Data from a series of unaltered as well as crushed sherds and one clay sample produced results that indicate no radon loss to within the experimental accuracy. Radon loss in ceramics was investigated by direct measurement of gamma-rays originating in the uranium and thorium decay series. Thermoluminescence dating is explained. Previous research on radon-loss is reviewed. This alternative method measured directly the gamma rays emitted by all the radioisotopes naturally present in sherds, calculated the gamma emission rates from radioisotopes preceding and following the radon in the natural series, and compared these rates in cases where the escape of radon was (a) prevented and (b) favored. The results from several types of sherds are presented.