Fig. 1. Materials characterization of SCD (a) Surface roughness, (b) X-ray diffraction pattern, (c) Photoluminescence spectrum, (d) Raman spectrum

Fig. 2. Structure diagram of SCD detector (a) and the snapshot of fabricated diamond detector in this study (b)

Fig. 3. Electrical characteristics of single crystal diamond detectors (a) I-V characteristics of fabricated detector in this study, (b) I-V characteristics of MICRON detector, (c) C-V characteristics of fabricated detector in this study

Fig. 4. Block diagram of ²³⁸Pu α response spectrum testing system (a) and energy spectrum test results of energy spectrum (b)

Fig. 5. Relationship between the count rate of SCD detector and the γ dose rate(a) Fabricated detector in this study, (b) MICRON detector

Fig. 6. Variation of the count rate of the diamond detector with cumulative dose

Fig. 7. Variation of SCD detector photocurrent with irradiation γ dose rate(a) Fabricated detector in this study, (b) MICRON SCD detector