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1 Institute of Nuclear Chemistry, Johannes Gutenberg-Universität Mainz, Germany

Isolation of lanthanide, titanium, hafnium and other radioisotopes from massive targets (Ta, W, etc.) irradiated with 1 GeV protons. F. Roesch 1 , A.F. Novgorodov 2 , D.V. Filossofov 2 , K.P. Zhernosekov 1 , N.A. Lebedev 2 , G.-J. Beyer 3 and the ISOLDE Collaboration.

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1 Institute of Nuclear Chemistry, Johannes Gutenberg-Universität Mainz, Germany

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  1. Isolation of lanthanide, titanium, hafnium and other radioisotopes from massive targets (Ta, W, etc.) irradiated with 1 GeV protons F. Roesch1, A.F. Novgorodov2, D.V. Filossofov2, K.P. Zhernosekov1, N.A. Lebedev2, G.-J. Beyer3 and the ISOLDE Collaboration 1Institute of Nuclear Chemistry, Johannes Gutenberg-Universität Mainz, Germany 2Joint Institute of Nuclear Research, DLNP, 141980 Dubna, Russia; 3ISOLDE Collaboration

  2. aim • Availability of nca radiolanthanides for basic radiochemical and radiopharmaceutical research • Production of nca radiolanthanides • Separation of nca radiolanthanides programme • define isotopes of interest • coordinate irradiation concepts at CERN (targets,size of targets, irradiation periods etc.)with radiochemical separation (Geneva and Mainz) • management of applacation of isolated radionuclides

  3. networking CERN-Geneva isotope production Transport of irradiated Ta converters JINR Dubna Radiolanthanideexpertise Mainz isotope separation Basel cocktail

  4. ISOLDE targets equipped with UC pellets for radioisotope production and a Tantalum (Ta)-bar for converting the incoming proton beam (E=1.4 GeV) into spallation neutrons bar length of 150 mm, Ø 10 mm, mass 195 g received a total dose of 2.5·1018 protons of 1.4 GeV to assess activity and contamination levels, target dismounted bar deformed by the deposited heat and shockwaves of the proton beams strong deformation leads to the expectation of considerable inhomogeneity in activation Ta converters after irradiation

  5. Radiochemical separation I: Ta /*Ln • [ separate nca. radiolanthanides from 195 g Ta ] • dissolution of tantalum target in HF(conc) + HNO3 solution • dissolution process: 2 days • isolation of the nca radiolanthanide *LnF3 fraction: by adding fine-dispersed charcoal • filtration of the charcoal / *Ln fraction

  6. Radiochemical separation II: *Ln separation • [ separate nca. radiolanthanides from each other: baseline ] • desorption of *Ln from charcoal using B(OH)3 • purification (cyclic) of the nca *Ln fraction: 1. precipitation as hydroxides *Ln(OH)3 • 2. centrifugation • 3. dissolution in < 0.1 ml 1 M HCl • 4. + 5 ml H2O + NH3 etc. • transfer to cation exchange chromatography (AG6 / a-HIB)

  7. individual nca radiolanthanides available: Ce - Eu Isotope T1/2 activity (MBq) Ce-139 137.6 d 19.7 Pm-143 265 d 189 Pm-144 363 d 4.7 Pm-146 5.53 a 0.26 Sm-145 340 d 109 Eu-147 24.1 d 0.3 Eu-148 54.5 d 9.7 Eu-149 93.1 d 0.7

  8. individual nca radiolanthanides available: Gd - Yb Isotope T1/2 activity (MBq) Gd-146 48.27 d 35 Gd-151 124 d 187 Gd-153 241.6 d 221 Tb-160 72.3 d 0.03 Dy-159 144.4 d 100 Tm-168 93.1 d 4 Yb-169 32.03 a 4

  9. individual nca radiolanthanides available: Lu Isotope T1/2 activity (MBq) Lu-173 1.37 a 133 Lu-174 3.31 a 6

  10. individual nca radiolanthanides available: Lu Isotope T1/2 activity (MBq) Lu-173 1.37 a 133 Lu-174 3.31 a 6 Lu-172 6 d  50 via a 172Hf / 172Lu radionuclide generator +

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