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The LS vial is housed in a stepped stainless steel sleeve, which forms a light seal when the sample is loaded through the bottom of the shield assembly, by a low activity copper piston.

The counter components requiring optimisation are '...

Figure 1: Schematic diagram of Quantulus lead shield assembly and phototubes.

S = Sample PMTs; G = Guard PMTs The counting vial is placed into one of three trays located beneath the shield, and counting data (tray position number,1-60; sample identification number; counting requirements etc) entered into a laboratory computer.

shielding and electronics, data processing, data evaluation, and validation' (Polach, 1987; p.2).

The Quantulus achieves ultra-low background levels by both passive and active forms of shielding.

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