Tin and Antimony Isotopes of Mass 129 in Fission

Birgül, O.; Lyle, Samuel J.

doi:10.1524/ract.1967.8.1.9

Cited by 11 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reorientation of the bonds would lead to a redistribution of the oxydation states of the involved chromium atoms, which is always statistically favourable to the formation of a radioactive Chromate configuration. In previous work [1] the cumulative fission yield of 129 Sb was measured radiochemically for thermal neutron induced fission of 236 U and a value of 0.39% was obtained. It was compared with other values reported earlier; these were 0.4% [2], 0.2% [3] and 1.12% [4], More recently, ERDAL et al [5] reported 0.62% for this cumulative yield, a value which is not in accord with any of those given above.…”

Section: Resultsmentioning

confidence: 99%

“…Another way of approach which might be promising is to duplicate the situation of the recoil atom by artificial doping of the crystals. Based on the assumption that the recoil atom is in a chemically reduced state, a temptative explanation of the increase of the retention on annealing was suggested invoking a transfer mechanism within the solid state [1], It has been observed that 61 Cr(III) traces, when integrating themselves into an inactive potassium Chromate lattice, will keep their oxidation level at normal temperature. On heating these crystals the radioactivity will gradually be recovered in the form of Chromate.…”

Section: Résumémentioning

confidence: 99%

“…The 129 Sb was isolated in the presence of a minute amount of isotopie carrier as Sb 2 S 3 which, following ERDAL et al [5], was dissolved in aqueous ammonia instead of, as previously [1], dilute hydrochloric acid. This ammoniacal solution was standardized using the 4 π ß-i&y proportional counter to determine the activity absolutely and it was also used with more isotopie carrier to prepare Sb 2 S 3 sources of known specific activity for counting under the end-window proportional counter [I].…”

Section: The Radiochemical Determination Of Cumulative Yields At Massmentioning

confidence: 99%

See 2 more Smart Citations

Transfer and Exchange of Trivalent Chromium in Solids

1971

View full text Add to dashboard Cite

Man kann daraus schließen, daß die Wassermoleküle auch im Alaun sehr beweglich sind -ähnlich wie im flüssigen Wasser -, während durch die Gerüststruktur des Alauns der niedrige Frequenzfaktor bedingt ist.Herrn Dr. K. HEUMANN danken wir für die Hilfe bei den massenspektrometrischen Untersuchungen. Dem Deutschen Kunststoff-Institut sind wir für die Über-lassung des Mikrotoms zu Dank verpflichtet. SummaryIt is suggested that the increase of retention on annealing above 100 °C in neutron irradiated chromâtes may be explained by a solid state transfer mechanism. A re-orientation of the oxygen bonds around the intruder chromium can alter the oxidation state of the latter. Also in a potassium sulfate matrix doped with Cr(III), Chromate ions are formed on heating.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Résumémentioning

confidence: 99%

Section: The Radiochemical Determination Of Cumulative Yields At Massmentioning

confidence: 99%

See 1 more Smart Citation

Transfer and Exchange of Trivalent Chromium in Solids

1971

View full text Add to dashboard Cite

show abstract

“…Because of uncertainty in y?-decay energetics for 129 Sb, the counter was calibrated directly for 129 Sb -129 Te in equilibrium by preparing a series of solid samples for counting from a solution of these isotopes of high specific activity standardised by the ^-proportional counting method. The 12fl Sb efficiency was then calculated by allowing for the 129 Te efficiency estimated from the BAYHUBST and PBESTWOOD type curves [12]. Nuclear data relating to the decay chains of interest in the yield measurements were taken from the compilations of KATCOFF [13], HEBBMANN [14] and the Nuclear Data Sheets [15], Relative yields were derived from decay curves as described in an earlier paper [3].…”

Section: Counting Procedures and Evaluation Of Resultsmentioning

confidence: 99%

Radiochemical Studies of 3 and 14.8 MeV Neutron Induced Fission of ²³¹Pa

Birgül

Lyle

1969

Radiochimica Acta

View full text Add to dashboard Cite

8 MeV Neutron Induced Fission of 231 Pa Radiochimica Acta = 0,693147.) Nous avons ainsi obtenu la valeur 32713 ans. Afin d'estimer la precision de ce resultat, nous avons admis que les masses du calorimetre et de 1'enveloppe la source sont connues a 1 mg pres, et la chaleur specifique de l'or et celle du pentoxyde de protactinium respectivement ä 0,0001 et 0,005 cal g _1 degre C _1 pres; la masse du protactinium a 6te consideree comme precise ä 0,3 % pres, ceci 6fcant le pourcentage d'impuretes dosses. On peut ainsi obtenir les erreurs maximums sur Μ et m; ces erreurs multipliees par 1 j 2 nous ont fourni les estimations des erreurs quadratiques moyennes respectives. Finalement, l'erreur quadratique moyenne sur Τ a ete calculee par la formule de la propagation des erreurs. On obtient ainsi Τ = 32713 ± 110 ans.L'exactitude de cette valeur depend essentiellement de l'exactitude de la valeur de l'energie moyenne des particules alpha du protactinium ainsi que de la contribution 6nerg^tique de son rayonnement gamma que l'on prend pour les calculs. Nous avons pris E x = 4,966 Mev qui parait etre actuellement la valeur la plus süre; KIRBY avait choisi 4,948 Mev. II est interessant de remarquer que les donnees de KIRBY traitees avec E x = 4,966 Mev conduiraient kT = 32591 ans. Ainsi, ces deux determinations calorimetriques de la periode du protactinium, qui ont ete effectu^es independamment, se trouvent en bon accord du point de vue experimental. Remerciements Les auteurs remercient Monsieur LECOIN qui a sugg6re ce travail pour les conseils qu'il a prodiguös et les discussions qu'il a suscitees, ainsi que Monsieur VERNOIS et Monsieur HUSSONOIS qui ont effectue respectivement les contröles de puret0 chimique et radiochimique de la source. SummaryThe cumulative yields of 10 nuclides from the fission of 231 Pa by 3.0 ± 0.4 MeV neutrons have been measured radiochemically using a recoil method. The yields obtained agree well with those previously reported by IYER et al.[1]; all fit on a highly asymmetric yield curve having a peak to trough ratio of about 100 and a peak width at half-height of 14 mass units. The maxima of the light and heavy peaks fall at masses 91 and 138 with peak yields around 7.2%. The relative widths for exactly symmetric fission and for neutron re-emission are compared with a term depending on the energies available for both processes in a correlation previously demonstrated for 14 MeV and now extended to 3 MeV neutron induced fission of heavy nuclides. 231 Pa appears to be an exception and the fission cross-section for 14.8 MeV neutrons estimated to be 1.4 ± 0.1 barns by a radiochemical method is used in a discussion of this result. ZusammenfassungFür 10 Nuklide, die bei der Spaltung von 231 Pa mit Neutronen der Energie 3,0 + 0,4 MeV entstehen, wurden die kumulativen Ausbeuten radiochemisch mit Hilfe einer Rückstoßmethode gemessen. Die erhaltenen Ausbeuten stimmen gut mit Ergebnissen überein, die von IYER et al. [1] mitgeteilt wurden. Alle Daten liegen auf einer asymmetrischen Ausbeutekurve, die ein Max...

show abstract