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首页> 美国政府科技报告 >Uranium Mill Tailings Remedial Action Program. Radiological Survey of Shiprock Vicinity Property SH09, Shiprock, New Mexico, October-November 1982
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Uranium Mill Tailings Remedial Action Program. Radiological Survey of Shiprock Vicinity Property SH09, Shiprock, New Mexico, October-November 1982

机译：铀矿尾矿补救行动计划。 shiprock Vicinity property的放射学调查sH09，shiprock，New mexico，1982年10月至11月

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At the time of the survey, one residential structure was located on the property. The lands surrounding the structure were landscaped with lawn cover and trees. The assessment activities included determination of indoor and outdoor surface radiation levels, for both fixed and removable contamination, through direct instrument and smear (indoor only) surveys; measurement of ambient external penetrating radiation levels at 1-meter heights; and analyses of air and soil samples. No evidence of radioactive contamination was found in the residential structure; background levels of radioactivity were indicated throughout. Radiation exposure rates were less than the 20 mu R/h above background limit. Short-term radon daughter measurements did not exceed the 0.02 WL limit for average annual concentration including background as specified in the EPA Standard. The assessment indicated elevated levels of radioactivity at several areas in the outside environs. A general area was found along the west side of the residence, encompassing about 160 ft exp 2 , and a discrete hot spot of localized area was found near the back porch of the residence. General areas of elevated radioactivity also were found at the west edge of the property, paralleling the roadway and encompassing about 120 ft exp 2 , and at the alleyway, encompassing about 1300 ft exp 2 . Radiochemical analyses of the soil sample collected from the west edge of the property indicated a radium concentration of 24 +- 2 pCi/g, which is in excess of the limit of 5 pCi/g above background. Analyses of surface soil samples collected at the alleyway from nearby vicinity property sites also indicated radium concentrations in excess of the limits. Subsurface soil sampling was not conducted. Remedial action for this vicinity site should be considered. (ERA citation 09:042999)

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