In the Anger position logic circuit, how is the X, Y position of a gamma-ray interaction determined?

In the Anger position logic circuit, how is

Multiple choice — select the best answer

ABy the PMT with the highest single output voltage
BBy timing coincidence between opposing PMTs
CBy weighted sum of all PMT outputs proportional to their distance from the event
DBy measuring the transit time of light photons across the crystal

✓ Correct answer: C. By weighted sum of all PMT outputs proportional to their distance from the event Anger logic uses a resistor matrix (or digital equivalent) to compute weighted centroid positions. The X and Y coordinates are calculated from the fraction of light detected by each PMT relative to the total (Z-pulse), giving the centroid of the scintillation event.

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In the Anger position logic circuit, how is the X, Y position of a gamma-ray interaction determined?

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