The government intends to award a sole-source, firm-fixed-price purchase order to Mirion Technologies Inc. for hardware and software support, onsite services, upgrades, and training for nuclear measurement equipment used at National Institutes of Health sites. This action is justified because Mirion holds proprietary rights and is the only source for factory-trained technical services and certified parts for its systems. The performance period is from September 25, 2026 through September 24, 2027, with four option years. No other competitive proposals will be solicited, though responsible sources may submit a capability statement for consideration. The work supports compliance with NRC regulations for radioactive material analysis.