The Preparation of Line Sources of Radium G

Details The Preparation of Line Sources of Radium G The Preparation of Line Sources of Radium G

Oct 1924

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1924natur.114q.503h&link_type=abstract

Nature, Volume 114, Issue 2866, pp. 503 (1924).

Physics

Scientific paper

WHEN an active line source of radium C is required, the usual method of preparation is to seal a platinum wire into the end of a glass tube. Radium emanation is pumped into the tube with mercury, the wire being made the negative electrode with the mercury just beneath the wire forming the positive electrode. After a sufficient exposure, the emanation is pumped off, and the glass tube broken to remove the source. Even with quantities of emanation so small as 10 to 2.0 millicuries, the efficiency is very low, only 10 to 15 per cent, of the active deposit being found on the wire. This low efficiency is probably due to the distribution of the potential gradient along the wire. The drop takes place between the end of the wire and the mercury, while in the upper part of the tube there is practically no potential gradient. Thus most of the emanation is in a ``dead'' space.

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