GAMMA-DOSE-RATE DETERMINATION IN LARGE-SA MPLE USING THE CODE MERCURE-IV

The gamma dose-rate is calculated in large samples of bitumen and conc rete using the code Mercure IV. The influence of the diameter, of the composition and of the number of sources are investigated. Experimenta l dose-rate measured in air can be directly applied to bitumen and bit uminisates but not to denser materials like binder and hematite-concre te. The dose-rate homogeneity is correct for diameters below 15 cm for bitumen, 14 cm for bituminisates, 12 cm for binder and 9 cm for hemat ite-concrete.