Research on Absolute Activity Measurement Methods of 239 Pu

Research on Absolute Activity Measurement Methods of 239 Pu | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Research on Absolute Activity Measurement Methods of 239 Pu Hanjia Hu, Lijun Xu, Mingjie Luo, Wen Xia, Baoji Zhu, Shunhe Yao, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9078311/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract This study establishes a method for absolute ²³⁹Pu activity measurement without radioactive standards. Using a triple-PMT liquid scintillation counter, true alpha events were separated from instrumental background via Pulse Length Index (PLI). Combined with ICP-MS isotopic ratio, absolute quantification of 239 Pu in mixed plutonium solutions was achieved. Optimal sample acidity (0.6–0.8 mol/L HNO 3 ) eliminated adsorption and chemiluminescence interferences. The method demonstrated excellent repeatability (RSD = 0.38%) and stability (0.94% over 7 days). The measured specific activity was 82.78 Bq/g, with combined uncertainty of 1.1% ( k = 2). This work provides a traceable approach for nuclear material accounting. 239Pu absolute activity measurement liquid scintillation counting pulse shape discrimination Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-9078311","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":611001755,"identity":"b6f82206-21f9-4ccd-bb18-c4ae3a69e1fe","order_by":0,"name":"Hanjia Hu","email":"","orcid":"","institution":"China Institute of Atomic Energy","correspondingAuthor":false,"prefix":"","firstName":"Hanjia","middleName":"","lastName":"Hu","suffix":""},{"id":611001757,"identity":"9e4f8226-e0d4-4a9f-95a9-ad147d95263f","order_by":1,"name":"Lijun 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Using a triple-PMT liquid scintillation counter, true alpha events were separated from instrumental background via Pulse Length Index (PLI). Combined with ICP-MS isotopic ratio, absolute quantification of \u003csup\u003e239\u003c/sup\u003ePu in mixed plutonium solutions was achieved. Optimal sample acidity (0.6\u0026ndash;0.8 mol/L HNO\u003csub\u003e3\u003c/sub\u003e) eliminated adsorption and chemiluminescence interferences. The method demonstrated excellent repeatability (RSD\u0026thinsp;=\u0026thinsp;0.38%) and stability (0.94% over 7 days). The measured specific activity was 82.78 Bq/g, with combined uncertainty of 1.1% (\u003cem\u003ek\u003c/em\u003e\u0026thinsp;=\u0026thinsp;2). 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