Add to ORKGA comparison has been made of the traditional gravimetric method for measuring the heavy mineral mass fraction in sand with a method based on the emission of gamma-rays from the uranium and thorium series by radiogenic heavy-minerals. The comparision reveals that beach sand along the Dutch coast may be divided into two provinces separated by the narrow ebb tidal channel of Texel. Sands from the two provinces differ in the composition of the heavy mineral suite and the specific activity for rather pure mineral groups. The ratio in activities between minerals from the two provinces is not constant for these rather pure mineral groups. The narrow region between the provinces indicates that longshore transport of heavy minerals has not been sig...