Abstract
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 10Be ( t 1 2 = 1.5 Myr ) and 26Al ( t 1 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/HNO 3 mixture in a heated ultrasonic tank. The purified quartz was also used for the measurements of in-situ -cosmic-ray-produced 21Ne and 14C ( t 1 2 = 5730 myr ). The method is applicable to any problem requiring purified quartz on a large scale.
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