Radioactivities ofNb99,Ta185, and

R.B. Duffield

¹

,

L. Hsiao

²

,

Eric N. Sloth

³

Abstract

M EASUREMENTS have been carried out by Bridgman 1 on the variation of resistance with pressure in tellurium, the resistance falling off by a factor of several hundreds in the range of measurements. As pointed out by Bardeen 2 this effect can be

Some New Isotopes of Antimony and Tin

“…Measurements of the relative response of other organic crystals, naphthalene, 1 stilbene, 3 terphenyl, 10 etc., and of organic solutions, 11 to different particles show that their behavior is similar to that of anthracene. Complete response curves for these materials, similar to Fig.…”

“…2, can therefore be obtained by the experimental determination of A and kB t and the subsequent computation described above for anthracene. It is also probable that the nonlinear response of inorganic crystals, like sodium iodide, 3 to heavy particles is due to a similar quenching effect, which is less marked because of the reduced radiation damage. A fuller account of this work is being published.…”

“…3 The resulting californium and berkelium isotopes were chemically separated from each other, from the target materials, and from fission products using the same combinations of precipitation and ion exchange methods as have been reported previously. 3 The final chemical separations were completed approximately 9 hours after the end of the bombardment.…”

Discovery of yttrium, zirconium, niobium, technetium, and ruthenium isotopes

“…"Forward emitted fragments from 80 Zn up to 155 Ce were analyzed with the Fragment Separator (FRS) and unambiguously identified by their energy-loss and time-of-flight." This experiment yielded 413, 81, and 10 counts, of 108 Nb, 109 Nb, and 110 Nb, respectively. (150), 112 Nb (22) and 113 Nb (8) were recorded.…”

“…The first observation of 105 The discovery of 109 Tc and 110 Tc was described by Trautmann et al in the 1976 paper "Identification of 109 Tc and 110 Tc in Fission of 249 Cf" [148]. A 249 Cf target was irradiated with thermal neutrons at the Mainz Triga reactor.…”