Providing information

A method for providing information on the dispersion of a radioactive material within a matrix includes measuring emissions of a first energy, the emissions including emissions of a first type, to provide a first type value; measuring emissions of a second energy, the emissions including emissions of a second type, to provide a second type value; measuring emissions of a third energy, the emissions including emissions of a third type, to provide a third type value; the interrelationship of the values for the first type value, second type value and third type value providing information on the dispersion of the radioactive material within the matrix due to the different effects of dispersion upon those different values.