National Institute of Standards and Technology, Acquisition and Assistance Division, Bldg. 301, Room B117, Gaithersburg, MD 20899

66 -- REPLACEMENT NEUTRON COLLIMATORS SOL 52SBNB6C9084 DUE 040196 POC Marilyn Carter (301) 975-6335/Pauline E. Mallgrave (301) 975-6330 The National Institute of Standards and Technology (NIST) has a sole source requirement for three replacement neutron collimator parts from Euro Collimators Limited (ECL) of Cheltenham, Gloucestershire, England. The first set of collimator parts is for a radial oscillating collimator designed by NIST which will be assembled by ECL from mechanical parts jointly supplied by NIST and ECL. This radial collimator has a radius of 300 mm with an internal height of 250 mm, a width of 100 mm, and an acceptance angle of 170 degrees. The 84 vanes which make up the collimator are made of stretched polyester 0.10 mm thick, coated with 6 layers of gadolinium oxide. The body of the collimator is made of aluminum. The second group of collimator parts is for a linear collimator with an angular resolution of 7 minutes. Its internal dimensions are 124 mm high, 28 mm wide and 597 mm long. It has aluminum vanes 0.05 mm thick coated with gadolinium oxide. It has a mild steel frame 597 mm in length, 174 mm high, and 48 mm wide. The third set of collimator parts is also for a linear collimator with an angular resolution of 60 minutes. Its internal dimensions are 102 mm high,19 mm wide and 305 mm long. It has Melinex vanes 0.05 mm thick coated with gadolinium oxide and has a mild steel frame 305 mm in length, 126 mm high, and 57 mm wide.--Delivery 12 weeks after award of contract--FOB Destination Gaithersburg, MD--Statutory authority is 41USC 253(c)(1)--Only one Responsible source that can meet the requirements of the Government--See Note 22. (0044)

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