CM-11 Wall Mounted Alpha/Beta Contamination Monitor

©JRT Associates 2008

• Versatile The dual channel CM11 operates with a large range of sensitive probes
• Easy to use No user controls or adjustments, clear displays and annunciators, direct readout
• Compact Slim profile with suitable fixtures for mounting to a wall, a personnel monitor or the bench

The CM11Wall Mounted Alpha/Beta Contamination Monitor is effective as an add-on device to personnel monitors to increase monitoring throughput rates. This contamination monitor also works well as a monitoring station during temporary work such as plant maintenance. The CM11 is ideal where space is restricted. It is easy to install and to set up, and equally easy to assign to the next application.

The CM11 Wall Mounted Alpha/Beta Contamination Monitor is ideal as a backup boundary monitor; to confirm Personnel Monitor alarms, to pin-point the position of contamination and amount per 100 cm2, to differentiate radon nuisance alarms from others and for use in an emergency or when AC supplies are down. Monitoring applications arise within power and fuel handling sites, also defense establishments, government laboratories and hot labs in hospitals and industry.

The CM11A and CM11E Wall Mounted Alpha/Beta Contamination Monitors carry hangers for the 20, 50, and 100 cm2 scintillation probes and the DP11 gas flow probe. The following types of radiation may be monitored: - α, β, simultaneous - α plus β, - low energy gamma - simultaneous 125I and β.

Typical Applications

• Monitoring clothing in parallel with hand/foot monitors to speed up throughput
• Monitoring items next to an IPM or PCM
• Detection of radon nuisance alarms. - With a DP6 or DP11 probe, to quantify and pinpoint IPM/PCM alarms from diffuse contamination that pancake geigers cannot detect
• As a temporary monitoring station
• A workstation or exit monitor in a small zone
• As a subchangeroom monitor
• As a specialized monitor for low energy γ radiationTo provide monitoring for feet, identity cards, laundry, tools etc. in combination with special probes

Special Performance Features

• Radon recognition algorithm - eliminates nuisance alarms by distinguishing radon alarms from others
• Gas flow and scintillation detectors both use a standard coaxial cable
• Signal processing for smoother displays of changing countrate with better detection of contamination
• Internal power source gives at least 2.5 hours operation without main power
• Operating point can be set by cursor from graphic display of plateau
• Built-in routines; high voltage scan, plateau plot S plus B and S2/B values for probe characterization
• Gas flow rate and pressure are monitored by electronic means
• Passive infra-red proximity sensor, or footswitch (optional), allows hands to be monitored before touching the probe.

QA Features

• A continuous self-test program prevents monitoring of invalid or fault conditions
• The probe can be tested for contamination after each measurement
• Selectable count-averaging times and confidence levels on the alarms
• Data recording possibilities; peak readings for each measurement, setup parameters and HV scan results (using the serial port and an external printer)