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The CsI (Tl) crystal used in Radiation Alert Probes has a higher atomic number, is more rugged, and less hygroscopic than a typical Nal detector.

The improved gamma ray absorption allows a thinner crystal to be used, effectively reducing the



Type-CsI (Tl) crystal (Cesium Iodide Thallium)
RAP47 - 1.0" dia. x .04" thick (25.4 x 1.0mm)
RAP640 - 1.0" dia x 1.0" thick (25.4 x 25.4mm)
Radiation Detected
RAP47 - gamma 8 keV to 1 MeV.
Typical Absorption 100% at 47keV, 80% at 100 keV
RAP640 - gamma 8 keV to 3 MeV.
Typical Absorption 70% at 600 keV, 50% at 840 keV 
Probe Construction
Anodized aluminum housing. Approximate size: length 7-7.5 inches, diameter 1.5 inches. Connectors-Standard MHV. Cable (Optional)-Straight RG59/u, length 3.5 feet.
Temperature Range
-25°C to 40°C (-4°F to 104°F)
Humidity Range
0 to 90% Relative Humidity. 
RAP47-Approx. 178 g (6.3 oz.) without cable
RAP640-Approx. 290 g (10.25 oz.) without cable 
One year limited.


Thin-crystal (1 mm) optimizes sensitivity to low energy gamma radiation while minimizing sensitivity to higher energies. An excellent detector for Iodine-125 and suitable for thyroid uptake measurementsSuperior to a 1 x 1-inch NaI detector, this is a great choice for an all-around gamma and x-ray detector. Optimal energy range of about 20 keV to 2 MeV. Highest efficiency for a broad spectrum of gamma-emitting isotopes.


Cat. NO.Description
SERAP47-00  Probe for Low Energy Gamma
SERAP640-0.Probe for Higher Energy Gamma