ENTRY 30351 20091116 31433035100000001 SUBENT 30351001 20091116 31433035100100001 BIB 14 40 3035100100002 TITLE Determination of isomer cross-section ratio for (n,g) 3035100100003 reaction on Te-120 using a radiochemical method. 3035100100004 AUTHOR (M.Jimenez,C.Archundia,S.Bulbulian) 3035100100005 INSTITUTE (3MEXINI) 3035100100006 (3MEXMEX) Centro de Estudios Nucleares, Ciudad Univ. 3035100100007 REFERENCE (J,RRL,25,327,197605) 3035100100008 FACILITY (REAC,3MEXINI) 3035100100009 INC-SOURCE (REAC) Triga Mark III reactor of Nuclear Center, Sazar 3035100100010 INC-SPECT Irradiation time of about 6 hours with an approximate 3035100100011 neutron flux of 2. X 10.**12 n/cm2/sec. 3035100100012 SAMPLE Natural 99% purity metallic tellurium, 20 gram. 3035100100013 METHOD (ACTIV) Activation. 3035100100014 Author's note: Since chemical changes occuring in 3035100100015 molecules where an atom is affected by an internally 3035100100016 converted isomeric transition can be detected, it is 3035100100017 possible to use the difference in the oxidation 3035100100018 state of the metastable and ground state isomers in 3035100100019 order to obtain its separation and therefore, an 3035100100020 indirect measurement of activation cross-section 3035100100021 ratio. 3035100100022 Chemical oxidation of the radioactive materials (such 3035100100023 as Te-121m and Te-121g) to telluric acid gives 3035100100024 'hexavalent' tellurium in both metastable and ground 3035100100025 state species, whereas isomeric transition produces 3035100100026 'tetravalent' ground state species. = 3035100100027 DETECTOR (GELI) Ge(Li) detector. 3035100100028 PART-DET (DG) Decay gammas. 3035100100029 COMMENT Equal aliquot of the original telluric acid solution, 3035100100030 which contained the equilibrium amount of Te-121 3035100100031 ground state isomer was used as the standard of 3035100100032 analysis. 3035100100033 STATUS (TABLE) Radiochem.Radioanal.Letters,25(5/6)(1976)327. 3035100100034 (APRVD) Approved by Archundia, with his remark on 3035100100035 'comment', 1977/02/15. 3035100100036 HISTORY (19760921C) KO. 3035100100037 (19770324U) KO. -'Approved' added.Insertion of comment 3035100100038 amendment after memo 4C-1/111 (data heading 'data' to 3035100100039 'ratio' in sub-entry .002.- 3035100100040 (20090115A) BIB section updated 3035100100041 (20091116U) On. 3MEXCNM -> 3MEXINI and 3MEXMEX added 3035100100042 ENDBIB 40 0 3035100100043 NOCOMMON 0 0 3035100100044 ENDSUBENT 43 0 3035100199999 SUBENT 30351002 20090115 31343035100200001 BIB 3 5 3035100200002 REACTION (52-TE-120(N,G)52-TE-121-M/G,,SIG/RAT,,SPA) 3035100200003 DECAY-DATA (52-TE-121-M1,150.D) 3035100200004 (52-TE-121-G,17.D) 3035100200005 ERR-ANALYS (DATA-ERR) Relative deviation from the mean value of 3035100200006 a set of several identical experiments. 3035100200007 ENDBIB 5 0 3035100200008 NOCOMMON 0 0 3035100200009 DATA 3 1 3035100200010 EN-DUMMY DATA DATA-ERR 3035100200011 EV NO-DIM NO-DIM 3035100200012 2.5300E-02 9.2000E+00 1.7000E+00 3035100200013 ENDDATA 3 0 3035100200014 ENDSUBENT 13 0 3035100299999 ENDENTRY 2 0 3035199999999