The detector available from GeigerCounters.com includes the Model 3007A Traditional Geiger Counter that has been built with the Model 360 External Pancake Probe. The detector has been specifically developed for frisking and contamination detection purposes.
The bottom unit of the Model 3007A functions as a hand-held survey meter that offers three operating ranges reading on a twin scale by approximately 30,000 CPM or 50 mR/hr. Alternative readout is provided in CPS or uSv/hr. A splash proof speaker in the survey meter creates perceptible clicks. This sealed speaker requires a 9-volt battery to operate and can be switched off in case the meter is left on by mistake. This helps in conserving the other D batteries to continue the operation of the meter.
A straight cable with BNC/BNC fittings is integrated in the instrument to link the survey meter to the probe. In spite of a conventional design, the survey meter is a contemporary unit that features advanced transistorized electronics. It has been calibrated as per the industry standards.
The specifications of Model 3007A Survey Meter for Detector are provided in the table below:
| Optional readout |
uSv/hr and CPS |
| Operating ranges |
0 to .5 mR/hr; 0 to 5 mR/hr; 0 to 50 mR/hr; 0 to 300 CPM; 0 to 3000 CPM; 0 to 30000 CPM |
| Linearity |
± 20% |
| Accuracy |
± 20% |
| Warm up time |
None |
| Response time |
5 second time constant |
| Relative humidity Rng |
20% to 95% |
| Temperature range |
- 10 to + 50° C (14° to 122° F) |
| Audio Readout |
Speaker; clicking type headset is optional |
| Visual Readout |
Easy-to-read 2.62" round meter |
| Controls |
4 position selector switch (off; x1; x10; x100); battery check and speaker on/off switch |
| Detector Voltage |
920 V |
| Power |
One 9 V cell for speaker (NEDA 1604-A or equal) |
| Batteries |
2 standard “D” cells (1.5 V) |
| Calibration |
Pre-calibrated at the factory |
| Connectors |
Microphone connection for optional headset; BNC for probe connection |
| Case |
Rugged Aluminum body and cover |
| Dimensions |
4"W x 9"L x 5" H. |
| Weight |
4.5 lbs. including detector |
Finish
|
Polyurethane enamel
|
The Model 360 Pancake Probe has been developed for contamination monitoring purposes. The extended handle allows for frisking surfaces in complex locations without spoiling gloves or hands.
The pancake detector with its proximity to the probe’s front surface provides improved efficiency for Alpha and feeble Betas, and offers ultra sensitivity to Gamma and X-radiation of low energy. The thin mica window with just 1.8 to 2.0 mg/cm² thickness helps in tracing Alpha radiation down to 3.0MeV when near to the window, as well as in detecting Gamma or X-ray radiation greater than 6keV and Beta radiation greater than 35keV.
The specifications of Model 360 Pancake Probe are provided in the table below:
| Background |
~25CPM |
| Radiation detected |
Alpha, Beta, Gamma, X-ray |
| Sensitivity |
Detects alpha as low as 3.0 MeV; beta > 35 keV; and gamma > 6 keV through window |
| Window |
Mica 1.8-2.0 mg/cm² |
| Maximum altitude |
7,500 ft |
| Temperature range |
- 20° to + 55° C (- 4° to + 131° F) |
| Window diameter |
44.5mm (1.75") |
| Detector handle angle |
~25 degrees |
| Detector head diameter |
2 3/8" (6.0cm) 1(2.5cm) |
| Detector handle length |
8 1/2” |
| Detector head thickness |
1" (2.5cm) |
| Detector overall length |
11 1/4"(28.6cm |
| Detector weight |
14 oz. (400g) |
| Distance between window and probe surface |
0.125” (3.2mm) |
| Material of detector housing |
Aluminum |