A new method for determining clay minerals is described. The method is based on the high adsorbing power of clay minerals. The minerals are allowed to deposit on a photographic film through a diluted radium bromide solution. The clay minerals thus become radioactive whereas the other minerals remain non-radioactive. On the developed film the radioactive minerals distinguish themselves.
En ny metode til bestemmelse av innbyrdes mengdeforhold mellom visse finkornige mineraler.