Table of Isotopes

Abstract

In most cases the class is determined by evaluating the uniqueness of the assignment through chemical separation, reaction type and yield considerations, genetic relationships, arid type of radiation. In a few cases newer techniques have been used. The term "m. s. " in the second column coincid. = measurements with gamma-gammacoincidence counters (for information on decay schemedata not necessarily used in the table); Be-y-e reaction =measurement of neutron energy from Be-y-n reaction;D-y-n reaction = measurement of neutron energy from D-y-n reaction. When internal-conversion electrons are emitted, the energy listed in this column is always that of the corresponding gamma-ray transition. Only the main gamma-rays are listed for the natural radioactive isotopes. In a few instances in which a very short-lived metastable state has been identified as the daughter of the isotope in 0.02V sec.(J11); 12(B4) cl.ch. 0.022 sec.(C2, B22) B-d-P(C2, Fi,BS) N18-n-a(J 2 2 ) C10 C11 20 sec.(S202) 20.5 min. (S8,T8); 20.0 min. (S83& 2(S202) abs. 0.95(D26) cl.ch, ; 0.99 No y(S97) coincid.{S82) spect.

Radiochemical Measurements of Activity Coefficients in Mixed Electrolytes

“…Measurements of the radioactive decay of the first two of these nuclides gave for the half-lives Nau",5.0 hr. and I<", 12.3 hr., in good agreenlent with accepted values (16,14). Two separately prepared sanlples of Rbs6 gave values of 18.7 and 18.5 days for the half-life.…”

“…However, when one component is present in very low concentration in the presence of a second electrolyte a t relatively high concentration, i t appears to us that Equation (14) Equation (14), and solved for i, the distance of closest approach. The results are given in Table VII.…”

Radioactive Tin 121, 123, 125

“…11 The above-mentioned 9-minute, 26-hour, 40-minute, 130-day, and 10-day activities recently have been given the evaluations B, A, D, C, and Z>, respectively. 12 It is the purpose of this paper to investigate more thoroughly these activities by using deuteron, slow neutron, and fast neutron bombardments of tin samples which have been electromagnetically enriched in Sn 120, Sn 122, and Sn 124, respectively.…”

Discovery of palladium, antimony, tellurium, iodine, and xenon isotopes

“…However, they did not explicitly state that they observed the (p,n) reaction rather than the (p,γ). In the 1948 Table of Isotopes [10] the assignment to 127 Xe was made based on the results by Creutz et al 128 …”

“…These databases are complete and reliable back to the early 1960's. For earlier references, several editions of the Table of Isotopes were used [8][9][10][11][12][13]. A good reference for the discovery of the stable isotopes was the second edition of Aston's book "Mass Spectra and Isotopes" [14].…”