Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3583k&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 9, Sept. 1992, p. 3583-3587.
Physics
136
Chemical Reactions, Cosmic Rays, Geochronology, Quartz, Radioactive Isotopes, Aluminum Isotopes, Beryllium Isotopes, Carbon 14, Chemical Analysis, Neon Isotopes, Radioactive Age Determination, Rocks, Soils
Scientific paper
An isolation method relying totally on chemical steps was developed to separate large quantities (10-200 g) of clean mono-minerallic quartz samples from a variety of terrestrial rocks and soils for the purpose of measuring Be-10 (t1/2 = 1.5 Myr) and Al-26 (t1/2 = 0.705 Myr) produced by cosmic rays in situ in the quartz phase. The procedure consists of grinding the sample, heating it in HCl, and treating it with a series of leaches using a dilute HF/HNO3 mixture in a heated ultrasonic tank. The purified quartz was also used for the measurements of in situ cosmic-ray-produced Ne-21 and C-14 (t1/2 = 5730 yr). The method is applicable to any problem requiring purified quartz on a large scale.
Kohl C. P.
Nishiizumi Kuni
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