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The National Institute of Standards and Technology (NIST) has a requirement for a californium calibration source per the minimum technical requirements set forth in the NIST requirements document. The... The National Institute of Standards and Technology (NIST) has a requirement for a californium calibration source per the minimum technical requirements set forth in the NIST requirements document. The Contractor shall deliver a quantity of one Californium-252 (Cf-252) neutron source to be used for neutron instrument calibrations in the NIST heavy water moderating sphere, inclusive of FOB Destination delivery. Please see attachments for complete notice details.