[en] The level structure of the neutron rich nuclei ¹⁰⁸Rh and ¹⁰⁹Pd was studied by looking for short lived isomers and investigating the ¹⁰⁹Rh β-decay. Two short-lived γ-transitions of 225.9 keV and 113.4 keV were detected in ¹⁰⁸Rh and ¹⁰⁹Pd with half-lives of 2.5 +- 0.6 μs and 376 +- 30 ns respectively. From the measured intensity ratio of the K X-rays and corresponding γ-lines, αsub(K)-values could be deduced. Furthermore, the level structure of ¹⁰⁹Pd was studied by energy-time- and γ-γ-coincidence measurements of the ¹⁰⁹Rh β-decay. The half-life of the ¹⁰⁹Rh groundstate was determined to be Tsub(1/2) = 82 +- 1 s. No indication of an isomeric state in ¹⁰⁹Rh could be found. The experimental results and the supposed level scheme of ¹⁰⁹Pd are discussed with respect to a rotational description. (orig.)

[en] The sorption of Pd(II) on hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) has been studied at 25 deg C as a function of pH, in 0.01 M NaClO₄, and 0.01 and 0.025 M Ca(ClO₄)₂ aqueous background electrolytes and Pd(II) concentration (9.3 to 47 μM), trying to minimize some types of reactions, such as solid dissolution of and metal precipitation. The radiotracer palladium, ¹⁰⁹Pd, obtained by neutron irradiation, has been used to calculate the palladium's distribution coefficients K_d between aqueous and solid phase. A mathematical treatment of results has been made by ion-exchange theory in order to interpret palladium sorption onto treated solid. For this, we take into account the existence of active sites at the hydroxyapatite surface, and the aqueous solution chemistry of palladium as well as the effect of phosphate anions from solid dissolution. The results can be explained as evidence of sorption of the species PdOH⁺, and of a mixed hydroxo complex of Pd²⁺ like (XCaO^-)-PdOH⁺ x nH₂O fixed onto (≡CaOH) surface sites of the hydroxyapatite. (author)

No abstract available

[en] Experimental details are given of the re-determination of the half-lives of ¹⁰⁹Pd and ¹¹²Pd. The weighted mean half-life for ¹⁰⁹Pd is 13.427 +- 0.014 hours. The half-life for ¹¹²Pd is 21.045 -0.065 +0.029 hours. The value for ¹⁰⁹Pd agrees well with the value of 13.46 +- 0.02 hours adopted in Nuclear Data Sheets, but the value for ¹¹²Pd does not agree well with the value of 20.12 +-0.06 hours adopted in Nuclear Data Sheets. (U.K.)

[en] The distribution of a variety of water soluble ¹⁰⁹Pd and ⁶⁴Cu porphyrins were studied in mice bearing three types of tumors. While the metalloporphyrins are found to have an affinity for neoplastic tissue, substantial extra-tumor concentrations are also noted. Although this limits their value as specific tumor imaging agents, their use in localized therapy is discussed

[en] The half-lives of ^87mSr, ^90mY and ^109mPd have been determined more accurately, as compared to previous measurements. (author) 10 refs.; 3 figs.; 2 tabs

[en] Short communication

[en] Natural palladium on neutron activation provided two radionuclides viz ¹¹¹Ag and ¹⁰⁹Pd with attractive nuclear properties for use in radionuclide therapy applications in nuclear medicine. ¹⁰⁹Pd (t_1/2 13.7h, E_βmax 1.03MeV) was produced by neutron activation of ¹⁰⁸Pd, while in the same target ¹¹¹Ag (t^1/2 7.45d, E_βmax 1.04MeV) is formed by the beta decay of co-produced radioactive ¹¹¹Pd. Measured samples of palladium foils were neutron irradiated in Dhruva reactor for 7d at a flux of 9 x 10¹³ n.cm^-2.s^-1. Radioactive palladium and silver were separated by ion-exchange chromatography over Dowex 1x8, 200-400 mesh size anion exchanger column. Radiochemical mixture of palladium and silver loaded in 10M HCl acid medium showed retention of palladium, while silver eluted out freely. The separated radionuclidically pure fractions of ¹⁰⁹Pd and ¹¹¹Ag activity were reconstituted as chloride and nitrate solutions respectively. About 133 GBq ¹⁰⁹Pd and 930 MBq of ¹¹¹Ag activity were produced from 100mg palladium. (author)

[en] Palladium was seperated from Al, Ru, Rh, U, Pu and also from a mixture of fission products using α-benzoin-oxime as the extractant and Solvesso-100 as the diluent. The extraction is quantitative over a wide range of acidity from 0.1M to 4M HNO₃. The method has been found to be equally effective to separate Pd at trace level (carrier-free form). Tee stoichiometry of the complex, the interference of foreign elements in Pd separation, etc., are reported. The applicability of the method to separate palladium formed in fission rapidly from all other fission products, especially the most strongly interfering molybdenum isotopes, and the recovery of this element from high level radioactive waste are also mentioned. (author) 15 refs.; 2 figs.; 2 tabs

[en] Neutron Activation Analysis (NAA) is a powerful, isotope specific nuclear analytical technique, for simultaneous determination of multi-elements present in diverse matrices at major, minor and trace levels. Depending on the sample matrix and element of interest, NAA technique is used non-destructively or through chemical separation methods. Using high flux nuclear reactor and high resolution gamma ray spectrometry, this technique is capable of analyzing about 2/3rd of the elements (∼ 70 elements) in the periodic table. The elemental concentrations are determined by relative and single comparator (k₀) methods of NAA