Determination of Barium and selected rare-earth elements in geological materials employing a HpGe detector by radioisotope excited x-ray fluorescence

Journal Article · Sun Jan 01 00:00:00 EST 1984 · Adv. X-Ray Anal.; (United States)

DOI:https://doi.org/10.1007/978-1-4613-2775-2_55· OSTI ID:5492567

LaBrecque, J J; Preiss, I L ^[1]

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1. Instituto Venezolano de Investigaciones Cientificas, Caracas. Dept. de Fisica Atomica y Molecular

The laterite material (geological) from Cerro Impacto was first studied by air radiometric techniques in the 1970's and was found to have an abnormally high radioactive background. Further studies showed this deposit to be rich in thorium, columbium, barium and rare-earth elements (mostly La, Ce, Pr and Nd). A similar work has been reported for the analysis of Brazil's lateritic material from Morro do Ferro to determine elemental compositions (including barium and rare-earth elements) and its relationship to the mobilization of thorium from the deposit using a Co-57 radioisotope source. The objective of this work was to develop an analytical method to determine barium and rare-earth element present in Venezuelan lateritic material from Cerro Impacto. We have employed a method before, employing a Si(Li) detector, but due to the low detection efficiencies in the rare-earth K-lines region (about 30 KeV - 40 KeV), we have decided to study the improvement in sensitivities and detection limits using an hyperpure germanium detector.

• OSTI ID: 5492567
• Journal Information: Adv. X-Ray Anal.; (United States), Vol. 27
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
BARIUM
GEOLOGIC DEPOSITS
HIGH-PURITY GE DETECTORS
SENSITIVITY
NIOBIUM
RARE EARTHS
THORIUM
ELEMENTS
VENEZUELA
X-RAY FLUORESCENCE ANALYSIS
ACTINIDES
ALKALINE EARTH METALS
CHEMICAL ANALYSIS
DEVELOPING COUNTRIES
GE SEMICONDUCTOR DETECTORS
LATIN AMERICA
MEASURING INSTRUMENTS
METALS
NONDESTRUCTIVE ANALYSIS
RADIATION DETECTORS
SEMICONDUCTOR DETECTORS
SOUTH AMERICA
TRANSITION ELEMENTS
X-RAY EMISSION ANALYSIS
360605* - Materials- Radiation Effects
440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
050200 - Nuclear Fuels- Exploration- (-1987)