Description
The palmRAD 907 is an easy-to-use, portable radiation meter designed to accurately detect and measure levels of radioactivity for a multitude of health and safety applications. Lightweight and compact in design, it detects and measures alpha, beta, gamma, and X-ray radiation using a 2-inch pancake GM detector with high sensitivity to beta and alpha sources.
The palmRAD 907 is an economical radiation detection solution for non-technical personnel in government, law enforcement, or the private sector. A slide switch on the front panel turns the unit on or off and toggles between audible and silent chirp modes. Another slide switch lets the user reset total counts or display the radiation activity in mR/hr, CPM, CPS, or mSv/hr. The instrument comes with a protective pouch that secures to a user’s belt for convenience in operation or transportation. The palmRAD 907 meets CE certification requirements for Europe.
Key Features
- Detects alpha, beta, gamma, and X-ray radiation with a 2-inch pancake GM detector.
- Display modes: mR/hr, CPM, CPS, mSv/hr, and Total Counts.
- 4-digit liquid crystal display with mode indicators.
- User-adjustable alarm threshold.
- Acquisition timer for timed readings from one minute to 24 hours.
- Loud audible chirp, one chirp per radiation event; can be muted.
- Red LED flashes with each radiation event.
- “Safety first” calibration feature that can eliminate radiation exposure to the calibration technician.
- Economical solution for non-technical personnel; includes a belt-mounted protective pouch.
- Meets CE certification requirements for Europe.
Detector & Performance
The Model 907 is built around a halogen-quenched Geiger-Mueller tube with a 1.75 inch (45 mm) effective diameter. A thin mica window at 1.5 to 2.0 mg/cm2 density admits alpha and beta particles alongside gamma and X-ray photons, so a single 2-inch pancake GM detector covers four radiation types with high sensitivity to beta and alpha sources.
The 4-digit LCD switches between mR/hr, CPM, CPS, mSv/hr, and Total Counts. Display updates every 3 seconds, showing the average for the past 30-second time period at normal levels; the averaging period shortens as the radiation level increases, and the user can select a fast 3-second averaging period. An anti-saturation circuit holds the readout at full scale in fields up to 100 times the maximum reading, so the instrument stays usable when it enters a strong field.
Detection Efficiency by Isotope
| Isotope | Efficiency |
|---|---|
| Sr-90 546 keV, 2.3 MeV max |
Approx. 75% |
| Bi-210 1.2 MeV max |
Approx. 64% |
| Am-241 5.5 MeV |
Approx. 36% |
| C-14 156 keV max |
Approx. 11% |
Efficiency figures are referenced to the isotope energies listed above.
Sensitivity: 3,500 CPM per mR/hr referenced to Cs-137.
Accuracy: ±15%.
