DESCRIPTION: Small Digital Ratemeter with built -in 2” diameter
pancake tube and speaker. Reads out in mR/hr (or counts per minute).
Thin window recessed and protected by sturdy grill. Additionally TBM-
3SR-D has sliding methacrylate beta shield which also acts as additional
protection for thin GM tube window. Instrument will see alpha, beta, and
gamma radiation. Anti saturation circuit will not fall below full scale in
high fields. Tested to100 R/h.
APPLICATION: Its small size, light weight, one hand operation, and large
detector area make this a very useful monitor for surveying bench tops or
checking hands, clothes, and fingertips for almost any radioactive
contamination. Excellent for Fire Department, Ambulance, Police, First
Response, and U.S. Custom Personnel use for surveying people, cars,
luggage, surface of rooms, etc.
- Sensitive to Alpha, Beta & Gamma
- One Hand Operation
- Digital Display
- Built-In Speaker
- Anti Saturation Circuit
- Large 2” Pancake Detector
- Beta Shield/Window Protection
- Radiation Detected: Alpha, beta, gamma, and x-ray
depending upon detector used.
- Digital Display: Large 6 digit LCD Display.
(Optional lighted LCD Display.)
- Ranges: 0.01 to 100.00 mR/hr.
(Optional: 0 to 100,000cpm.)
- Front Panel Switches: Power: On/Off. Battery Test.
- Detector: T-1190 “pancake GM tube”
- Diameter: 2 inches (5cm).
- Window Diameter: 1-3/4 inches (4.5 cm).
- Window Thickness: 1.5 mg/cm2
- Quench Gas: Halogen for long life.
- Background: Typical <50 cpm. Thin Profile of tube
(13mm) gives low background.
- Efficiency: 100% for all Betas and Alphas that have the
energy to penetrate the thin window.
- Gamma sensitivity nominal is 3,500 cpm/mR/h (based
- Physical dimensions: 3” Wide x 5-1/4” Long x 2-1/4" High. Excluding knobs and handle. (7.6 cm x 13.3 cm
x 6 cm)
- Beta Shield: Methacrylate 0.125”, 3.1 mm.
- Calibration: Single master calibration pot as well as
individual cal pots for each range.
- Power: 9 volt “transistor” battery; Eveready 1222, or
- Battery Life: 100 hours in normal operation.
- Handle: Swivel type, polished anodized aluminum.
- (Optional Detachable Handle TBM-3SR(DL) Upon
- Weight: 22 oz. (625 grams).
- Optional: Lighted LCD Display.
- Detachable Handle TBM-3SR-D(DL).
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