# WS.RUC MALIN SCE DrIHOM OF MADHCROGICA,HM Finvag: 18. Monitoring’ for externa) gamma radigtion near:BheNevada + ° i/ Tey Bite by: U.S. Public Health Berviegpersonnel: °aSee: instruments (fig. 18), chamber survey instruments, fallouttrays. and additional air samplers and recorders, Each vehjcle.was equipped witn two-way voice radio communication? e° number of teams used for each event was determined Anade vance by the predicted radiological situation, howeverfive’to ten teams was the usual number deployed. Up to 20 teams could be organized within a short time, but were not normally: maintained on a standby basis. Mobile ground monitoring teams are still maintainedon, a atandby basis and used when needed. m iea Alr Sempling oes There were and are $0 permanent iir sampling stations in operation 24 hours per day in the areca surrounding the: NTS at distances up to 180 miles distance. “ae The air samplers used are high volume unite, drawing air through an 8" x 10” glass fiber filter (fir. 14). When deemed desirable, a secondary activate! charcoal cartridge is added for the collection of gaseous fission products. Flow rates are ap- proximately 60 cubie feet per minute fm.) for the glasa fiber filter alone and 25 ¢.f.m. with the chareoal cartridge added. 40) “remoe volume air kampler. The large glass fiber filter is for val . lection uf particulates. Behind the filter is placed an nctivated jarconl cartridue to collect yases such as radiviodines. aty =Glass fiber filters ure counted for gross beta activity in the p ii portionalregion. oe) ay All charcoal cartridges, and any glass fiber fiitere ws af? gross beta activity signilicantly above background levels aMes. we “*assayed with # 400 channel gammaacintilintion spectrometers uning a gteol shield for a 4° x 4" Nal (TYeryatal with a Cs * peak resglution of eight percent for identification of speci oa+ gamme-gnitting isotopes. : > file tedging : : : Film badges were distributed to hundreds of lucutionsar“ae the Test: Site and to ae many as 1,000 persone during ce rat: operations. Presently there are about 60 locations with som 200 persons wearing film badges. Film badges were and 4 collected: and procusaed munthly, In the evont that sn activity was found in the area by the mohile moniteriny Leama oe film badges were collected from these logationy and front, people ving in the area: new Alm badges were distributed. Additional atationa and people were dneladed if the viteetlan. required more extensive monitaring. it