Measuring effective radium concentration with large numbers of samples. Part II - general properties and representativity

► We measured the effective radium concentration ECRa for more than 1570 samples. ► Dependence of the emanation factor on temperature and moisture content is revisited. ► We study dispersion effects from sample-scale, scarp-scale to kilometre scales. ► We are able to study the representativity of ECRa across formations and faults. ► The availability of large numbers of ECRa values opens new perspectives.