http://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=8303865B1&KC=B1&FT=D&ND=&date=20121106&DB=&locale=en_EP
Inventor: CRAVENS DENNIS [US] SUMMARY OF THE INVENTION The inventive subject matter includes a composition of matter and methods of producing a composition of matter, where the composition has an adjustable emission rate. In one aspect of the inventive subject matter, a composition comprises metallic ions and a radioactive material disposed in a ceramic matrix. The composition has a first natural emission rate when unexposed to Hydrogen. When the composition is exposed to a hydrogen isotope, preferably in gaseous form, the composition's emission rate increases. Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
