Stalin Posted February 28, 2020 Report Share Posted February 28, 2020 (edited) A tool that calculates the DAC (Derived Air Concentration) Explaining ... Long Lived Radioactive Dust (LLRD) is something totally different than radon progeny. You inhale radon progeny and, after a few hours, it will all have decayed and nothing is left in your lungs. LLRD is fine uranium ore. It has a half life of a few billion years. So, it stays radioactive in your lung longer than radon progeny. As a result, the dose per unit intake is higher and the allowed intake is lower. A “DAC” is concentration that, if you breathed it all year, would give you 20 mSv dose. LLRD concentration are difficult to predict. LLRD is controlled by keeping the ore wet when loading etc and standing up-wind of drilling etc. Edited February 28, 2020 by Stalin Quote Link to comment Share on other sites More sharing options...
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