The Department of Defense, through the Air Force Research Laboratory (AFRL) at Wright-Patterson Air Force Base, is seeking responses to a Sources Sought notice for the procurement of a Ludlum 44-10 Sodium Iodide Nal(TI) Detector. This detector is essential for measuring gamma radiation energy, specifically from cesium-137, and is part of the OE Modernization Plan aimed at replacing outdated instrumentation to enhance environmental monitoring capabilities. Interested small businesses are encouraged to submit capability packages detailing their qualifications and relevant experience by December 2, 2024, at 12:00 pm Eastern Standard Time, with submissions directed to Jason Sav at jason.sav@us.af.mil.