HEU age determination

Moorthy, A.R.; Kato, W.Y.

doi:10.2172/534522

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“…The HEU age is determined by chemically and quantitatively separating from the dissolved HEU sample the daughter products ^Th and ^Pa in the 234 U and 235 U decay chains as discussed in reference (1) and outlined schematically in Figure 1. Following the separate chemical separation of thorium and protactinium from the enriched uranium, the alpha activity of the ^Th and ^Pa samples was measured with an alpha spectrometer.…”

Section: Introductionmentioning

confidence: 99%

HEU age determination

Moorthy¹,

Kato²

1995

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A technique has been developed to determine the Highly Enriched Uranium (HEU) Age which is defined as the time since the HEU was produced in an enrichment process. The HEU age is determined from the ratios of relevant uranium parents and their daughters viz ^Th/ 23^ and ^Pa/^U.Uranium isotopes are quantitatively measured by their characteristic gammas and their daughters by alpha spectroscopy. In some of the samples where HEU is enriched more than 99%, the only mode of HEU age determination is by the measurement of 251 Pa since there is negligible quantity of ^^Th due to very low atom concentrations of ^U in the sample. In this paper we have presented data and methodology of finding the age of two HEU samples.

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Section: Introductionmentioning

confidence: 99%

HEU age determination

Moorthy¹,

Kato²

1995

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Nuclear Forensic Science: Analysis of Nuclear Material Out of Regulatory Control

Kristo

Gaffney

Marks

et al. 2016

Annu. Rev. Earth Planet. Sci.

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Nuclear forensic science seeks to identify the origin of nuclear materials found outside regulatory control. It is increasingly recognized as an integral part of a robust nuclear security program. This review highlights areas of active, evolving research in nuclear forensics, with a focus on analytical techniques commonly employed in Earth and planetary sciences. Applications of nuclear forensics to uranium ore concentrates (UOCs) are discussed first. UOCs have become an attractive target for nuclear forensic researchers because of the richness in impurities compared to materials produced later in the fuel cycle. The development of chronometric methods for age dating nuclear materials is then discussed, with an emphasis on improvements in accuracy that have been gained from measurements of multiple radioisotopic systems. Finally, papers that report on casework are reviewed, to provide a window into current scientific practice. Ian Hutcheon, our friend, colleague, and mentor, passed away on March 26, 2015, during the writing of this review paper. Ian (PhD, Physics, University of California, Berkeley, 1974)

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HEU age determination

Abstract: Portions of this document may be illegible electronic image products. Images are produced from the best available original document.

Cited by 2 publications

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HEU age determination

HEU age determination

Nuclear Forensic Science: Analysis of Nuclear Material Out of Regulatory Control

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