High-precision thorium RIMS for geochemistry

Conference · Sat Aug 01 04:00:00 EDT 1992

OSTI ID:10164550

Fearey, B L; Tissue, B M; Olivares, J A; Loge, G W; Murrell, M T; Miller, C M

We present our latest results in the development of resonance ionization mass spectrometry (RIMS) using cw lasers to measure isotope ratios of importance in geochemistry and geochronology. The RIMS method provides a higher ionization efficiency than thermal ionization allowing analysis of smaller sample sizes, while maintaining equivalent internal precision. The bias introduced in {sup 230/232}Th ratio measurements by the RIMS method when using narrow-band and broad-band lasers is discussed. Spectra of {sup 239}Th, which can be used as an internal standard, are also presented.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10164550
• Report Number(s): LA-UR--92-1841; CONF-920574--14; ON: DE92017405
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400102
400702
440800
47 OTHER INSTRUMENTATION
58 GEOSCIENCES
580000
AGE ESTIMATION
CHEMICAL AND SPECTRAL PROCEDURES
GEOCHEMISTRY
GEOSCIENCES
ISOTOPE DILUTION
ISOTOPE RATIO
LASER RADIATION
MISCELLANEOUS INSTRUMENTATION
PROPERTIES OF RADIOACTIVE MATERIALS
RESONANCE IONIZATION MASS SPECTROSCOPY
THORIUM 229
THORIUM 230
THORIUM 232
THORIUM ISOTOPES