Excitation Functions of ⁹³Nb(³He,xn)^{93m,g, 94 m,g, 95m,g}Tc-Processes from Threshold up to 35 MeV: Possibility of Production of ^94mTc in High Radiochemical Purity using a Thermochromatographic Separation Technique

Abstract

H^-particle induced nuclear reaction / Stacked-foil technique / Positron emitter 94m Tc / Excitation function / Thick target yield / Thermochromatography / Production yield and purity SummaryExcitation functions were measured by the stacked-foil technique for 93 Nb( 3 He,xn) 193 · 94 · 95>mE Tc-reactions from threshold up to 35 MeV. Niobium foils of 13 mm diameter and 5 or 10 μπι thickness were irradiated with 3 He-particles of 35 and 25 MeV incident energy. From the measured excitation functions the thick target yields of the product Tc-radionuclides were calculated. The optimum 3 He-particle energy range for the production of 94m Tc was found to be £( 3 He) = 18 10 MeV, with the expected ® 4m Tc-thick target yield of 0.9 mCi (33 ΜΒς)/μΑ1ι. The levels of other technetium isotopes present as impurities were determined experimentally. Furthermore, the optimum conditions for a thermochromatographic separation of technetium from the irradiated niobium target were developed.

Radiochemical Studies of (p,7Be) Reactions on Biologically Relevant Elements in the Proton Energy Range of 50 to 350 MeV

“…[14][15][16], Interacting with protons, transition metals and their compounds give several activation products, which interfere considerably in the y-ray spectrometric investigation of low 7 Be activity, so that a clean radiochemical separation of 7 Be from each of those irradiated samples is mandatory. Some special features of the present work are described below.…”

Production and separation of no-carrier-added 93,94,95Tc from 9Be activated yttrium target

“…Separation of nca 93,94,95,96,99m Tc from bulk natural Mo and Nb targets were also carried out with the help of LLX using TOA diluted in cyclohexane as organic phase in combination with HCl and HNO 3 as aqueous phase [24,25]. Apart from these, thermochromatographic separation technique has also been explored to separate 93,93m,94,94m,95,95m Tc from natural Nb and 92 Mo targets [4,6].…”

Formation of Activation Products in Interactions of Medium Energy Protons with Na, Si, P, S, CI, Ca and Fe

“…We recently investigated the formation of activation products in beam collimator materials of proton radiation therapy facilities [1] and the generation of 7 Be in interactions of intermediate energy protons with light and medium mass elements of biological relevance [2], Now we report on (p,x) cross section data for the formation of 22 24 Na and other medium mass activation products like 44 "> 47 . 48 Sc, 48 V, 48 M Cr, 52 Fe and 55 Co etc.…”