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Machine-read from the scan, so expect some errors. Lines that couldn’t be read are left out.
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The follm%ngis intended to Ust some of the places visited a d ateatinl;a subject r e l a t e d to the trip I will 5e glad to engage in discrl-ssion *:?ith such If a ~ o n eis intsrosted in detailed inforrrration on g! psr t icl & r BEST COPY AVAILABLE had discussions with a number of persona ecgaged i n the solution o f problem sbller to those a t 1. 1 gave a two hour discussion ta B large group fron the Health 2, Z dfscussed problemrr of organization with the ihdical Director, 3. I inspected the instrunenti facilities and new instnunent develop Fleats with Dr. Ketts, I was esp xi all p Interested ina new fast neutron fission cheiu-ber that me con u8e st Uek R i d g e Xetionsl Laboratorg after adding e few improvements. 4.I inspected the Occupational Medicine and Industrial mgiene w a s t e disposal studies of Drs. Newell, Christenson, Eltingar, and Robock because their program tie e in very nicely with a eirnlhr program under R. J. 1AOrtOr1i n our Health Physics Laboratorp. I was especially interested in the liquid 5. A !lr. bop old (an air filter expert) and f visited the CZt-10 Aree t o inspect a circulating U@d (water) column pilot plant *sed to study the efficiency of this method of remving r e d i a - aatfve partidea from the air. Eff ici ena ies greater than 9% u r n obteined with mther low pressure drop. The soltd matter settles out in the bottom of the mater tankc making maintemnce a simple problem. The @ is automiticaw adjusted and the efficiency of the s;rstem can be inareaced by the use of steamo The operating coat iS very low; they &lm 8 high efffciorzy for particles of ell sizes (elq>eriments have not been completed to prove this p i n t ) and presumably it would work for air frc.rn chemistry operations a s -1- pile cooling air, Human Studies Project
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6. 1 inspected most of the health phy~slcsf aci li ties with Dr. Buteo They have about 70 persona engaged i n health physics operatione and are e t present in tho proms8 of expandhg their research and developmaart -grama and extending the health physics m e y coverage. They plan to develop t h e i r beta-gamma film monitoring along a plan similar t o that uaed a t Oek Ridge National Iaboratory and to uae the Oak Ridge Nationel IeboratorJr mtkd of neutron manitorlng as soon as it can be set up. DP. Khite (sho has been a t Las Alamoa about one year) is doing a fine job in the improvement of the Health F%yslaa Progmrn, They have mew radiation proUenm of a s d o u s natum and ha (aoccrciing to some members 02 the have had rho ie oystemeticallp coneidsring these problems one bp one, and fh ding a solution for them, of conditima that would create a sdaus partidle problem there ktt BO far they have not made any p9t.ticle xiimsuroments. I 8 ~ s ra greet deel of evfdenue 7. I visited the fast reactor, water boiler, and several operatiom December 5 at San Franciscq physiciata and radiologists from all mer the United States t o 8~3111brthrw I attended a meeting aalled by DF. E. P. Pendergmass of about thirty Pihat are the acute effects fkom 50 r w h o l e body external radiation 3. A t the rate of 20 r per hour A t the mte of 10 r per hour Bow soon niU the effects manifest thmmelves rad when nill the indlvidusl lose his efficiemcp t o the extent theit he w i l l hoe to be replead? T& fol ld ng faators are now on reeon3 and are subnitfed for ymr considemtic 1. If delivered instantaneously, Icx, r is the I, Sa. (Uedian Sidmera ' If delivered a t the rate of 20 r per bow, 150 r ia the M.S.D. 3. If dolivered at the rate of 10 r per bour, 200 r is the M. 39.
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1. Fifty per cent of the median siclmess dose is considered t o be a wartime military permiesible d-8. Ib otber rords, the InilitaFy code r my assme that Ff his troop receive 50 r instantaneouly, 75 c a t the rate of 20 c per hour, ar 100 r a t the rate of 10 r per hour, he w i l l hve no rriokness and thus no replacement problen. 5. The medfan lethal dose Is considered to be 450 r instantaneous 6. The lethal d o s e is considered to be 700 r delivered instantaneouslp. co Horr nnich of these damaging effects ahodd medical personnel accept h :,?anypolnts of hti8red related t o the abere discussed 'but bef OF e the meeting 888 mer It was evident that no one knew the %mea meu ? to8g of these questions. The real purpose of the meothg ""3 to obtain Inforto Col, James Cooney. Because of *e nafuce of the diBcuSsions, ettendanur a t the meting was restricted to those inoited to attend. Brftish data indicated that the mid-lsthal dose (IA.L.D.) of radiatim : for man i s about 150 roentgens. Stafford Warren gave data the afaoe bnbsd area of Japan t h a t indicated that the I.L.D. cas probabb lese thsn 300 roentgens for man, because those persone who lost all the hair (cq hf ev epilated) htd not sumrim. Dr. Paul R i k e r s iradimted that the W,LJ), for dogs was 300 to 350 roentgens, Louis Xtupplerna~gave data on the eccidenfs _, a t Los Alams that iadiaated prabeble ev sure as follower Died on 24th day; nausea after 24 hrj Fatigue shortly aftsr exposure. Vomited twice within 45 mhutem; died 9th day; im wed t o relieve peh, hands in 'bed shape. probably permanently rtarile.
