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data-ecl-breadcrumb-item="static" aria-current="page"><span>Nuclear reference data, materials and measurements</span></li></ol></nav><div class="ecl-page-header__info"><h1 class="ecl-page-header__title"><span>Nuclear reference data, materials and measurements</span></h1></div><div class="ecl-page-header__description-container"><p class="ecl-page-header__description">Reliable measurements of α, β and γ radiation are of great importance for environmental monitoring, medical treatment and nuclear safeguards. </p></div></div></div> </div> <main class="ecl-u-pb-xl" id="main-content" data-inpage-navigation-source-area="h2.ecl-u-type-heading-2, div.ecl-featured-item__heading"> <div class="ecl-container"> <div class="ecl-row"> <div class="ecl-col-s-12 ewcms-top-sidebar"> <div> <div data-drupal-messages-fallback class="hidden"></div> </div> </div> </div> <div class="ecl-row"> <div class="ecl-col-s-12"> <div id="block-ewcms-theme-main-page-content" data-inpage-navigation-source-area="h2, div.ecl-featured-item__heading" class="ecl-u-mb-l"> <article dir="ltr"> <div> <div class="ecl-u-mb-2xl"> <a id="paragraph_1929"></a> <article class="ecl-featured-item" ><div class="ecl-featured-item__container ecl-featured-item__container--right"><div class="ecl-featured-item__item"><div class="ecl-featured-item__description"><div class="ecl"><p>Reliable measurements of α, β and γ radiation are of great importance for environmental monitoring, medical treatment and nuclear safeguards. The JRC's radionuclide metrology laboratories provide important nuclear decay data such as radionuclide half-lives and particle emission probabilities and energies. Furthermore, the JRC contributes to improved cross-section standards, e.g. for boron-10. The majority of measurements in neutron physics are performed relative to cross-section standards, and it therefore essential that these standards are continuously improved and their underlying physical mechanisms are understood. Such cross-section standards are also important for nuclear medicine, e.g. boron neutron capture therapy.</p><p>The JRC is specialised in accurate radioactivity measurements and develops and improves techniques for measuring the contents of radioactive substances in various materials, from very low to high radioactivity. As a signatory to the Mutual Recognition Arrangement under the auspices of the Comité international des Poids et Mesures (CIPM), the JRC participates and also organises key comparisons for the establishment of international equivalence of radioactivity standards.</p><p>The JRC's work in radionuclide metrology aims at solving problems in primary radioactivity standardisation and measuring and evaluating radioactive decay data of radionuclides of importance in nuclear safety, waste management and decommissioning, and nuclear medicine. Examples include improved α-particle emission probabilities and energies obtained by high-resolution spectrometry, half-lives of γ-ray and X-ray emitting radionuclides and half-lives of extremely long-lived radionuclides by absolute counting, mass spectrometry or underground γ-ray spectrometry.</p><p>For low background measurements, the <a href="https://joint-research-centre.ec.europa.eu/laboratories-and-facilities/underground-laboratory-ultra-low-level-gamma-ray-spectrometry_en" class="ecl-link">JRC operates an underground laboratory</a>. Underground measurements of radioactivity benefit from the reduction of the cosmic ray flux, thereby significantly reducing background signals. For example, the JRC has measured samples from Hiroshima, enabling the refinement of dosimetry models and improving the understanding of radiation effects on humans.</p><p>In the field of neutron standards, the JRC is the only European laboratory capable of providing cross-section data over the complete neutron energy range from a few meV up to about 20 MeV with the required accuracy.