Technical Associates products

Model GD-6X2M 4 pi gas flow counter is a high precision dual chamber instrument for accurate measurement and calibration of radioactive sources and isotopes. The two proven GD-6 hemispheres are accurately formed and polished and furnish long, flat alpha and beta plateaus. Since the radioactive sample being measured is deposited on a thin conducting film carrier, self-absorption and backscatter are both eliminated. Operation with Geiger gas (99.05% Helium 0.95% Isobutane) provides equal pulse size for all counted radiations, but loses the ability to separate isotopes by radiation type or energy. Operation with proportional gas (P-10 90% Argon 10% Methane) allows samples of higher counting rate.

Consists of a 12`` diameter cylinder with horizontal axis roughly 30`` long, and mounted to a base. The animal chamber is then 6`` in diameter by 6`` long. Ventilation ports are provided. A drawer in the side of shield provides a 4 3/4`` x 4`` opening⁽¹⁾ to insert and remove the animal. The chamber has a removable stainless steel liner for ease of cleaning, and a removable grating is provided for the animal to stand on, and for the droppings to fall through. The thin metal windows on the two detectors are protected by metal grills with a high percentage of open area. Each detector is surrounded by 2`` of lead on all sides. The detectors are also recessed for their own protection and to minimize effects of animal position on the count rate.