The pulse height analyzer eliminates which signals that are not within a preset energy range?

• A. X signals
• B. Y signals
• C. Z signals
• D. Time signals

Answer: (C)

The pulse height analyzer uses energy discrimination. It measures the height of each pulse, which is proportional to the energy deposited by the photon in the detector. By setting a window with a lower and upper threshold, only pulses whose height (energy) falls inside that window are allowed to pass on. All pulses with energies outside this preset range are suppressed, so signals outside the energy window are eliminated. This is why the device specifically targets and removes those outside-energy signals, leaving only the desired energy range for analysis.