Abstract: A dual scintillation radiation detector having two different scintillation detector materials arranged and shaped in order to detect and determine the quantity of the two different radiations such as beta and gamma present within an unknown sample. The detector can be used in apparatus for laboratory use, manual portable probe applications, or in elongated probes for simultaneously reading radiation present as the probe is lowered into an earth bore. The scintillation radiation detector material for the high energy radiation is positioned on the opposite side of the first detector material from the radiation source so that the high energy radiation must penetrate through the first material before entering the second. This provision allows discrimination and filtering of the low energy radiation from the second detector material. The first detector material is provided in the shape of a thin, flat plate or in the shape of a hollow cup with the second material mounted on one side of the plate or within the cup.