From 1980, De Laeter was elected in the IUPAC Commission on Isotopic Abundances and Atomic Weights, serving as the Secretary of the Commission from 1984 1987 and as its chairman from 1988 1991.
22.
It had 62 TeO 2 crystals ( 11 kg of 130 Te ), with some crystals enriched in 130 Te and others with natural isotopic abundance, and some slightly larger and some smaller crystals.
23.
Today, the r-process abundances are determined using their technique of subtracting the more reliable s-process isotopic abundances from the total isotopic abundances and attributing the remainder to the r-process nucleosynthesis.
24.
Today, the r-process abundances are determined using their technique of subtracting the more reliable s-process isotopic abundances from the total isotopic abundances and attributing the remainder to the r-process nucleosynthesis.
25.
It is distinguished from allogenic neon ( that is, neon created in other ways ) by its isotopic abundance, since solar neon is created directly via nuclear fusion, instead of via planetary nuclear fission.
26.
By carefully scrutinizing the table of nuclides, they were able to predict the existence of different stellar environments that could produce the observed isotopic abundances, and the nuclear processes that must occur in these stars.
27.
Another method that utilizes EI is isotope ratio mass spectrometry ( IR-MS ) this instrumentation incorporates a magnetic sector analyzer and a faraday-collector detector array and separates ions based on their isotopic abundance.
28.
Through DNP, transfer of polarization and relevant signal enhancement can occur from the protons of the solvent batch to the rarer nuclei at natural isotopic abundance on the surface framework, including species covalently bonded to the latter one.
29.
It is also the rarest isotope in the Universe, taking into account the elemental abundance of tantalum and isotopic abundance of 180m Ta in the natural mixture of isotopes ( and again excluding radiogenic and cosmogenic short-living nuclides ).
30.
After Clayton's 1989 move to Clemson University, his research with Bradley S . Meyer showed how the uniquely puzzling 48 Mo isotopes of the element molybdenum had become dominant in supernovae stardust, explaining an experimental riddle in stardust isotopic abundances.
