Alpha-Beta Probe

The Radiological Detection System (RDS) Alpha-Beta Probe is used for the measurement of surface contamination survey meter of both alpha and beta radiation. It has dual detection capability, having both a phosphor scintillator and a zinc sulfide PMT. The probe can discriminate between Alpha and Beta simultaneously. Designed and tested for military ruggedness to meet both military/defense requirements and industrial applications.


Mission Personal Radiation Detection
Detector Type ZnS(Ag) scintillator adhered to thick plastic scintillator
Dose Rate Units Count Rate – cpm, cps | Count Rate/Unit Area – cpm/cm², cps/cm²
Detection Range Alpha range – 3 MeV – 8 MeV | Beta range – 10 keV – 5 Mev
Cross Talk Alpha to Beta (Am-241) < 15% | Beta to Alpha (Sr-90 Y-90) < 1%
Measurement Range 0 to 1.5 Mcpm
Gamma Sensitivity >35 cps per µGy/hr
Ambient Background 10 µR/hr field: Alpha < 3.0 cpm, Beta < 300 cpm
Response Uniformity ±10% from average reading
Beta Efficiency (4π) 5% C-14, 15% Tc-99, 20% Sr-90 Y-90, 20% Ru/Rh-106
Alpha Efficiency (4π) 2% Gd-148, 10% Th-232, 15% Am-241, 10% U-238, 15% Pu-239, 20% Cf-252
Alarms Saved in Base Unit memory, ability to set
Display RDS Base Unit
Power Supplied by RDS Base Unit
Dimensions 11.6″ x 3.7″ x 3.8″
Weight 2.3 lb. (1.1 kg)

Additional information

Alpha-Beta Probe Features:

Military-grade durability

Simultaneous display of alpha and beta

Part of the RDS radiation detecting probe family

Alpha/Beta/Gamma surface contamination measurement

Simple removable protective grate for decontamination

Built-in mesh screen for extra protection

Probe connector cable can be used with any RDS probe

Hot-swapping Smart Probe Technology

Calibration resident on probe (does not require a paired Base Unit)

Complies with ANSI N42.17 using Cs-137 as reference source

Data Exchange Console options

Comfortable, easy-to-use ergonomic design

Robust cable connections

The Alpha-Beta Probe is a smart probe containing a microprocessor and High Voltage circuitry for creating it’s own high voltage. No high voltage is transferred across the interface cable. When the probe is connected to the Base Unit, the display will show the probe’s image and radiation measurements. The Alpha-Beta Probe’s onboard memory stores the probe type and calibration information.