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Title: 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.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
6256351
Report Number(s):
PNL-SA-9143; CONF-8106153-1
ON: DE81030009; TRN: 81-016804
DOE Contract Number:
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Modern trends in neutron activation conference, Toronto, Canada, 5 Jun 1981
Research Org:
Pacific Northwest Lab., Richland, WA (USA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, 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