Rapid determination of dysprosium in rock samples by neutron activation analysis with a ge(li) detector after chemical separation

✍ Scribed by Kenji Tomura; Hideo Higuchi; Nakoi Onuma; Hiroshi Hamaguchi

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 481 KB
• Volume: 42
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(01)80330-5

✦ Synopsis

Simple, convenient and sensitive analytical methods for lanthanides in rock samples are important in geochemical studies, because the chondrite-normalized lanthanide pattern (the ratio of each rare earth abundance to the abundance of the same element in chondritic meteorites) is helpful in the interpretation of the evolution of various types of rocks 1. In recent years, high-resolution lithium-drifted germanium detectors (Ge(Li) detector) have been applied to neutron activation analysis for the lanthanides in rock samples by several authors"-4. However, the determination of dysprosium by non-destructive neutron activation using Ge(Li) y-ray spectrometry was not successful because the gs-keV ia6Dy peak was obscured by the presence of the Bremstrahlung and Compton background from 6Ql.n and "4Na as pointed out by CORB~ and by GORDON et al.3. In the analytical method involving a Ge(Li) detector and chemical group separation reported from this laboratory 4, the.simultaneous measurement of 105Dy (2.3 h) together with the other lanthanide nuclides was difficult because of the contribution of activities from the other rare earth nuclides due to long irradiation.

In the present paper, a procedure is described for the determination of dysprosium in rock samples with a Ge(Li) detector after a short sample irradiation and rapid chemical separation by conventional precipitation.