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t. Robbins gme data on a ~ u v lwho had survived over 1UX Iy)zfIltga. Thus the M.L.D. is pmhw somewhere betwen 150 and IO00 roentgens. finel reeult of the meting was a tenfetfou, adoption of a conmdttee report Effect of Acuh Doses of Radiation Results i n oonvuleiona or death bed lately or soon after exposure. Ihcapadtates 100 per oent in 1 t o 3 hr. A l l Incapacitates 100 per oent for first 24 h3?. <50 per cant w i l l hold up to job for 2 weaka at vt ly redud effiaienay. 775 per cent (prabeblp 790 per amt) w i l l die inside of 6 aeeks. 10 per cent fneffeotlve for -1 week, 50 per
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and to resolve our different polnta uf d e w on t h i 8 aubjeat. Dr. Porkor wanted e unit expr0ssed i n ergs/oo of tissue; ~ r .F ailla wanted the OM rep; I wmted a unit lased on the masured loniwittion in an air cavity in tte medfm. After a long discuseion we fianq agreed a6 fobst 1, To retain the mentgen 88 a unit of quantity for I end gemma radiatlon where it I s applicable, 2, To recornend a new f'undamental unit, erga/gm of medium. 3, To recoxmend a new practical lmit wb ichi a a multiple of the Rtndanental d t end is defined as that amount of imlw radiation that delivers a dose of 93 ergs/gm of fde~Seto a point in tissne, This latter unit is mggested prharlly as e corrpenbnoe t o radiohgbtr. It iS equal In magnitude to the unit I had suggested earUer, b t It 18 defined as the onergy abeorbed in tissue rather than that in air. order to find it m e must bmmrt an ionisation mea- in a cavity chamber to this new unit the urn of certain perametem (relative mass stopping parser, Ion pairs per electron volt, etc.), To obtain the Malogfa31 damage oae must obtain in addition the epecffiu Ionization and the tlnte
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December 7 et 'Sen Frandam Be (Taylor, Parker, ?Jiltirrmg, and I) had another meeting on mdhtiort units and drew up 8 proposed r e p v to the I3ritiah proposal an units presented 1 &t with the Cdt tee on Uaits of the Rediological Society of North preeorrted and agreed upon after a drawn out df6CWdonDec em br8et Sna Francisco There opaa a meetfng of the Ereouttoe Comtttee of the Radiation PFotecthn Cod.ttee of the National Bureau of Standards, and of the subcom.ittee chairmen of the Committee on Radiation Protection by Jenuerp 15, 1949. I am to m s h data on the general level of mldmum pemdssiblb concentration of redioaoffve material in a i r and in water before the end of t h i s year and Charlea H. Pew and I nil1 get out a report for the permissible hers of satne of the radioleotopes during yeterlM9. Fallla will get out his report on meldmilm permissible external exposures aarly next year. The new mwdnmn ~ ~ eds sib l eexposure level to X and gemma radiation will probably be 0.3 r . per week for total body exposure, 0.5 r per week to just the skin (indde tlp horny layor) and probably about 1,O r per we k just to the hends, Aliat of names wad sugeested for a new Com ltte e on tiaste Diaposel, Plana were mde t o get out a revised bookbt The particle pToblem has been of major importanoe and has lead t o difficult decisions. Particles have been found atpat distances (hundred8 of miles). kfhagr of the particles &PB insoluble in mer. The sand filten, aeem to be wa3dng satis fedor fly, Faotora of lo* selective atsorption of radioiaotopea i n fish Tbere rere no important new bhrument developments. T W bavo a new partable poppp that is promising, They b e an impKIoed method of beta mnitorizq for the waste water. I : .
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4. Thcry have l nter eaf ing flzree dim mio d mphs glvine the flm of fission prodwte and plutonium fkom their holdfng tang8 that BIO 5. They have obteined information Fram a l l the &mf& K O r k 8 ' p.nomel hurled in the pod. There is an elaborate building program under way a t Henford. I think we should make a similar inveetigstion e t tRNL.