The Defense Threat Reduction Agency (DTRA) intends to award a sole source contract to Sensor Technology Engineering, LLC (STE) for the procurement of two Linear Radiation Monitors (Part No. TA400). These monitors are critical for radiation detection and monitoring, and STE is the sole provider of this specific equipment, which underscores its unique capabilities in this field. Interested parties have five days from the publication date of this notice to submit written evidence of their qualifications to provide similar monitors, as the government will consider whether to conduct a competitive procurement based on the responses received. For inquiries, interested vendors should contact Zun Lin at zun.z.lin.civ@mail.mil or by phone at 571-616-5828.