The energy of the photon, 159 keV, is ideal for the NaI (sodium iodide) crystal detector of current gamma cameras and also for the pinhole collimators. It has much greater photon flux than 131I.
The energy of the photon, 159 keV, is optimal for the NaI (sodium iodide) crystal detectors used in modern gamma cameras and also for pinhole collimators. This energy level provides a greater number of photons compared to 131I.