BLHamrick@aol.com wrote: > > Does anyone know the average concentration of K-40 in human urine, or the > normal range of concentrations? > > Barbara L. Hamrick > BLHamrick@aol.com Ballpark recollection: 2000 pCi/litre Tap water: 250-300 pCi/litre Banana: 4000 pCi/litre russ russ