A 38 cm by 48 cm mat-backed photo of a CRNL technologist making measurements on a non-active glass block used for trials in 1959 and 1969 for the immobilization of fission products for underground storage. In actual practice, the highly radioactive wastes, in a hot “glass melt”, would be poured into the ceramic vessel in a shielded area. The cooled blocks would then be removed from the crucible and buried for long-term tests on the leaching rates of the fission products to soil and groundwater. The photograph on the right details the immobilization procedure.
