A quantitative and comparative study of radionuclidic and chemical impurities in water samples irradiated in a niobium target with Havar vs. niobium-sputtered Havar as entrance foils

Autor:	S.A. McQuarrie, J.S. Wilson, Miguel A. Avila-Rodriguez
Rok vydání:	2008
Předmět:	Radioisotopes Fluorine Radioisotopes Radiation Materials science Niobium Radiochemistry Refractory metals Water Halide chemistry.chemical_element Mass spectrometry chemistry Impurity Alloys Gamma spectroscopy Irradiation Water Pollutants Chemical FOIL method
Zdroj:	Applied Radiation and Isotopes. 66:1775-1780
ISSN:	0969-8043
DOI:	10.1016/j.apradiso.2008.04.016
Popis:	Enriched and natural abundance water samples were irradiated in a niobium (Nb) chamber target with Havar and Nb-sputtered Havar foils. Irradiations were performed with 17.5MeV protons at currents from 35 to 100microA lasting for 1-2.5h. Radionuclidic and chemical (cationic) impurities were determined via gamma spectroscopy and ICP-MS, respectively. Anionic impurities were evaluated by ion chromatography. Impurities in water samples irradiated with the Havar-Nb foils were much lower than the samples irradiated with an unmodified Havar foil. No significant differences were observed in the impurity levels between samples of H(2)(18)O-enriched and natural abundance water. Radionuclidic impurities were observed to decrease after 3-4 irradiations on a fresh Havar entrance foil, and reached a constant value for subsequent irradiations with the same integrated current. For targets covered with Havar foil, radionuclidic impurities were found to be proportional to the beam-integrated current regardless of the beam power and, unexpectedly, dependant of the beam power when using a Havar-Nb foil.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d4aedd8cee246d1602069a5f95178b6 https://doi.org/10.1016/j.apradiso.2008.04.016 Zobrazit plný text záznamu Full Text from ScienceDirect