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In the Lucas cell case a short accumulation time was used (10-15 minutes). The thoron concentration under accumulation volume was measured immediately after the sample gas extraction and a regression equation is used for determining equilibrium thoron concentration.
In the case of charcoal method the thoron was measured 4 hours after a special degassing of the sample. Using the LUK-3A device for the building materials, the thoron flux was measured only on a special enhanced thorium+radium sample
1. INTRODUCTION
The radon isotopes 220Rn (thoron) and 222Rn (radon) were intensely studied in the last time due to their involvement in the lung cancer risk [1] and also for geological purposes [2]...
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