{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T01:59:36Z","timestamp":1771466376779,"version":"3.50.1"},"reference-count":17,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2021,3,16]],"date-time":"2021-03-16T00:00:00Z","timestamp":1615852800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Imaging"],"abstract":"<jats:p>NEURAP is a dedicated set-up at the Swiss neutron spallation source (SINQ) at the Paul Scherrer Institut (PSI), optionally implemented as a special configuration of the neutron-imaging station NEUTRA. It is one of very few instrumentations available worldwide enabling neutron-imaging of highly radioactive samples to be performed routinely, with special precautions and following a specific procedure. Since the relevant objects are strong \u03b3-sources, dedicated techniques are needed to handle the samples and to perform neutron-imaging despite the radiation background. Dysprosium (Dy)-loaded imaging plates, effectively made sensitive to neutrons only, are employed. Neutrons are captured by Dy during neutron irradiation. Then the imaging plate is erased removing gamma detections. A subsequent relatively long self-exposure by the radiation from the intrinsic neutron-activated Dy within the imaging plate yields the neutron-only radiograph that is finally read out. During more than 20 years of NEURAP operation, images have been obtained for two major applications: (a) highly radioactive SINQ target components were investigated after long-term operation life; and (b) spent fuel rods and their cladding from Swiss nuclear power plants were characterized. Quantitative analysis of the image data demonstrated the accumulation of spallation products in the lead filled \u201cCannelloni\u201d Zircaloy tubes of the SINQ target and the aggregation of hydrogen at specific sites in used fuel pins of power plants and their cladding, respectively. These results continue to help understanding material degradation and optimizing the operational regimes, which might lead to extending the safe lifetimes of these components.<\/jats:p>","DOI":"10.3390\/jimaging7030057","type":"journal-article","created":{"date-parts":[[2021,3,16]],"date-time":"2021-03-16T12:01:02Z","timestamp":1615896062000},"page":"57","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["NEURAP\u2014A Dedicated Neutron-Imaging Facility for Highly Radioactive Samples"],"prefix":"10.3390","volume":"7","author":[{"given":"Eberhard","family":"Lehmann","sequence":"first","affiliation":[{"name":"Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3768-7411","authenticated-orcid":false,"given":"Knud","family":"Thomsen","sequence":"additional","affiliation":[{"name":"Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9315-8787","authenticated-orcid":false,"given":"Markus","family":"Strobl","sequence":"additional","affiliation":[{"name":"Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6481-5191","authenticated-orcid":false,"given":"Pavel","family":"Trtik","sequence":"additional","affiliation":[{"name":"Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]},{"given":"Johannes","family":"Bertsch","sequence":"additional","affiliation":[{"name":"Laboratory for Nuclear Materials, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]},{"given":"Yong","family":"Dai","sequence":"additional","affiliation":[{"name":"Laboratory for Nuclear Materials, Paul Scherrer Institute, 5232 Villigen, Switzerland"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1080\/10589750108953075","article-title":"Properties of the radiography facility NEUTRA at SINQ and its potential for use as European reference facility","volume":"16","author":"Lehmann","year":"2001","journal-title":"Nondestruct. Test. Eval."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"387","DOI":"10.1016\/j.nima.2011.08.022","article-title":"The ICON beamline\u2014A facility for cold neutron imaging at SINQ","volume":"659","author":"Kaestner","year":"2011","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"745","DOI":"10.1016\/j.nima.2003.07.059","article-title":"Non-destructive analysis of nuclear fuel by means of thermal and cold neutrons","volume":"515","author":"Lehmann","year":"2003","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Tremsin, A., Craft, A., Papaioannou, G., Smolinski, A., Boulton, N., Ruddell, M., Littell, B., and Riley, K. (2019). On the possibility to investigate irradiated fuel pins non-destructively by digital neutron radiography with a neutron-sensitive microchannel plate detector with Timepix readout. Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip., 927.","DOI":"10.1016\/j.nima.2019.02.012"},{"key":"ref_5","unstructured":"Seidel, M., Adam, S., Adelmann, A., Baumgarten, C., Bi, Y.J., Doelling, R., Fitze, H., Fuchs, A., Humbel, M., and Grillenberger, J. (2010, January 23\u201328). Production of a 1.3 MW proton beam at PSI. Proceedings of the IPAC\u201910, Kyoto, Japan."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"320","DOI":"10.1016\/j.nima.2005.01.156","article-title":"Dy-IP characterization and its application for experimental neutron radiography tests under realistic conditions","volume":"542","author":"Tamaki","year":"2005","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"5","DOI":"10.1080\/10448630903120387","article-title":"The Swiss spallation neutron source SINQ at Paul Scherrer Institut","volume":"20","author":"Blau","year":"2009","journal-title":"Neutron News"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/j.jnucmat.2005.01.027","article-title":"The second SINQ target irradiation program, STIP-II","volume":"343","author":"Dai","year":"2005","journal-title":"J. Nucl. Mater."},{"key":"ref_9","unstructured":"Lehmann, E.H. (2021, March 12). Status and Progress in Neutron Imaging Detection Systems; IAEA-TECDOC-1935; 2020. ISBN 978-92-0-126620-0. Available online: https:\/\/www-pub.iaea.org\/MTCD\/Publications\/PDF\/TE-1935_web.pdf."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1016\/j.nima.2009.07.077","article-title":"The PSI ultra-cold neutron source","volume":"611","author":"Anghel","year":"2009","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip."},{"key":"ref_11","unstructured":"Sobbia, R., Dementjevs, S., Joray, S., and Wohlmuther, M. (2013, January 12\u201317). Thermo-mechanical investigations of the sinq \u2018cannelloni\u2019 target. Proceedings of the IPAC 2013: 4th International Particle Accelerator Conference, Shanghai, China."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/S0022-3115(01)00544-X","article-title":"Status of the first SINQ irradiation experiment, STIP-I","volume":"296","author":"Dai","year":"2001","journal-title":"J. Nucl. Mater."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1016\/j.jnucmat.2004.07.007","article-title":"The MEGAPIE 1 MW target in support to ADS development: Status of R&D and design","volume":"335","author":"Groeschel","year":"2004","journal-title":"J. Nucl. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Craft, A.E., Chuirazzi, W.C., Gr\u00fcnzweig, C., Morgano, M., and Lehmann, E.H. (2021). Initial development and testing of dysprosium-based scintillators for digital transfer method neutron imaging. Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrometers Detect. Assoc. Equip., 985.","DOI":"10.1016\/j.nima.2020.164669"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1016\/j.jnucmat.2006.05.033","article-title":"Post-irradiation analysis of SINQ target rods by thermal neutron radiography","volume":"356","author":"Vontobel","year":"2006","journal-title":"J. Nucl. Mater."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Trtik, P., and Lehmann, E.H. (2016). Progress in high-resolution neutron imaging at the Paul Scherrer Institut\u2014the neutron microscope project. J. Phys. Conf. Ser., 746.","DOI":"10.1088\/1742-6596\/746\/1\/012004"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Trtik, P., Zubler, R., Gong, W., Grabherr, R., Bertsch, J., and Duarte, L.I. (2020). Sample container for high-resolution neutron imaging of spent nuclear fuel cladding sections. Rev. Sci. Instrum., 91.","DOI":"10.1063\/1.5143226"}],"container-title":["Journal of Imaging"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2313-433X\/7\/3\/57\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:36:30Z","timestamp":1760160990000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2313-433X\/7\/3\/57"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,3,16]]},"references-count":17,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2021,3]]}},"alternative-id":["jimaging7030057"],"URL":"https:\/\/doi.org\/10.3390\/jimaging7030057","relation":{},"ISSN":["2313-433X"],"issn-type":[{"value":"2313-433X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,3,16]]}}}