Corp. Scurce Cede: 6602000 Publication Date: Oct 1973 747 p. Primary Report Now: NVO--140(Voel.1) Journal Anoneuncement: NSA3O Availability: Nevada Operaticans Office. Document Type: Repart Language: English Subfile: NSA (Nuclear Science Abstracts) Work Location: United States Descriptors: *#CESIUM 137--*RADIATION MONITORING; *COBRALT 460--*RADIATION MONITORING; *ENIWETOK--*#RADIATION MONITORING; *FALLOUT DEPOSITS--*VARIATION s *HUMAN POPULATIONS--#RADIATION DOSES; *FLUTONIUM 239--*RADIATION MONITORING: *STRONTIUM 90--*RADIATION MONITORING; AERIAL MONITORING; ANIM ALS; BODY; ENVIRONMENT; EXTERNAL IRRADIATION; FOOD CHAINS; GAMMA SOURCES; H EALTH HAZARDS: INGESTION; INHALATION; INTERNAL IRRADIATION; ISLANDS; PLANTS . 3 RADIOACTIVITY; RADIONUCLIDE KINETICS; RADIONUCLIDE MIGRATION; SAMPLING; S KELETON: SOILS; TERRESTRIAL ECOSYSTEMS; TIME DEPENDENCE Subject Codes (NSA): N445008# Environmental & Earth Sciences--Site Surveys; N44340 Environmental % Earth Sciences--Radicactivity Monitoring & Transport--Ecosystems & Food Cycles Record - 15 B48468 NSA-29-013005 Exposure rate reduction om Bikini Island due to concrete dwellings McCraw, T.F.3 Lynch, Q.D.T. Jr. USAEC Nevada Operations Office, Las Vegas. Radiclegical Bperatians Div. Corp. Source Cede: 9500450 Publication Date: Jun 1973 8 p. Primary Repert No.: WAGH--1273 Journal Announcement: NSA29 Availability: NTIS $4.00, Decument Type: Repart Languages English Subfile: NSA (Nuclear Science Abstracts) Work Lacation: United States During the May 1972 AEC sponsored resurvey ef Hikini Atcll Measurements were made ta determine the reduction cf gamma exposure rates at dwelling sites due to the shielding effect of the concrete structures being erected for occupancy by the returning Bikini people. Exposure rates were measured at several points around and within each dwelling. Results shawed that exposure rates present from radioactivity remaining post nuclear testing are reduced within the concrete dwellings by a significant amount. Upon completion of the housing construction effont, an exposure reduction factor of about 50% may apply. This is about what was expected provided materials cf construction contained low levels of radioactivity. Even greater reduction can be expected when the housing area is cavered with one to two inches of coral gravel as has been recommended. Depending on the accupancy time for residents cof these houses, total exposure ta external radiation can be expected to be reduced accordingly. External exposure rates measured ranged from 7 ta SS mu R/hr, with an arithmetic mean value af 20 mu R/hr. (CH) Descriptors: *#BIKINI--*#RADIATION DOSES; #BUILDING MATERIALS-—*RADIATION PROTECTION; *HUMAN POFULATIONS--*RADIATION DOSES; BUILDINGS; CONCRETES; D OSE RATES; EARTH CRUST; ENVIRONMENT; EXTERNAL IRRADIATION; FALLOUT