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Ramer · Alavi Nuclear Medicine Technology

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384 Instrumentation and Quality Assurance33) The spatial resolution of an image is better with aenergy isotope than with a energyisotope.a. higher, lowerb. lower, higher34) If the energy range for 137 Cs at half maximum rangesfrom 620–695, what is the percent energy resolution,and is the system operating within acceptable limits?a. 7.5, nob. 10.8, yesc. 11.3, yesd. 13.5, no35) According to the curve for 137 Cs shown in Figure 4.1,what is the energy resolution of the system?a. 6.9b. 8.2c. 10.5d. 11.6Counts1200011000100009000800070006000500040003000200010000Figure 4.1560 580 600 620 640 660 680 700 720 740 760Energy (keV)

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