A new three-stage mass spectrometer for high abundance sensitivity measurements

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

“…Thermal ionization mass spectrometry (TIMS) [72,[108][109][110][111][112], inductively coupled plasma mass spectrometry [113][114][115][116][117][118][119][120], secondary ion mass spectrometry (predominately for particle or surface analysis) [71,54], accelerator mass spectrometry (predominately for high abundance sensitivity analysis) [10,[121][122][123][124], and resonance ionization mass spectrometry (high elemental selectivity) [19,[125][126][127][128] are frequently utilized for analysis of actinides and other radionuclides. Glow discharge mass spectrometry has been used for isotope ratio analysis of actinides, such as uranium [129][130][131], as well as fission-track TIMS for particles [132].…”

New FORTRAN computer programs to acquire and process isotopic mass spectrometric data: Operator`s manual

“…There is no way to suppress this. If you want to use a sum without having atom percents calculated, enter 0 for the normalizing mass, or use sum (2) or sum (3). It is not necessary to use sum(l) to use sum (2), and Sum 3 can be used whether or not there are entries for sum(l) and sum (2).…”

“…Another common application of this feature is in thorium analyses, where the 230 spike isotope does not occur in the sample. The program identifies this mass by finding which mass appears in sum(l) that does not appear in sum (2). In the example in Table 3 Failing to follow these instructions will cause unpredictable results.…”

“…The first sum must contain all isotopes of the mixture of spike and sample; the second sum must contain the isotopes of only the unspiked sample. There must be at least one isotope in sum(l) that isn't in sum (2), and it must be the spike isotope. This is all pretty simple in practice.…”

Rheodyne

“…we have had several of them in operation for a number of years (7)(8). Anal ysis of the two elements proceeds sequentially from a single rhenium filament.…”