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Six LPGs written by means of Electric Arc Discharge (EAD) technique in standard and speciality fibers, including radiation-hardened ones, were tested. The EAD technique was chosen because it enables the writing of gratings both in standard and not photosensitive fibers. The experiments have been carried out in a \u201cTRIGA\u201d pulsed nuclear reactor and the LPGs were irradiated by a gamma-ray dose-rate of 9\u2009Gy\/s and a mean 1.2\u221910<jats:sup>12<\/jats:sup> n\/(cm<jats:sup>2<\/jats:sup>s) neutron flux. Real time monitoring was performed for a comparative investigation of LPGs\u2019 response, in terms of radiation sensitivity and wavelength shift. Experiments show that LPG in a radiation-resistant fiber exhibits resonant wavelength shift higher than LPG in standard fiber. The changes of temperature sensitivity due to radiation were experimentally established by comparison of pre- and post-radiation characterization, indicating that radiation effects induce a slight increase of the temperature sensitivity, except for the LPG in pure-silica fiber. Theoretical and numerical analysis was combined with experimental data for evaluation LPGs\u2019 parameters changes, such as refractive index and thermo-optic coefficient, after exposure to radiation.<\/jats:p>","DOI":"10.1038\/s41598-017-16225-4","type":"journal-article","created":{"date-parts":[[2017,11,14]],"date-time":"2017-11-14T11:19:44Z","timestamp":1510658384000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Arc-induced Long Period Gratings in standard and speciality optical fibers under mixed neutron-gamma irradiation"],"prefix":"10.1038","volume":"7","author":[{"given":"Andrei","family":"Stanc\u0103lie","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1187-5825","authenticated-orcid":false,"given":"Flavio","family":"Esposito","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajeev","family":"Ranjan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petri\u015for","family":"Bleotu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefania","family":"Campopiano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agostino","family":"Iadicicco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Sporea","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,11,20]]},"reference":[{"key":"16225_CR1","doi-asserted-by":"publisher","first-page":"2015","DOI":"10.1109\/TNS.2012.2235464","volume":"60","author":"S Girard","year":"2013","unstructured":"Girard, S. et al. 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