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A gas ionization chamber (GIC) has been developed as an alternative to commercial silicon detectors, which suffer from poor energy resolution for heavy ions due to pulse height deficit. The GIC incorporates a 100 nm thick silicon nitride entrance window and a Frisch-grid electrode configuration with a grid inefficiency of ~0.16%, enabling efficient charge collection while minimizing energy-loss straggling. The detector operates with 30 mbar isobutane gas and an active volume of 80 × 80 × 240 mm³, optimized for stopping recoils from medium-energy heavy-ion beams. Beam tests on a 2 MV accelerator show improved mass resolution compared to a PIPS detector. The GIC achieves 1.64 amu for Co-59 and 0.63 amu for Si-28, compared to 7.80 amu and 1.17 amu, respectively, for the PIPS detector. These results suggest the feasibility of direct isotopic discrimination. The GIC is being integrated with a 6 MV tandem accelerator. Heavy-ion beams such as 30 MeV I-127 are expected to improve mass separation and depth profiling capability. This work presents test results obtained at 2 MV accelerator and simulated performance projections for the 6 MV ToF-ERD configuration.
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