Calibration of Plutonium NDA by Calorimetric Assay PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The calorimetric assay of plutonium is an established and documented technique used extensively in DOE facilities for accountability measurements. Multilaboratory studies have quantified an average bias of
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The calorimetric assay of plutonium is an established and documented technique used extensively in DOE facilities for accountability measurements. Multilaboratory studies have quantified an average bias of
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Calorimetry provides a method to establish the traceability of the nondestructive assay (NDA) of plutonium utilizing the traceability of calorimetric assay and its relative insensitivity to sample matrix. Efforts at Mound Laboratory to establish the traceability of the calorimetric assay of plutonium are described. Results from the Plutonium Metal Exchange Program and a calibration alternatives experiment are the basis for determining the bias between calorimetric assay and chemical assay. The probable cause of the bias is identified. Current uses of calorimetric assay for NDA measurement control and extension of calorimetry to dynamic calibration of NDA are discussed.
Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
Calorimetry is used as a nondestructive assay technique for determining the power output of heat-producing nuclear materials. Calorimetric assay of plutonium-bearing and tritium items routinely obtains the highest precision and accuracy of all nondestructive assay (NDA) techniques, and the power calibration can be traceable to National Institute of Standards and Technology through certified electrical standards. Because the heat-measurement result is completely independent of material and matrix type, it can be reliably used on any material form or item matrix. The calorimetry measurement is combined with isotopic composition information to determine the correct plutonium content of an item. When an item is unsuitable for neutron or gamma-ray NDA, calorimetric assay is used. Currently, the largest calorimeter capable of measuring plutonium-bearing or tritium items is 36 cm in diameter and 61 cm long. Fabrication of a high-sensitivity large volume calorimeter (LVC) capable of measuring tritium and plutonium-bearing items in 208-1 (55-gal) shipping or storage containers has provided a reliable NDA method to measure many difficult to measure forms of plutonium and tritium more accurately. This large calo rimeter can also be used to make secondary working standards from process material for the calibration of faster NDA assay techniques. The footprint of the calorimeter is 104 cm wide by 157 cm deep and 196 cm high in the closed position. The space for a standard electronics rack is also necessary for the operation of the calo rimeter. The maximum item size that can be measured in the LVC is 62 cm in diameter and 100 cm long. The extensive use of heat-flow calorimeters for safeguards-related measurements at DOE facilities makes it important to extend the capability of calorimetric assay of plutonium and tritium items to larger container sizes. Measurement times, precision, measurement threshold, and position sensitivity of the instrument will be discussed.
Author: Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
Calorimetry is a primary measurement technique for assay of quantities of plutonium in the United States. It is the most accurate NDA technique for many forms of plutonium-bearing materials. This paper provides an overview of the use of calorimetry in combination with high-resolution gamma-ray spectroscopy for accurate plutonium mass determinations.
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Author: American National Standards Institute
Author: American National Standards Institute
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Author: American National Standards Institute
Author: J. W. Stout
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Author: W. W. Rodenburg