In such detectors, it is attempted to eliminate the absorption problems which result from the material of the shielding. Apart from a "low-level measurement" (shielded inherent radioactivity), a "low-absorption measurement" (Compton suppression) is to be made possible. This is achieved by the fact that the detector holder and the end cap enclosing it consist of plastic and a lead ring filling the clear width of the end cap is arranged on the continuous copper rod between the preamplifier and the detector holder, which ring is flush with the bottom wall of the lead housing when the cryostat is installed in the lead housing.
