We offer a variety replacement probes for our Radiation Alert® instruments.
SE International can help you find just the right probe for your application. Below are the specifications for the most common detectors that we offer.
Custom Probe Options Available. Tell us about your application and we can recommend the best probe options for your needs.
DetectorExternal Halogen-quenched, uncompensated Geiger Muller tube with a thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 45 mm (1.75 in.). Radiation symbol on probe head label marks the center of the detector Which Detector Works With My Model of EXP?All Ranger EXP Models are RAP-RS2 Probes with BNC. For Previous Model SEI’s Radiation Alert Inspector EXPs:The RAP-RS1 fits the EXP Models (SN#s 27299 and lower) No longer available. |
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Anodized aluminum housing
RAP-RS1 Approx. 8.75 X 1 in. (222 X 25 mm) Dia.: 2.75 in. (70 mm)
RAP-RS2 Approx. 10.7 X 1 in. (272 X 25 mm) Dia : 2.75 in. (70 mm)
RAP-RS1: Amphenol-Tucal
RAP-RS2: BNC
Black foam grip
RAP-RS1: Approx. 11.5 oz. (328 g) w/o cable
RAP-RS2: Approx. 9.6 oz. (272 g) w/o cable
| Indicated Use | Low-level, wide-energy gamma detection | |
|---|---|---|
| Detector Type | NaI(Tl) scintillator, 2.5 cm (1 in) dia. x 2.5 cm (1 in) thick | |
| Efficiency (4π) | 125I | 7% |
| 57Co | 10% | |
| 137Cs | 3% | |
| 60Co | 3% | |
| Energy Range | 20 keV to 1.5 MeV | |
| Sensitivity | Cs-137 Sensitivity at 1 mR/h (662 keV) Approx. ~2,917 CPS/mR/hr, ~175000 CPM/mR/hr |
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| Photomultiplier Tube | 2.86 cm (1.123 in) diameter, magnetically shielded | |
| Operating Voltage | 500 to 1200 V | |
| Temperature Range | -15 to 50 °C (5 to 122 °F) May be certified for -40 to 65 °C (-40 to 150 °F) |
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| Connector | Series “C” | |
| Construction | Aluminum with beige powder coat | |
| Size (D x L) | 5.1 x 18.5 cm (2 x 7.3 in) | |
| Weight | 0.5 kg (1 lb) | |
| Indicated Use | Low-level, wide-energy gamma detection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Detector Type | NaI(Tl) scintillator, 2.5 cm (1 in) dia. x 2.5 cm (1 in) thick | |||||||||
| Efficiency (4π) |
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| Energy Range | 30 keV to 3.0 MeV | |||||||||
| Sensitivity | Cs-137 Sensitivity at 1 mR/h (662 keV) ~9,000 CPS /mR/hr , ~540,000 CPM/mR/hr |
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| Photomultiplier Tube | 2.86 cm (1.123 in) diameter, magnetically shielded | |||||||||
| Operating Voltage | 500 to 1200 V | |||||||||
| Temperature Range | -15 to 50 °C (5 to 122 °F) May be certified for -40 to 65 °C (-40 to 150 °F) |
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| Connector | Series “C” | |||||||||
| Construction | Aluminum with beige powder coat | |||||||||
| Size (D x L) | 6.6 x 27.9 cm (2.6 x 11 in.) | |||||||||
| Weight | 1.04 kg (2.3 lb) | |||||||||
“The Radiation Alert Ranger® is a great value for those looking for a modern Geiger counter. I found that is simple to use yet includes many advanced functions if and when you want them without obstructing the simplicity…”
“I have used the Monitor 4 in courses that I teach radiation safety for close to 8 years. The students love it and affectionately call it the “Batman unit” because of its use in the movie The Dark Knight Rises. It is light-weight, sensitive, and quite often out performs some of the more expensive units from other companies that we use in a lab exercise…”
“NDT Supply has been working with SE International since we started business in 2000. We have found them to be easy to work with, and a very reliable and responsive supplier. Questions and issues are always handled promptly and with a smile…”
“Your Ranger changed how I run my business. It’s accurate, easy to use, and perfect for detecting uranium glass.”
“Great product, even better support. Quick replies, solid calibration—SE International is my go-to.”
“We used SE monitors in Iraq and Afghanistan—sandstorms, snow, even camel licks couldn’t break them. Only mortar fire did. I’ve trusted them ever since.”
