DRAFT eee radiation to 25 cpm. The sample plenchet was mountcc ina plastic and aluminum shield to reduce scattering anc bremsstrahlung. Gamna rediation was detected and counted with a lead shielded RCA 5819 photomultiplier tube and a 14 inch diameter scdium iodide scintillation crystal. Both beta and gamma counters were connected to a decade scaler. Gama energy spectrum studies were made with a vell type scintillation counter, single channel pulse height enalyzer, and @ decade scaler. 2e2 SAMPLE PREPARATION AND COUNTING The samples to be counted for radioactivity wore weighed, dessicated, dried at 110°C, in sowe cesses ashed, and counted on aluminum planchets. The self-abserption veriation due to- é (a “ ct $3] Q & rh oO oy ry fF o + y cb br x3 om & ks Q es Qo s s pve ob Ct SS Q caused some diffi Pe differences in rass and density of the varicus tyres of saunies enificantly affected by self sbsorption in samples of thesc thicknesses, gamza radiation is use@ in this report as 2p indication of the agucunt ef readio-« gotive elements present. “he ratio af sunma rays ieies hes not been accurately devernined roughly 1 to 2, The activity of the seuples wes compared with the activity of calibrated standard sources. The instrunent becksround was subtracted and the counts corrected to agree with the standerd source. The values are reported as gamma reys emitted per ninute per unit mass ef voluue cf sample abbreviated, cpm/g or epm/e. The prebable error in each counting rate was diffienlt to meintein-at a constant level. of oa ik In the case ef the water and /¢ ES