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The method of  227 Ac extraction and purification from high-grade uranium ore and the test results of solid  219 Rn source made from  227 Ac are reported in this paper. With five years of follow-up monitoring, radiochemical purity of  227 Ac and the emanation power of solid  219 Rn source has been checked by emanation method and  γ -spectrometry, the results showed that  228 Th,  231 Pa and  226 Ra have been effectively removed and the emanation power of  219 Rn source is about 80%. The long-term test results also showed that the  219 Rn emanation rate remains stable in a wide air humidity range (40% ∼ 90%). Though the  219 Rn source has not been accurately calibrated yet, it has been applied in the research for delay coincidence measurement of  223 Ra.

Extraction and purification of 227 Ac and development of solid 219 Rn source