Super» UNCLASGIE ee | Lov, 3. ‘The capture —— so low that all counts were Theaccuracy of A count is given by the formas | 7 ot i aear ret oa 9 @ Vinge REE Ny-tg ay ef tee ” ghere Pe= = poms errcr, No = ecunts due tc back ground of thecour: = eccunts due tc the sample, 1EP Papi a In making these nessurenent. Nyeh2 = 200. The back grcund cf the ccunters were anvrcxinately 20. the pills’echtainine little cr no induced activity, were ecunted until n this basis a samnle ecntaining 10 counts/min. abcve back rreund was cunteste an necuracy of abcut 15% cnly (4.¢e. Pe & 15%). In this re- port it ts assumed that a vill heving 2 ecunt cf 1C ecunts/min. above background hes nc significance, This places the iower linit cf neue tron detection at 3 x 10? neutrons/en@, The vills having 50 ecunts/nir cr mere were countec with scme what greater accuracy, 4 The descripticns c? ilccasions cn benaré ships were frequently 5. Very cften the pills riaced cn exposed nositicns cn beard the inadequate cr nct legible. Tse: shins were blown eway by the blast, ‘cst results renresent the neutror acesage in rositicns having unknown ancunts of shielding fror the cireet neutrcn burst. F, SR eran Zo maior SoMaerelamaamat ber:2 emesis + ter and Ky i, ‘Experimental Data All pills were counted that were reecvere’ frer ships Lceated within 800 yarcs «cf the estimated pcint cf cetonation, Only teken pills were ecnnted from ships located frem 800 tc 1200 yards fren the detcnaticn, All results of slow neutron measurements are given in Teble I, No attempt his been race te analyze the cata cther than to iccate the maximur reading chtained abcard each ship on an cverinyof the target array (Fig.3%), Decry curves, shcwn in Fig. 1, gybstantinte the fact that the activity boing mensurad was fue tc P3e 3 . § ' ’ 2. The relrticnshin cf total sloneutrons tc distance is shcwn in Table II, This table was ccmnilec by taking the highest: reading obtained cn each ship as revresenting the neutren intensity at that point with no regard fcr shiclding. “The distance fren that’“woint te. the estinated reint cf detonation was mrensvred cff fren the map of thc tarect array These results show the fcllewin? neutrcn 11°BSo° yarns. i "x 1022 ls x 104% neutrens / en 2, at.600 yards 1 x 10*+, and at 1000 yards abeut 3 x 107, et 800 yards, 3.. fhe data in Table I ray give ecnsiderable infornation on : . shielding effects when ecnsicere’d in ecnnecticn with elans cf the vare -deus shins, No atterrt is made here tc evaluate the date with respect tec shielding beenuse plans cf the shins were nct available. It is apparent however that there are rather rypoat differences fn reasuree ments taken in various places cn the ships, This is undcubtecly cue .Jarecly to differences in distances frem the rcint cf detcneticr nnd Ls Re in part fo shieldine, The variance in results cn the Slate may be due .,. in Laree reassure tc the fact |that water is a aged phielding 5eterial | “) -agednst nentrons. ‘The cornte/nin, obtained from the sulphur nails ‘on the target ghtps2mre given in Tabie IM, The calculation cf the neutren intene . 4 a : 5 gities rill $eve tc wait until the capture ercssesecticn fcr sulphur co asobtained,” However acnsicerrble fast neutren intensity TAS + indicate _ & + rs on the Skate abcut 300 yards frem the burst, aygenonctrated ‘ssTar ag the Tndependense,: Py S