Ann an 1925, bha e a 'cumail sùil air radioactivity lag ann an sampall de potassium, eile alkali meatailt, agus a' co-dhùnadh gu mì-cheart gun robh eka-caesium a 'dèanamh truailleadh air an sampall (an radioactivity bhon sampall a bha bho nàdarra a' tachairt potassium radioisotope, potassium-40).
Eileamaid 87