Model TBM-15D Digital Radiation Frisker

Ideal for Nuclear Medicine

• Light Weight
• Digital, Auto-Ranging
• External Pancake G-M Probe
• One hand operation (Ergonomic Probe Holder)
• Built-in "Sonalert"

This compact digital radiation ratemeter features a separable two inch diameter pancake probe. Standard display units are mR/hr. Other units: µSv/h cpm, or cps are avaiable upon request. Thin probe window is recessed and protected by sturdy stainless steel grill. The instrument will detect alpha, beta and gamma radiation. The anti-saturation circuit will not fall below full scale in high fields. The TBM-15D is tested to 100 R/hr. Sonalert provides audible rate indication.

Application: This nuclear instrument's small size, light weight, separable probe and large window detector area make this a useful monitor for surveying bench tops or checking hands, clothes and fingertips for almost any radioactive contamination

TBM-15D Specifications

Read-out: Rugged 6 digit display.
Ranges: 0.01 to 200 mR/hr, no range switching. (0-500,000 cpm)
Linearity: +/- 15% of full scale with pulse generator.
Battery Test: Push button.
Audio: Sonalert.
Two Time Constants: Fast & Slow (each is user programmable) 0 to 90% of final reading.
Setable: 2 sec to 99 seconds.
Detector:
T-1190 2'' diameter (5cm) ``pancake GM'' tube. Plateaus:  150V <10% / 100V
Window Diameter: 1 3/4''; 4.5 cm. Area 16 cm²
Window Thickness: 1.5 mg/cm<sup>2</sup>.
Quench Gas: Halogen for long life. Deadtime: 70 µ sec Max
Background: Typical 50 cpm. Thin profile of tube (13mm)  gives low background.
Efficiency: 100% for all betas and alphas that have sufficient  energy to penetrate the thin window.
Physical Dimensions: 3''; 7.6 cm wide x 5 1/4'' W; 13.3 cm long x 2 1/4''; 6 cm thick (excluding probe, meter, and handle).
Temperature: -10°c to +50°c when high quality batteries are used.
Calibration: Single master calibration pot as well as programable calibration factor.
Efficency: Beta C-14 > 6%, Sr-90/Y-90> 25%.
Speaker: Built-in Audible Click for detector pulse, on-off Volume switch on panel.
Pulse-count: Green LED.
Alarm: Settable over entire instrument range.
Warning: Red LED.
Optional Serial Port: Allows real time data logging to portable PC.
Power: 6 ``AA'' cells.
Weight:
Electronics only: 22 oz.; 625 gm.
Total: including separable pancake probe 34oz.; 0.97 kg.
Battery Life: 100 hours in normal operation (Greater with Li or NiMH Battery).