Thick-source alpha counting can be used for the assay of low level U and Th in soils, rocks and similar materials. An effective method of preparing samples for this purpose is to fuse them in a lithium borate glass. The present paper discusses the loss of radon and polonium activity during fusion at elevated temperatures. A time dependent factor is given to correct for the loss of radon and polonium. © 1985.
Akber, R. A., Hutton, J. T., & Prescott, J. R. (1985). Thick source alpha counting using fused glass discs: corrections for loss of radon and polonium. Nuclear Inst. and Methods in Physics Research, A, 234(2), 394–397. https://doi.org/10.1016/0168-9002(85)90935-0