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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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papers oomplying with this oodtmealt. Others will be prepared as improved new reactor e become available for radiolaofope produoltian. 4. The twenty-five radioisotopes approved for possible cyolotrah produohim (as listed In Appendix D d AEC 196) area Fluorine 18, Vanadium 49, Manganese 62, Manganese 64, fliokel 578 Xenon 127, Lead 205, Astatine 211, Sodium 22, fron 66 f r e e of Iron 69, Iron 69 free of Iron 568 Arsenio 7% Arsenio 74, 84-hour Ihyptaa, Cobalt 66, Cobalt 67, Cobalt 58, S i l v e r 106, Iodine 126, Iodine 180, Rhenium 184, Oold 196, Thallium 202, and Bismuth 206. 5. To date, 018v1~1of twenty-fin, radioisotopes listed a b w e Bismuth 206 and Aetatine 211. Beryllium 7, Vanadium 49, Manganese 62, &geneas 54 6. Those radloisotopea whioh have been a x per ben tally produoed (neutron, proton) or (neutrea, alpha) reabtion, together w i t h the read ion anergies at which they wure produced and ham orosr seations are prorented tn tabular form balm.
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Reaction Cross Section 7. The 34-hour isotope o f krypton has recently been assigned a mass number of 79. Krypton 79 has been produced in the pile and the isotopic cross section of K r 70 found t o be 0.27 barn. Krypton 78 has a natural abundance of .342$. Calculations show that if vlo assume aflux of 2 x 1013 thermal neutrons (civen as the highest flux of the IIanford pile in H!424135), saturation activity wonlcl be about t o 13.3 microcurios par milliliter. Other radioisbtopes of krypton would also be present. The most ohjeotionable o f these would h e the 4.5 hour Krypton 85. Tne nc t iv it y of Kr 135 unclsr the above conditions would mount t o 212 mc per grnm of kryp%on o r 706 microcuries per milliliter. In ordor t o use theKr 79 atleast one of its halflives woiild b e wasted i n allovrinc the docay of K r 85. One o r more half-lives would he used i n packap,inp, and shipping. In order t o pro40 mc of K r 79 would naed
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t o be presmti at remavml fromhhe pile. This would regresenti a mlmn, of 4 liters of target mst sri rl r Thewefore, the voluan, of gar needed bo produce a usable amoab of Kr 7 9 would tmke i t s inmu80 The pose lb l ll ty of produation of onrrier-free bon 69 in the pile has been rather extcnsively investigated and a reoamwndatlon prepared in MonC-142, the oonolusion of whloh i s r ohemlcally pure Fa S9 by pile Irradiation does nub oompare iavorably with its pro dw tia a by fast neutron8 from the oyolotrm. In the latter oase a yield of 10 mioroouries per hour can be aohieved wibh a berm of 800 mloroamperer of 14 Msv deuteroar au a Be tar gat and 40 gams of oobalt dir6otly behhd bhe bmylliunb apprmthtrly a taotor of 10gro aba than the *on a otl vlt y under theas conditions meking se para tima simple operation." Thn 00 60 a otl vit y is Thio oonolurlon w&r drawn from the faat that the ratio of oobalt . a a fir it y to baa aotiritiy produoed under n out ra bomba rh t is about 1,000 t o 1. Thla would nmke a reparation of oobalh and iron diff i ou lt, iarpra&ioable and expenrive from t h e quantitabive standpoint unless g b Cobalt 68 har been produoed by the Niakel 58 (nap) reaotion. Produotion and rep arat lm of any qu m tl ty of Cobalt 68 in this manner
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would be d if ii ou lt, since Niakel 59 I s alao formed from the (n,{) re a a tie a ~1 N l 66. The croon recrhim Tor fImrmal asuttone ofthe (n,f) reaotilmr i o 4.6 barns as oampued toOi7 mlllibarn for the 10. Sodium 22 bas been produood ln t h e p i l e and the orour ileation extremly small neutron ab8orp*ion oroie 6 0 0 t b r 1 for a (n,an) reactto+ 0.008 mllllbaxn, the yield 16 very omsll. Calaulationr show that if , ane male of rodiummrs bmburded a t the highest appropriate flux II amllable for this rsaetim (6 x 1Ol2 16 giwn ia. Esr14lJS f o r ths ~ naxhm f l u x ef 0.5 Co 1 ~ 5Mer neutrons in the &ford p i l e ) Sor one I month, only @ adoroaurlen o f la 22 would reaultr Thlr would man a rp eo iii a acfitity of about 0.4 miosoourie psf &ram of total eo a iw \ iht raturatfan, the rp eo if loa at iv it y of Na 2 2 would be only about a t mioroewies per &ram M a would be rmsuitabls for blolagioal we, it6pr hal pal application. Tim oaloulatioara of yield mriy ba found 11. The urrnlum nuclear reaatws perm fly available for isotope oyolo~an-produoed'racliolaotopes approwd for d i & ri but ian mbr tha Atdo Energy Co dsl on tr ~ o lot ro aprogram,,
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SATURATIQ ACTfVITP JI? UIIUICURIES OF KRYFTm 79 PER OF XRYFTCN ASStNlNb FLUX OF 2 f 1015 TBERMAL NEUTR as PRODUCTIQJ OP Sc6zuM 22 FROM 1 MOL6 Na 2 1 ASTER WE M.H BOMBAFtDlbGBT ASSWINO AWXW FLUX OF 6 x 10le
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SATURATION ACTIVITY IN MILLICURIES OF KRYPTUBS 79 PliR ORAIM OF KRYPTON ASSOMIN G A F'LUX OF 2 x 1010 THERMAL NEOTRONS N o : Number of target atana Tlie density of Krypton a t S.T.P. (O°C 760 rn Hg) i s 5.708 grama
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Saturation aotivity of 1 gram of Xrypton 8B (4.5 hour) assuming 211.9 mo per gran, of Kr at aaturatlon -y: 795.72 miorocuries per milliliter
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PRODUOTION OF SODIUM22 m m 1 MOLE NP 28 No = lo. of target atoms Yo of Ba 22 : 8.02 x lo2$ x 6 x 5 5 x 1Ol2 (1 -3.7 x 10' Speaiffo a ot iv it y in p Saturation a ot iv it y would b e Zlk&'-$/gfy.