areas.(d) Where surface contamination by both alpha and beta-gamma emitting isotopes exists, the limits established for alpha and beta-gamma emitting isotopes shall apply independently.(e) The radioactivity on the interior surfaces of pipes, drain lines or ductwork shall be determined by making measurements at all traps and other appropriate access points to the interior of the pipes, drain lines or ductwork.(f) Surfaces of premises, equipment or scrap that may be contaminated and that are of such size, construction or location as to make the surface inaccessible for purposes of measurement, shall be presumed to be contaminated in excess of the levels.(g) The amount of removable radioactive material per 100 square centimeters (cm2) of surface area shall be determined by wiping that area, with dry filter or soft absorbent paper and with the application of moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency.(h) For objects of lesser than 100 cm2 surface area, the entire surface shall be wiped and the above levels reduced in direct proportion to the area of the object.(i) Measurements of fixed contaminant shall not be averaged over more than 1.0 square meter.(j) For objects of lesser than 1.0 square meter area, the average shall be derived from measurements made on each of the surfaces of the object.(k) Disintegrations per minute (dpm) shall be determined by correcting the counts per minute observed by an appropriate detector and count rate meter, for background, efficiency, and geometric factors associated with the instrumentation.(l) Fixed beta-gamma contamination levels shall be measured through not more than 7 milligrams per square centimeter of total absorber.N.H. Admin. Code § He-P 4021.20
#5903, eff 2-1-95; ss by #6827, eff 8-6-98; ss by #8481, eff 11-5-05
Amended byVolume XXXIV Number 24, Filed June 12, 2014, Proposed by #10604, Effective 5/23/2014, Expires 5/23/2024.