| 2. Conclusions a, The AC/PDR-27 type instrument for low renge (0-500 ar/hr) is a reliable and rugged instrument as vroved by ites oxecllent pcrformancc throughout CASTLE, b, Tho AY/2DR-18 trpe instrument for high reng2 (0 to 500 R/ar) was as denendabl- and accurato as any nr-vieus type of high range instruncnt, an’? is morn easily maintainod. Cc. Battcri-s continucd to be the cause of sost raciac instrument breakdowns duc to covcr age when drawn from surmly, a. Mo reliable alpha counters were available othr than those avail- adle for us: by tac laboratorics of TG 7,1. 6, Att-rpts to atock battcri-s, svar? tarts, “te. for morn than a fow roliabl-, standard tyn-s of inatrunents cror-d futile, duc to mace ane. limit-d faciliti-:s for r-vair,. ff. Exernt for -xn-rimintal us>, only acecptcd, standard trn-es of ine strua-nts should 6° cmmloy+d in futur+ oncrations. @. No spo-cial water monitoring devic-s arn nccossary, cxecpt for purcly scisntific purposes, in an ovcration of the CASTLZ t:me,. 3. Zrcommcndations a, That for future oterations, and -xeont for coxperin natal usc, only th: AN/D2-27 and AY/P"R~18 typ- instrve-nts ant standard n-wer types bo uscd zcncrally. >. That r:liabdls alpha ceountsrs, if devclopcd, bc availablo in linitcd nustcrs in caso unexncected alpha producing fallout is 2ncountercd, c, That great caro be taken through supply channcls to tnsurco that only reasonably fr-sh batterizs aro shinvad and stocicad for usc in tho forvard arca in futuro operations. lve T- 2 n oe >: