[en] Carrier-free chromium-51 can be obtained in cyclotron by the nuclear reaction ⁵¹ V (p,n) ⁵¹ Cr using for irradiation natural vanadium (99,75% ⁵¹ V) as target. The chemical separation of chromium from vanadium is carried out by the cationic exchanger, A G 50 W-X 8 (200-400 Mesh), on perchloric acid medium. In comparison with other applied methods, which make use of several coprecipitation followed by an ionic exchanger, this method presents a good separation yield, it is rapid and the apparatus used for it rapid and the apparatus used for it can be easily fitted in a hot cell. (author). 7 refs, 2 figs, 3 tabs

[en] Samples of natural metallic zinc or eletroplated zinc in nickel were irradiated with protons in the Cyclotron CV-28 of the Instituto de Pesquisas Energeticas e Nucleares - CNEN/SP. The chemical treatment was made by dissolution in 10 N HCl and the solution percolated through cationic resin. ⁶⁷Ga was eluted with 3,5 N HCl the solution evaporated to dryness and taken up in 3,8% sodium citrate solution. Radioactive, chemical, radiochemistry impurities were determined. (Author)

[en] Aim: The production of ⁹⁹Mo is one of the steps towards the nationalization of the radioisotope production at IPEN-CNEN/SP. The chosen reaction was the neutron capture on ⁹⁸Mo due to IPEN's IEA-R1m Reactor characteristics and process simplicity. The gel generator technology was studied where ⁹⁹Mo is strongly bonded and ^99mTc can be easily eluted with saline solution. This paper describes the technological stages of this project. Materials and Methods: The following steps are being performed: 1- Choice of target: metallic Mo and MoO₃; 2- Irradiation device; 3- Measurement of the specific activity of ⁹⁹Mo; 4- Types of gel: zirconium molybdate (MoZr) and titanium molybdate (MoTi); 5- Preparation route: Mo irradiation and gel preparation (post-formed) and gel preparation and irradiation (pre-formed); 6- Optimization of the gel chemical reaction variables; 7- Gel characterization; 8- Gel generator preparation: dry and wet techniques; 9- Quality control of the ^99mTc eluted; 10- Gel preparation at laboratory level; 11- Assembling of the hot processing cell; 12- Routine production. Results: The main results are: 1- The chosen target was MoO₃ on a molten form; 2- The best condition for irradiation was inside a Be irradiator assembled at the reactor core; 3- The specific activity of ⁹⁹Mo was 3.7X10¹⁰ Bq / g Mo irradiated at 5 MW for 120 hours; 4- Most of the work was done with Zr, and good preliminary results were obtained with MoTi gel; 5- The route that gives ^99mTc with the best quality is the post-formed, with a higher elution yield and less radionuclidic impurities; 6- A basic procedure was developed in order to optimize the reaction variables for MoZr gel preparation; 7- In house techniques were developed for gel characterization; 8- The dry technique delivered the most uniform generators, with an elution yield higher than 80% in 10-12 mL of saline solution; 9- The quality control tests showed the good quality of ^99mTc eluted from MoZr gel generators; 10- A gel (MoZr) preparation procedure was successfully developed at laboratory level; 11- A hot processing cell is now been assembled for the routine preparation of MoZr gel and gel generators; 12- The routine production of gel type generators at IPEN-CNEN/SP is expected to start in the beginning of the second semester of 2002. Conclusions: A technology for the production of ⁹⁹Mo and preparation of gel type ⁹⁹Mo-^99mTc generators was successfully developed at IPEN-CNEN/SP

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