Kassim, H.A. Akhdar, H.F. Alrumayan, F.M. Hendy, A.M. JACoW Publishing Geneva, Switzerland 978-3-95450-205-9 10.18429/JACoW-Cyclotrons2019-TUP025 English 212-214 TUP025 target cyclotron radiation proton extraction Contribution to a conference proceedings 2020 2020-06 https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP025 http://jacow.org/cyclotrons2019/papers/tup025.pdf This paper reports a method to reduce the beam energy of the CS-30 cyclotron from 26.5 up to 10 MeV using the internal target system in CS-30 cyclotrons for isotopes production. Irradiation of solid targets, in this type of cyclotrons, take place when the target is positioned horizontally inside the cyclotron tank. In its final position, the target plate interrupts the beam from completing its orbit and nuclear reactions take place. Calculations are made to determine the beam energy as a function of radius. Verification of the new method was achieved by producing pure Ga-68 at an energy level of 11.5 MeV.