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This method utilizes eight 11-cm × 42.5-cm × 5.5-cm NaI(Tl) detectors, opted for due to their fairly large sensitiveness and availability and organized in an octagonal setup. The sensitive and painful volume of the system is ~28 cm in diameter and ~42 cm deep. Shielding consists of an 86-cm × 86-cm square, 64-cm-tall lead stone enclosure with 18-cm-thick lead walls lined by 0.3-cm-thick copper dishes. An aluminum top was machined to suspend the detectors within this