- Compact (6-1/2 in.x 20 in.maximum dimensions)
- Lightweight detector/dewar package 8–10 lb stainless steel shroud 25 lb aluminum shroud ∼12 lb
- 1/4 in. Swagelock fittings for cooling endcap (optional)
- Foam-rubber insulation reduces shock
- External connections for in-situ LN2 refilling
- Military specification electrical connections
- Water resistant
- Available with Be or Al end cap
The ORTEC Pipe Gage Monitor (PGM-1) is designed to monitor fluid/vapor density in nuclear reactor coolant piping. Other applications include activated corrosion products monitoring, activation analysis of sulphur in coal slurry, and stack monitoring. In applications requiring high-resolution gamma-ray spectroscopy, such as reactor coolant pipe monitoring, a high-purity germanium (HPGe) radiation detector may be desirable. However, all germanium radiation detectors require liquid nitrogen (LN2
) cooling to operate. A special dewar (thermos vessel) was designed to fit the compact space requirements.
The reactor coolant pipe is subject to temperatures of up to 650°F within 0.5 inches of the detector window. To ensure adequate cooling protection under this environment, a cooling coil is built into the stainless steel endcap to circulate cold water as required. This small but rugged package is bolted to the coolant pipe via a flange.
The liquid nitrogen is refilled periodically through a separate automated filling system attached to the rear of the housing. The holding time of the LN2
dewar is more than 16 hours. Electrical connections (preamp power, detector, H.V. bias, H.V. cutoff, amplifier output, test pulser input) to and from the detector package are made through a military specification connector. This compact (approximately 20-in.in length and 6-1/2 in.in diameter maximum) rugged radiation detector package can be operated either indoors or outdoors.