Beta ray ionization chamber 9-3

Gamma ray

The Ludlum 9-3 ion chamber is a rugged air ionization chamber for performing beta-gamma dose rate measurements over a five-decade span ranging from background to 500 mSv/h (50 R/hr). 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 switch selects Off, x10k, x1k, x100, x10 and x1. Each range has a front-panel mounted calibration control. Other features include an audio output, reset, and zero adjust capabilities. Means are also provided to zero the electrometer leakage current. An adjustable shoulder strap (included) provides a convenient and comfortable mode to carry the instrument during surveys. Features 5 Ranges from Background to 500 mSv/h (50 R/hr) 1000 mg/cm2 Retractable Beta Shield Temperature Compensated Low Battery Warning High Background Zero Capability Proportional Audio Output Adjustable Shoulder Strap Included Specifications Detection Range - 0.002 to 500 mSv/h (0.2 to 50,000 mR/hr) (typical) 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) 31.5 cm2 (4.9 in2) open with optional 79% open screen Chamber Volume - 220 cm3 (13.4 in3) Chamber Construction - Carbon coated acrylic Side Wall - 1000 mg/cm2 aluminum and acrylic Beta Shield - Retractable 1000 mg/cm² phenolic slide BETA FACTOR with the instrument exposed to a depleted uranium slab of 234 mrad/hr: Reading with slide Open: 50 mR/hr Reading with slide Closed: 1.2 mR/hr Beta Factor = 234 ÷ (50 - 1.2) = 4.8 Meter Dial - 0 - 5 mR/hr, BAT TEST