Evaluation of gamma and neutron irradiation effects on the properties of mica film capacitors

[摘要] We present an investigation of gamma and neutron radiation effects on mica film capacitors from an electrical point of view. We have studied quantitatively the effects of gamma and neutron irradiation on mica film capacitors of thickness, 20 and 40 𝜇m (0.7874 and 1.5748 mil) with two different areas, 01 and 04 cm². The capacitance has been measured at room temperature in the frequency range 100 Hzâ€�??10 MHz. Negligible change in the capacitance due to high gamma dose of ⁶⁰Co, 15 kGy at dose rate 0.25 kGy/h, has been observed. However, appreciable change in the capacitance has been observed due to low doses of fast neutrons (cumulative dose, 115 cGy) with flux ∼ 9.925 Ã�? 10⁷ neutrons/cm² h from ²⁵²Cf neutron source of fluence, 2.5 Ã�? 10⁷ neutrons/s. We have also observed that the impact of gamma and neutron irradiation is more at frequencies higher than 10 kHz. These results show that the mica capacitors do not show any radiation response below 10 kHz.

[学科分类] 材料工程

[关键词] Mica film capacitors;ionizing radiation;gamma;neutron;radiation damage.