Selective analysis of radionuclides by the delayed coincidence method
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The cascade process of decay of most radionuclides with corpuscular and photon radiation (β-α, α-ψ, β-ψ, ψ-ψ, α-x, β-x) with an average life-time of the intermediate states from 10−10 to some 10 sec, makes it possible to use the delayed coincidence method for selective analysis. Natural mixtures of radionuclides were analyzed for isotopes214Bi(RaC),212Bi(ThC),219Rn(An) and220Rn(TN)with the aid of instruments including scintillation detectors and a multichannel time selector by using β-α and α-α delayed coincidences, while isotopic ratio235U/235U in natural uranium was determined by using α-ψ coincidences. The instrument background did not exceed 1 pulse per hour per coincidence channel. Subjected to analysis were rocks with Clarks of radioactive elements.
KeywordsUranium Radon Thorium Decay Product Thoron
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