14 dating liquid scintillation counter

PAC levels are software selectable, and determine the amount of pulse amplitude variation that may be tolerated.

For further information, including about cookie settings, please read our Cookie Policy .These background factors limit the accuracy, precision, and range of the radiocarbon dating method because finite ages can only be calculated where sample activity is at least 3 standard deviations above background activity (Gupta and Polach, 1985).Consequently, each of the components of the LS counting system needs to be totally optimised for low-level counting, so as to maintain high counting efficiency whilst significantly reducing the background.The Quantulus has been designed with state-of-the-art electronics that includes short coincidence resolution time, two-position coincidence bias, and pulse comparison analysis. All LS counters with horizontally-opposed PMTs record pulses initiated within each PMT only if they fall within a set coincidence resolution time interval.This reduces the possibility of pulses generated within either tube being recorded as genuine decay events, and results in a lowering of background levels.

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

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