Contact: Dr. Rolf Behrens
rolf.behrens@ptb.de
49-531-592-6340
Physikalisch-Technische Bundesanstalt (PTB)
Caption: Results of the beta comparison measurements that have been carried out up to now. The lower and upper red-dotted limits and the red data points are valid for the very low-energetic radiation of promethium 147.
Credit: PTB
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