X-ray ionization chamber 9-4

Beta rayGamma ray

The Ludlum Model 9-4 is a rugged air ionization chamber for performing beta-gamma dose rate measurements over a five-decade span ranging from 0 to 500 mSv/h (0 to 50,000 mR/hr). The ion chamber automatically compensates for changes in temperature and pressure. The chamber wall (including the instrument case) is 1000 mg/cm2. A 1000 mg/cm2 retractable beta shield allows beta measurement with a 7 mg/cm2 window. The six-position selector switch selects Off, x10k, x1k, x100, x10 and x1. Other controls include an On/Off switch for a meter light, reset and battery test buttons, and a zero adjustment knob. An adjustable shoulder strap (included) provides a convenient and comfortable mode to carry the instrument during surveys. The Model 9-4 is equipped with a serial interface for calibration. An optional calibration kit supplies the necessary interface cable, software, calibration can, pressure pump, and serial-to-USB converter. RF-Immune Version: The Model 9-4RF is a variant that has improved components and shielding to pass RF susceptibility tests at military levels up to 18 GHz. Features 5-Range Ion Chamber Ranges: 0 to 500 mSv/h (0 to 50,000 mR/hr) 1000 mg/cm2 Retractable Beta Shield Automatic Temperature & Pressure Compensation Low-Battery Warning High-Background Zero Capability PC-Controlled Calibration Includes an Adjustable Shoulder Strap Specifications Linearity - Reading within 10% of true value Window - 7 mg/cm2 metalized polyester; with slide open, allows gamma detection to 6 keV Window Area - 40 cm2 (6.2 in2) Chamber Volume - 220 cm3 (13.4 in3) Chamber Construction - Carbon coated acrylic Side Wall - 1000 mg/cm2 aluminum and acrylic