防水電離室 SRT-103   Farmer-Type Ionization Chamber (TNC) The chamber is designed for High-precision dosimetry in Radiation therapy Specifications（規格） Volume（體積）  0.02cm3 Response（響應）  2?10-8C/Gy Leakage（漏電流）  ±4?10-15A Polarizing voltage Maximum（極化電壓）  300V Cable length（電纜長度）  20m Wall material  Graphite(C), thickness（室壁厚度）  0.4 mm Protect cap  material（保護帽材料）   PMMA(C5H8O2), Wall density（壁密度）  1.7 gm/cm3(C) Electrode Aluminum（收集極）, 1.0mm ?, 22 mm long Nominal useful range（使用范圍） 30kV to 50 MeV Range of temperature（溫度范圍） 10° to 40 °C Range of relative humidity（相對濕度范圍） 10% to 80%