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In recent years, the possibility of direct production of the 99mTc isotope(bypassing the parent 99Mo stage) for medical purposes using nuclear reactionson charged particle beams has been actively discussed around the world [1,2].At A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), anactivity is underway to develop a technology for producing the 99mTc isotope byirradiating a molybdenum target of 100Mo, pressed into a titanium base, with aproton beam of a C18 cyclotron [3,4,5]. One of the limitations of thistechnique is the utilization of heat released in the target as a result ofproton energy loss [6,7]. The task of this work was the improvement of thethermal regime of a standard target for the C18 cyclotron due to a series ofparallel grooves. Heat transfer experiments with prototypes of targets werecarried out on a specially made test bench providing water cooling of its backside. A special Plexiglas thermal block was made to study the thermal processesin the target. The measurement results show that the above mentioned techniqueof processing the base of the target leads to a significant increase in therate of cooling of the target, which will allow to irradiate at significantlyhigher proton beam intensities, which in its turn will increase the irradiationefficiency and reduce the cost of the final product.

Development of cooling system of solid state target for irradiation under proton beam of C18 cyclotron