The Radalert 100 is a general purpose geiger counter that measures alpha, beta, gamma, and x-radiation. Exciting new features of the Radalert 100 — as an upgraded version of the popular Radalert 50 — include a three-second update and a utility menu that allows you to change the default settings for several operating parameters. Its digital liquid crystal display (LCD) shows the current radiation level in your choice of milliroentgens per hour from .001 to 110 or counts per minute (cpm) from 0 to 350,000. When SI units are selected, the LCD shows readings in microsieverts per hour from .01 to 1100 or counts per second (cps) from 0 to 3,500. This instrument also offers an accumulated total and timer function, up to 9,999,000 counts and 40 hours. A red LED blinks and a beeper chirps with each count (the chirp can be muted). An audible alert sounds when the radiation reaches a user-adjustable level. The Radalert 100 meets CE certification requirements for Europe.
Use the Radalert 100™ to:
Monitor personal radiation exposure
Monitor an area or perimeter
Detect radiation leaks and contamination
Ensure regulatory compliance
Monitor changes in background radiation
Demonstrate principles of nuclear physics
Check for radioactive minerals in the earth
Specifications:
Sensor: • Halogen-quenched Geiger-Meuller detector (LND712) • Mica end window density is 1.5-2.0 mg/cm² • Side wall is 0.012" #446 stainless steel • Detects Alpha, Beta, Gamma, and X-radiation
Display: 4-digit liquid crystal display with mode indicators
Alert: User-adjustable alert level to 50 mR/hr & 160,000 CPM
Count light: Red LED flashes with each count
Audio: Beeper chirps for each count (can be muted)
Ports: • Output: Stereo 3.5 mm jack sends counts to computers, data loggers, other CMOS-compatible devices, and headphones • Input: Mono 2.5 mm jack provides electronic calibration input
Power: One 9-volt alkaline battery; average battery life is 2160 hours at normal background, 625 hours at 1 mR/hr with beeper off
Size: 150 x 80 x 30 mm (5.9" x 3.2" x 1.2")
Weight: 225 grams (8 oz) including battery
Options: Computer cable and software (IBM PC compatible)
CE Certified
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A red LED blinks and a beeper chirps with each radiation count. The audio chirp can be turned off.
Unique to the Radalert, and the source of its name, is an audible alert that sounds when the radiation reaches a user-adjustable level. Play this sound file. The picture at right shows that adjustment on the top of the unit, to the right of the screened open window over the Geiger Mueller detector.
The Radalert 100 also can be set for a Total Count (see closeup of panel), which will accumulate the radiation counts over time. This is a useful feature especially for establishing your background radiation. As an example, you can set the unit to Total, and after say 10 minutes, divide the Total Count value by 10 to arrive at your background radiation in CPM.
This unit also has a DataOutput port to record counts on a computer or data logger, as shown in the picture at right. Select the navigation button above or click on this link for more on the on data output, and the optional Software accessories. Also note the Audio Output port for external sound.
The Radalert 50 runs on a single 9 volt alkaline battery (included) which will last up to three months on continuous use at background levels.
The Radalert also comes with a padded vinyl carrying case with belt loop, shown at left.
Select the navigation button above, or click here for detailed Specifications on the Radalert 100.
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Unique to the Radalert, and the source of its name, is an audible alert that sounds when the radiation reaches a user-adjustable level. Play this 
Also note the Audio Output port for external sound.
The Radalert also comes with a padded vinyl carrying case with belt loop, shown at left.