RAP47, RAP200, and RAP640 Scintillation Probes

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 background count rate.

 

RAP47: 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 measurements

RAP200: A 0.25-inch crystal optimizes this for the detection of special nuclear material (SNM) such as U-235, or related isotopes such as Am-241, much like a mini-FIDLER.

RAP640: Superior 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.

Specifications:
Detector: Type-CsI (Tl) crystal (Cesium Iodide Thallium)

Crystal Dimensions:

RAP47- 25.4 mm (1 inch) diameter. x 1.0 mm (.04 inch) thick
RAP200- 25.4 mm (1 inch) x 6.35 mm (.25 inch)
RAP640- 25.4 mm (1 inch) x 25.4 mm (1 inch)
Radiation Detected:

RAP47-gamma, 8 keV to 1 MeV. Typical absorption 100% at 47 keV, 80% at 100 keV
RAP200-gamma, 8 keV to 1 MeV. Typical absorption 97% at 100 keV, 77% at 185 keV
RAP640-gamma, 8 keV to 3 MeV. Typical absorption 70% at 600 keV, 50% at 840 keV

Temperature Range:
-25°C to 40°C (-4°F to 104°F)
Humidity Range:
0 to 90% Relative Humidity.
Operating Voltage:
600-1100 volts.
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.

Weight:

RAP47-Approx. 178 g (6.3 oz.) without cable
RAP200-Approx. 240 g (8.5 oz.) without cable
RAP640-Approx. 290 g (10.25 oz.) without cable
Warranty: One year limited.