The insertion into an animal tumor of buried capillary glass tubes containing radium emanation presents a comparatively new departure in radium therapy and is undoubtedly destined to play a prominent part in the future development of the whole field of radiotherapeutics. The technique employed on animals and human beings is as follows: Radium emanation, the first active product of decomposition...

The NIST (National Institute of Standards and Technology) has recently made available 222Rn emanation standards for test and evaluation. The NIST certified parameters include the ^ ~ a strength and the emanation coefficient. When such a source is loaded into a radon leak tight enclosure of a known volume, 222~n accumulates over time and it is possible to calculate precisely the time integrated ...