FWT “SHADOW” SURVEY METER 4020

Description

The SHADOW is a small, high quality survey meter with a standard 2″ pancake GM detector mounted on the bottom. No external probe is needed to do contamination monitoring. Surveying can be done with only one hand and the instrument is small enough to fit in a lab coat pocket.

The SHADOW has three linear ranges of 500, 5,000, and 50,000 CPM which are chosen by a three position toggle switch. The scale is also calibrated in mR/h for approximate gamma radiation with ranges of 0-0.2, 0-2, and 0-20 mR/h. The beeper is controlled by the power switch, and the meter light is turned on by a momentary push button.

The SHADOW has a unique, “QR” Quick Response feature which eliminates the need for an adjustable time constant. This circuit adjusts the time constant dynamically. When the counting rate increases, the meter will quickly move up scale then slow down as it approaches the true value. The same action occurs if the counting rate decreases: the meter will go down scale quickly then as it nears the true value it will slow down. The feature reduces the statistical meter fluctuations at low counting rates while still responding quickly to significant changes in the counting rate.

The SHADOW automatically checks the battery condition every time the meter is turned on. When first turned on the meter reads the battery condition for a few seconds then the instrument beeps if the battery is OK.

The Shadow is a very useful convenient meter. Anywhere where the potential for contamination exists, there is a need for the Shadow.

Specifications

Mechanical
 Dimensions: 3″ x 6 1/4″ x 1 5/8″ (75mm x 159mm x 40mm)
 Weight: 18 oz. (500 grams)
 Case: Black Anodized Aluminum
 Detector: 2″ Pancake GM Tube

Operational
 Readout: 2 ½” Taut Band Meter
 External Controls: ON-OFF-ON WITH SPKR toggle switch, Range toggle switch X1, X10, X100 (500, 5000, 50000 CPM), Lamp push switch
 Internal Controls: Calibrate adjustments X1, X10, X100
 Radiation Detected: Alpha >3 Mev, beta >45 KeV, gamma > 6 Kev, Xrays
 Range: 0-500, 0-5000, and 0-50000 CPM (Scale also calibrated for approximate gamma dose rates from the side: 0-0.2, 0-2 and 0-20 mR/h)
 Window & Material: 1.5- 2.0 mg/cmE2, Mica
 Battery: 9v
 Battery Life: 500 hours
 “QR” Quick Response Time Constant: Uses fast TC to get close to reading then changes to slow TC.

RANGE	SLOW	FAST
X1	14 Sec	1.3 Sec
X10	3.2 Sec	1.2 Sec
X100	1 Sec	1 Sec

 Approximate Efficiencies: Tc99: 25% Sr90: 45% C14: 12% (based on 4p geometry)
 Beeper: Piezo Electric. Beeps every count with power switch in ON WITH SPKR position, beeps only at turn-on in ON position. Beeps at turn-on if battery is good.

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