he -{ Sof-7- eI L A-670 File Those Eligible To Read the ‘é: . Date T=26=L4y Attached Subject_ NCTES ON MERTING OF WEDNESDAY, JULY 26, Copy 6 Weinberg ] 1944 CEx ..ok RESEARCH Liphalx : JCUMENT COLLECTION By Ohlinger : DOCU Instructions Of To !{’?' / . o il lLb _;LE_‘ ........ --“.)..:.;é Before reading this document, sign and date below }f/‘y;’ /f),]/ Name Date Neme Date A e CENTRAL RESEARCH LIBRARY DOCUMENT COLLECTION LIBRARY LOAN COPY DO NOT TRANSFER TO ANOTHER PERSON If you wish someone else to see this document, send in name with document and the library will arrange a loan. Those: 'pres'ent:t Allison, Szilard, Wigner, Mo;'rism_x,‘ Fz;an_ck, - Creutz Vernon, Young, Ohlinger Besides the use of the chain reaction for the production of he production of isotopes, a ‘third very important use mentioned ther outline presented at one of the early discussions was a ‘small:’ ar-the production. of radiation with =& very high level of intensit the speaker at this meeting, explained a pile of Y type,. t , & radiation source for experimental purposes in ' & % military use of the product. There is no plle now: operat— ux as high as Hanford which can-be used for experimental purposess. - While' such-a unit might seem expensive at first (the cost would be: about $150,000- to. $200,000); itiwould give an important too: 5 or study: at- & cost not too much more: than & cyclotron-and with & much ~ better source. The flux in the pile proposed by ¥re Morrison would be: “ about ‘five times tha ; the W pile. . 5.0 & e R e principle of the pile proposed by Mra Morrison is _reaction in U9, using a homogeneous mixture of L9 and a. moderator with . “cemtral core,. Water as & mgderator would not be: very useful because:of * fts rapid decomposition under the intense radiation to be obtained. ‘Therefore, it ‘igsuggested ‘that beryllium or beryllium oxide: or some - gimilar material be used as- a-moderator—with-the L9 probably in the: of “the: oxide, - Cooling would be.obtained by radiation from the surface of the pile proper with the heat. removed by cooling coils in the: reflee . -around the pile. With beryllium oxide as the moderator and 2 ~ 3 kg of “}9 in the form of the oxide as- the active metal, the temperature drop i : le: would.be about 1000% C. . Pt ‘Thegeneral ‘arrangement of such a pilé would be as indicated tically in'the sketch ’a‘bfaéqhfifir. ; AR .- ' The-core of the pile:would be'a beryllium metal (or perhaps BeO "or graphite) bottle into which could be poured pellets of beryllium-and plutonium oxide as needed.: Surrounding this to form the pile proper . would be a cube 80'cm on a sidé composed of closely fitted beryllium oxide blocksiwith small depressions af regular intervals into which = . - would be placed: small.compressed bricks of the plutonium oxide. (pure- ' beryllium blocks, and-pure L9 could be.used in place of the oxide), " ‘Surrounding the. cubical pile would be a 2" thick graphite crucible - “ contained within a shell of bismuth-lead eutectic covering all sides of the pile’dnd crucible exoept the top. Embedded in this bismuth-lead. i 2 onage A_c‘:. YiS: ey ‘doed] prnox gyuow tod *emwS OT- 400z fButgeaado T er;d ayq Souo:. : . puE.pasn-eq PINOA’ 61 .30 £ep xed *m3 1 gnoge- jep aed gquefiam U m':, -qo oL ’and aY3. Jo 8pTs 8UQ U0 UTRIIND JI9JEM AYL qu ToJjued 99BWTIIR " oy3 UITM POITESD S UMOp PaMOTS 2o dn pepseds:eq usyy PTHCD porasd syl mx-reqw 430q 20 Jeyjye Jo syorred deujany Jo UOT4IPPE-suy LF *pejnuTm v “omg Les po*;.red s3xer ® yjmm Burqesedo 5T o1Td- oy3 pue pessed 8T o azxs TEOTYTL0 84 TT4UM 8T330q J83usd eyj 03uT peddoip sze (Louessts ‘=100 PeITsep Lue 0 L. aqz 99NTTP 03 POPPE.BIB: saemd mnt&mq su3). appco um-;uoqn'[d pue um > ; “esey; syonpoid. uotse’;; enosse? ‘omos 4T qgm‘ eau?u pUE IMTTAY 8y Wouy oTFd FeUUT ‘euy 30240ad. 0y SPEW HQ PTNOM admezax . Ou “uBTESp STY3 UT - *WOO SUTPUNOIINS BUY. .om TTRYS BU3 WOIF ‘SALBT. - uc;gé;imm a0y sq10d TTRWS shoTpumu PUBXS DPTNOM 3{00Tq 936&0 59T :JO- BEpTS qfino.n{], “*er1d eyj.og e80T susur;aads Eums';p -peginTd -peppeqme 8q pIhoM: .Tuu Ut ; reproduction factor would be around 5 times that of s machine.. The total leakage flux would be around 1012 or-1013 measured: as surface flux at the face of the thermal column, At the -thimble, the flux would be about five times this-value. - Mr. Morrisom .felt that the- d:asign-wae eminently stable and that no nnclear catastrophe ; mmring parts. : M. w:\.gnervfear:sd‘[that the beryll;i.um might reduce 4he oxide’ leav- ‘ing pure L9 which melts at 625% and therefore it would be preferable to either use oxides for both the moderator and the active metal or else . the. pure metals‘ The latter gives: