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Preparation, quality control and biodistribution studies of 165Dy-chitosan for radiosynovectomy

Shirvani-Arani S., Mahmoodabadi A., Bahrami-Samani A., Jalilian A. R., Mazidi M., Afarideh H., Ghannadi-Maragheh M.

Nukleonika

2011

Vol. 56, No. 4

277-282

The preparation of 165Dy-labeled chitosan for radiosynovectomy applications is described in this paper. 165Dy (T1/2 = 2.33 h) was prepared by irradiation of natural Dy(NO3)3 at a flux of 3.4 x 1013 neutrons/cm2.s for about 6 h. The irradiation resulted in the production of 11.1 GBq (300 mCi) of 165Dy activity. Emitting gamma ray (94.7 keV) and beta particles (Emax = 1.3 MeV, 83%) 165Dy decays to 165Ho. Eight hours after bombardment, the corresponding specific activity was 703 MBq/mg (19 mCi/mg). The irradiated target was dissolved in 0.1 N HCl solution. Radionuclidic purity was ascertained by high resolution gamma spectrometry. Chitosan solution was prepared in acetic acid solution (pH 3). The chitosan solution was labeled with 165Dy to prepare 165Dy-chitosan (165Dy-Chit) complex (labeling yield, greater than 99% and specific activity small tilde 3.7 TBq/mmol). In optimized conditions (pH 3, 35 mg/4 ml chitosan acidic solution, and 370 MBq of 165Dy) Chit was stable after 48 h. Bioevaluation of the prepared 165Dy-Chit was carried out by injecting 37 MBq (1 mCi, 50.100 mi1) directly into the knee joints of wild rats. Free 165Dy cation was also injected to study the effect of complex formation on the retention of radionuclide in the administered site. To study the consequence of radioactivity leakage from the administration site, a dilute sample of the complex was injected intravenously into the rats followed by biodistribution studies. It was observed that there was no significant extra-articular leakage of the injected activity over the study period of 24 h post-injection.

Production of [18F] fluoride with a high-current two layer spherical gold target

Mirzaii M., Afarideh H., Hadji-Saeid S., Aslani G., Ensaf M.

Nukleonika

2004

Vol. 49, nr 1

23--27

A new automated target for high yield production of aqueous [18F] fluoride at high beam currents has been constructed for a cyclotron at NRCAM in Karaj (Cyclone 30). It consists of one small golden sphere inside another target chamber, mounted into a special holder, which provides rapid cooling by water flow around and inside the sphere. The target is irradiated with 28 MeV protons. The incident energy on the target chamber is 18 MeV. This target is operated without external overpressure and has been tested for beam currents up to 60 ěA. The measured target yield is 80% of the theoretically calculated yield of 18F, which is used for the synthesis of [18F] 2-fluoro-2-deoxy-D-glucose.