A NaI(Tl) gamma camera has a measured photopeak FWHM of 21 keV at 140 keV. What is the percent energy resolution?

A NaI(Tl) gamma camera has a measured

Multiple choice — select the best answer

A6.7%
B12.0%
C15.0%
D21.0%

✓ Correct answer: C. 15.0% Percent energy resolution = (FWHM / photopeak energy) × 100 = (21 / 140) × 100 = 15%. Typical NaI(Tl) cameras achieve 9–12% at 140 keV; 15% indicates some degradation but is still within broad acceptance limits.

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A NaI(Tl) gamma camera has a measured photopeak FWHM of 21 keV at 140 keV. What is the percent energy resolution?

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