An attribute measurement system (AMS) is intended to acquire potentially sensitive data about a sensitive item but only display nonsensitive attributes derived from these data. The owners of the data, or hosts, must be confident that none of their sensitive information will be released; at the same time, the inspectors need to have enough confidence in the results and in the system itself that they can verify the declared characteristics of the item. The Next Generation Attribute Measurement System (NG-AMS) is an AMS that is intended to make nondestructive measurements on plutonium items. The NG-AMS determines the plutonium isotopic composition, mass, and age (time of americium separation) of these potentially sensitive items and displays attributes, which have been agreed upon between the two parties as nonsensitive, derived from these measurements. We will describe the system and measurement techniques as well as the design philosophy and concept of operation. We will also present the results of measurements made with plutonium sources to determine the operating characteristics of the system.
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