Journal: Radiochimica Acta

Abbreviation

Radiochim. acta

Publisher

De Gruyter

Journal Volumes

ISSN

0033-8230
2193-3405

Description

Filters

2015 - 201912020 - 20232
Reset filters

Search Results

Publications 1 - 3 of 3
  • Radiochemical determination of 129I and 36Cl in MEGAPIE, a proton irradiated lead-bismuth eutectic spallation target
    Item type: Journal Article
    Hammer-Rotzler, Bernadette; Neuhausen, Jörg; Vockenhuber, Christof; et al. (2015)
    Radiochimica Acta
    The concentrations of the long-lived nuclear re-action products129Iand36Clhave been measured in sam-ples from the MEGAPIE liquid metal spallation target.Samples from the bulk target material (lead-bismuth eu-tectic, LBE), from the interface of the metal free surfacewith the cover gas, from LBE/steel interfaces and from no-ble metal absorber foils installed in the cover gas systemwere analysed using Accelerator Mass Spectrometry at theLaboratory of Ion beam Physics at ETH Zürich. The majorpart of129Iand36Clwas found accumulated on the in-terfaces, particularly at the interface of LBE and the steelwalls of the target container, while bulk LBE samples con-tain only a minor fraction of these nuclides. Both nuclideswere also detected on the absorber foils to a certain extent(≪1%of thetotalamount). Thelatter number isnegligibleconcerning the radio-hazard of the irradiated target mate-rial; however it indicates a certain affinity of the absorberfoils for halogens, thus proving the principle of using no-ble metal foils for catching these volatile radionuclides.The total amounts of129Iand36Clinthetargetwerees-timated from the analytical data by averaging within thedifferent groups of samples and summing up these aver-ages over the total target. This estimation could accountforabouthalfoftheamountof129Iand36Clpredictedtobeproduced using nuclear physics modelling codes for bothnuclides. Thesignificanceof the results and the associateduncertainties are discussed.
  • Recovery of no-carrier-added ⁴¹Ca, ⁴⁴Ti, and ²⁶Al from high-energy proton-irradiated vanadium targets
    Item type: Journal Article
    Wilson, Jennifer M.; Mihalcea, Ionut; Veicht, Mario; et al. (2023)
    Radiochimica Acta
    Many useful and needed radionuclides for medicinal, astrophysical, and environmental research are produced naturally in inefficient quantities or not-at-all. In the method described here, rare cosmogenic isotopes were produced via spallation reactions in metallic vanadium and separated without adding any carriers. In the SINQ facility at the Paul Scherrer Institut, the vanadium targets were irradiated for two years with high-energy protons (<= 590 MeV). After a cooling period of eight years, only relatively long-lived radionuclides such as Si-32, Ti-44, Ca-41, and Al-26 remain present. After target dissolution, Si-32 was first separated for a prospective half-life redetermination. The remaining Si-32-free solution was used for extracting Ti-44, Ca-41, and Al-26, three key isotopes which are scientifically interesting for nuclear astrophysics research as well as medical applications. Each separation scheme employed ion-exchange and extraction chromatography; developed and optimized using inactive model solutions analyzed with Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). The irradiated samples were tracked with gamma-ray spectroscopy for gamma-ray emitting impurities. As a result, radiochemically pure sample solutions of Ti-44, Ca-41, and Al-26 were obtained as "ready for use " in different application fields.
  • Radiochemical separation of 26Al and 41Ca from proton-irradiated vanadium targets for cross-section determination by means of AMS
    Item type: Journal Article
    Veicht, Mario; Mihalcea, Ionut; Gautschi, Philip; et al. (2022)
    Radiochimica Acta
    This work exhibits the very first experimentally determined cross sections for 26Al and 41Ca as proton-induced spallation products of metallic vanadium targets. Additionally, the authors describe a radiochemical separation of 26Al and 41Ca from the vanadium matrix and present the theoretically calculated cross-section values as a reference for the experimental ones.
Publications 1 - 3 of 3