A Sample Monitor used at the Saskatchewan Research Council SLOWPOKE reactor. The monitor consists of a counting module and a Geiger Mueller tube mounted inside a heavy shield. The module measures 25 cm in width, 19 cm in depth and 10 cm high at the rear. It then tapers to 2.5 cm in height at the front. The shielded detector assembly sits in a 25 cm long container with a 3 cm diameter hole through which the sample can be passed to be placed in front of the detector window. A partially shielded section, about 10 cm in length, protrudes beyond the main shield block. The unit was offered by the SLOWPOKE manufacturer, AECL Commercial Products Division, Kanata, ON, as optional equipment.