{"id":447807,"date":"2024-10-20T08:53:53","date_gmt":"2024-10-20T08:53:53","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-c1931\/"},"modified":"2024-10-26T16:35:32","modified_gmt":"2024-10-26T16:35:32","slug":"astm-c1931","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-c1931\/","title":{"rendered":"ASTM-C1931"},"content":{"rendered":"

ASTM C1931-23<\/h3>\n

Active Standard: Standard Test Method for Determination of Uranium Isotopic Composition by Gamma-Ray Spectrometry<\/h4>\n
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ASTM C1931<\/h4>\n

Scope<\/strong><\/p>\n

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1.1<\/span> This test method applies to the nondestructive determination of the isotopic abundances of uranium, typically 234<\/sup>U, 235<\/sup>U, 236<\/sup>U, and 238<\/sup>U, in isotopically homogeneous uranium-bearing materials using gamma spectrometry. The material is commonly inside a container and is measured without specimen preparation.<\/p>\n<\/p><\/div>\n

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1.2<\/span> This test method is applicable to items containing sub-gram quantities of uranium to the maximum uranium mass allowed by criticality considerations.<\/p>\n<\/p><\/div>\n

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1.3<\/span> Measurable gamma ray emissions from uranium cover the energy range from below 80\u2009keV to above 1000\u2009keV. K-X-ray emissions from the isotopes of uranium and their daughters are found in the energy region around 100\u2009keV. This test method has been applied to all portions of this energy range.<\/p>\n<\/p><\/div>\n

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1.4<\/span> The isotopic abundance of 236<\/sup>U is usually not directly determined because its low-energy gamma rays are too weak (1<\/span>)<\/span>2<\/span><\/span> to be detected under normal measurement conditions. Isotopic correlation techniques have been used to estimate its relative abundance (2<\/span>)<\/span>.<\/p>\n<\/p><\/div>\n

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1.5<\/span> This test method has been demonstrated in routine use for isotopic amount fraction (atom %) of 235<\/sup>U from 0.2\u2009% to 97\u2009%.<\/p>\n<\/p><\/div>\n

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1.6<\/span> This test method requires decay equilibrium (160\u2009days for 99\u2009%) between 238<\/sup>U and its 24.1\u2009d half-life 234<\/sup>Th daughter. Corrections can be made if the date of chemical separation of the 234<\/sup>Th daughter is known.<\/p>\n<\/p><\/div>\n

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1.7<\/span> The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.<\/p>\n<\/p><\/div>\n

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1.8<\/span> This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.<\/i><\/p>\n<\/p><\/div>\n

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1.9<\/span> This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.<\/i><\/p>\n<\/p><\/div>\n

Keywords<\/strong><\/p>\n

enrichment; gamma-ray spectrometry; isotopics; nondestructive assay; peak ratio; special nuclear material; uranium;<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)<\/p>\n

DOI:<\/strong> 10.1520\/C1931-23<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

C1931-23 Standard Test Method for Determination of Uranium Isotopic Composition by Gamma-Ray Spectrometry<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2023<\/td>\n11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":447816,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[464,2637],"product_tag":[],"class_list":{"0":"post-447807","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-27-120-30","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/447807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/447816"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=447807"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=447807"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=447807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}