</p></div></div></div><div class="ecl-featured-item__item"><div class="ecl-media-container ecl-featured-item__media_container" ><figure class="ecl-media-container__figure"><picture class="ecl-picture ecl-media-container__picture" ><img class="ecl-media-container__media" src="https://joint-research-centre.ec.europa.eu/sites/default/files/styles/oe_theme_medium_no_crop/public/media_avportal_thumbnails/RtASOqgWK9t35TMWz1cPehVCAJc1zChRGWoKpeVscrg.jpg?itok=jAgK2pCZ" alt="Underground laboratory for ultra-low level gamma-ray spectrometry (HADES) at JRC Geel" ></picture><figcaption class="ecl-media-container__caption">Underground laboratory for ultra-low level gamma-ray spectrometry (HADES) at JRC Geel</figcaption></figure></div></div></div></article> </div> </div> </article> </div> <div data-inpage-navigation-source-area="h2"> <div id="block-relatedpfforactivitypagescustom"> <div class="ewcms-page-section ecl-u-mb-2xl ecl-u-bg-neutral-40"> <div class="ecl-container ecl-u-pv-m"> <a id="paragraph_3113"></a> <div class="ecl"><p><strong>To find out more about the JRC's work on similar topics, explore the related JRC portfolios:</strong></p></div> </div> <div class="ecl-container ecl-u-pv-m"> <a id="paragraph_3114"></a> <div id="block-relatedpfforactivitypages" class="ecl-u-mt-l"> <div class="ecl-content-item-block"><div class="ecl-row"><div class="ecl-content-item-block__item contextual-region ecl-u-mb-l ecl-col-12 ecl-col-l-6 last-item-column"><article class="ecl-content-item" ><picture class="ecl-picture ecl-picture--zoom ecl-content-item__picture ecl-content-item__picture--large ecl-content-item__picture--left" data-ecl-picture-link ><img class="ecl-content-item__image" src="https://joint-research-centre.ec.europa.eu/sites/default/files/styles/oe_theme_ratio_3_2_medium/public/2023-01/25.crisis.management_AdobeStock_544745883.jpg?itok=ynWyhPPH" alt="Open air vaccination session in an african village during corona virus pandemic" ></picture><div class="ecl-content-block ecl-content-item__content-block" data-ecl-auto-init="ContentBlock" data-ecl-content-block ><div class="ecl-content-block__title"data-ecl-title-link><a href="/jrc-science-and-knowledge-activities/crisis-management_en" class="ecl-link ecl-link--standalone" >Crisis management</a></div><div class="ecl-content-block__description"><p>Enhanced situational awareness for crisis management.</p></div><div class="ecl-content-block__list-container"></div></div></article></div><div class="ecl-content-item-block__item contextual-region ecl-u-mb-l ecl-col-12 ecl-col-l-6 last-item-column last-item"><article class="ecl-content-item" ><picture class="ecl-picture ecl-picture--zoom ecl-content-item__picture ecl-content-item__picture--large ecl-content-item__picture--left" data-ecl-picture-link ><img class="ecl-content-item__image" src="https://joint-research-centre.ec.europa.eu/sites/default/files/styles/oe_theme_ratio_3_2_medium/public/2023-01/4.safe_.nuclear.technology_AdobeStock_224816354.jpg?itok=XQDTzTST" alt="cooling towers with water steam in morning light, nuclear plant" ></picture><div class="ecl-content-block ecl-content-item__content-block" data-ecl-auto-init="ContentBlock" data-ecl-content-block ><div class="ecl-content-block__title"data-ecl-title-link><a href="/jrc-science-and-knowledge-activities/safe-nuclear-technology_en" class="ecl-link ecl-link--standalone" >Safe nuclear technology</a></div><div class="ecl-content-block__description"><p>Safety of nuclear technology in support to the transition towards climate neutrality.</p></div><div class="ecl-content-block__list-container"></div></div></article></div></div><div class="ecl-u-border-color-neutral ecl-u-border-width-1 ecl-u-border-top"></div><div class="ecl-row"><div class="ecl-content-item-block__button ecl-col-12"><div class="ecl-u-clearfix ecl-u-pv-m"><a href="/jrc-science-and-knowledge-activities/jrc-portfolios-z_en?prefLang=lv&f%5B0%5D=porfolios_portfolios%3A115&f%5B1%5D=porfolios_portfolios%3A152&f%5B2%5D=source_ct_source_ct%3A161" class="ecl-link ecl-link--standalone ecl-link--icon" ><span class="ecl-link__label">See all JRC portfolios</span><svg class="ecl-icon ecl-icon--xs ecl-icon--rotate-180 ecl-link__icon" focusable="false" aria-hidden="true" ><use xlink:href="/themes/contrib/oe_theme/dist/ec/images/icons/sprites/icons.svg#arrow-left"></use></svg></a></div></div></div></div> </div> </div> </div> </div> </div> </div> </div> <div class="ecl-row"> <div class="ecl-col-s-12"> <div> <div id="block-ewcms-theme-socialshare"> <div class="ecl-social-media-share"> 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