Precise trace rare earth analysis by radiochemical neutron activation
A rare earth group separation scheme followed by normal Ge(Li), low energy photon detector (LEPD), and Ge(Li)-NaI(Tl) coincidence-noncoincidence spectrometry significantly enhances the detection sensitivity of individual rare earth elements (REE) at or below the ppB level. Based on the selected ..gamma..-ray energies, normal Ge(Li) counting is favored for /sup 140/La, /sup 170/Tb, and /sup 169/Yb; LEPD is favored for low ..gamma..-ray energies of /sup 147/Nd, /sup 153/Sm, /sup 166/Ho, and /sup 169/Yb; and noncoincidence counting is favored for /sup 141/Ce, /sup 143/Ce, /sup 142/Pr, /sup 153/Sm, /sup 171/Er, and /sup 175/Yb. The detection of radionuclides /sup 152m/Eu, /sup 159/Gd, and /sup 177/Lu is equally sensitive by normal Ge(Li) and noncoincidence counting; /sup 152/Eu is equally sensitive by LEPD and normal Ge(Li); and /sup 153/Gd and /sup 170/Tm is equally favored by all the counting modes. Overall, noncoincidence counting is favored for most of the REE. Precise measurements of the REE were made in geological and biological standards.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6256351
- Report Number(s):
- PNL-SA-9143; CONF-8106153-1; ON: DE81030009; TRN: 81-016804
- Resource Relation:
- Conference: Modern trends in neutron activation conference, Toronto, Canada, 5 Jun 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CERIUM
ACTIVATION ANALYSIS
SEPARATION PROCESSES
ERBIUM
EUROPIUM
GADOLINIUM
HOLMIUM
LANTHANUM
LEAVES
LIVER
LUTETIUM
MAIZE
NEODYMIUM
PRASEODYMIUM
SAMARIUM
SOILS
TERBIUM
THULIUM
VEGETABLES
YTTERBIUM
NEUTRON REACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
BARYON REACTIONS
BODY
CEREALS
CHEMICAL ANALYSIS
DIGESTIVE SYSTEM
ELEMENTS
FOOD
GLANDS
GRAMINEAE
GRASS
HADRON REACTIONS
METALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
ORGANS
PLANTS
RARE EARTHS
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
400102 - Chemical & Spectral Procedures