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- W204351215 abstract "Precise measurements of an attribute of the special nuclear material (SNM) in a shipping container can confirm that the SNM was not tampered with during shipping. These measurements do not require a calibration, but they should be based on an attribute unique to each sample. This report describes a new instrument, based on a vertical stack of low-resolution detectors, designed to record such a unique attribute: gamma-rays at 185.7 keV, 1001 keV, and 2614 keV. It collects data for 200 s from sealed shipping containers (208-L barrels). These measurements distinguish the issue of material control (has any material been diverted ) from the issue of measurement control (is there a bias between the shipper's and the receiver's measurements of the same item ). This is an important distinction because material control problems require prompt corrective measures, while measurement control problems are never solved (they just get smaller). This instrument satisfies the regulatory requirements for material control in shipper-receiver transfers. In-plant measurement data are presented to illustrate the stability of the instrument and its ability to distinguish between similar items. 10 refs., 11 figs., 1 tab." @default.
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- W204351215 date "1990-07-01" @default.
- W204351215 modified "2023-09-26" @default.
- W204351215 title "An HEU (highly enriched uranium) confirmatory measurement instrument" @default.
- W204351215 hasPublicationYear "1990" @default.
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