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Efficiency calibration
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Uncharged radiations such as gamma ray photons must perform a significant interaction in the detector before detection is possible.

Due to these types of radiation travelling large distances between interactions, detectors are often less than 100% efficient.

The three main types of efficiency calibration are:

When calculating the efficiency of a detector at a specific time, the activity of the calibration source must be confirmed.

The activity correction due to the source's half-life must be performed using the decay equation.

[ Diagram here - advice needed for source ]


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