In the present study, CR-39 detectors with thickness of 1.0mm are irradiated respectively by C3+(10MeV, 20MeV, 20MeV), O3+(10MeV, 20MeV, 30MeV) particles and protons (5MeV) with ion fluences ranging from 1.0×107cm−2 to 5.0×109cm−2. The etching time conditions of the latent tracks for the different irradiation particles with different fluences described above are experimental studied. The curves for track density distributions with irradiation fluences of different energy particles are simulated. The suggested irradiation fluences ranges for the three types of particles detected with CR-39 detector are offered according to the measurement results.

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