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- Purification of kilocurie quantities of promethium-147 by ion exchange
- Ion exchange purification of promethium-147 and its separation from americium-241, with diethylenetriaminepentaacetic acid as the eluant
- Evidence of the absence of long-lived isotopes of promethium from fission of uranium, and the purification of promethium for the establishment of a primary spectrographic standard