| http://www.w3.org/ns/prov#value | - For example, an alpha emitter such as plutonium or americium may beencased in a layer of a material that is transparent to alpha particles, i.e., a very thin, porous layer that may comprise, for example, porous glass or a porous polymeric material.It is to be understood that while the invention has been described in conjunction with the preferred specific embodiments thereof, the foregoing descrip
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