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防水电离室 SRT-103   Farmer-Type Ionization Chamber (TNC) The chamber is designed for High-precision dosimetry in Radiation therapy Specifications（规格） Volume（体积）  0.02cm3 Response（响应）  2∙10-8C/Gy Leakage（漏电流）  ±4∙10-15A Polarizing voltage Maximum（极化电压）  300V Cable length（电缆长度）  20m Wall material  Graphite(C), thickness（室壁厚度）  0.4 mm Protect cap  material（保护帽材料）   PMMA(C5H8O2), Wall density（壁密度）  1.7 gm/cm3(C) Electrode Aluminum（收集极）, 1.0mm Ø, 22 mm long Nominal useful range（使用范围） 30kV to 50 MeV Range of temperature（温度范围） 10° to 40 °C Range of relative humidity（相对湿度范围） 10% to 80%