JPNM Physics

NaI(Tl) Spectra for 511 keV Photons

NaI(Tl) Crystal Spectra in the following configurations:

• No collimator, source collimation - 511 keV (Ge-68)
• No collimator, source collimation - 662 keV (Cs-137)
• No colliimator, minimal scatter - 511 keV (Ge-68)
• With collimator - 511 keV (Ge-68)
• With collimator, through "patient" - 511 keV (Ge-68)
• With collimator, backscatter from "patient" - 511 keV (Ge-68)

Note: the crystal thickness for these measurements was 0.375".