Two of the main radium isotopes found in the environment are radium-226 and radium-228. The current standards are: Combined radium 226/228 of 5 pCi/L A gross alpha standard for all alphas of 15 pCi/L (not including radon and uranium) A combined standard of 4 mrem/year for beta emitters. 88-Ra-226 Radium-226 Half-life: 1600 years Mode of decay: alpha into Rn-222 Decay energy: 4.871 MeV Subsequently radiation of Rn-222 at 186 keV possible 86-Rn-222 Radon-222, noble gas Half-life: 3. Sieber and his colleagues established the distribution of dissolved cadmium concentrations and isotopes in a section extending from Alaska to Tahiti. Uranium and thorium are found in small amounts in most rocks and soil. Over a period of 2 years, 9 cross-check 226 were received from the Quality Assurance sigma control limits.
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