Radiation Monitors:
Electronic monitors placed throughout the experimental floor (typically over station doors) check levels of high energy gamma, low energy gamma, x-ray and neutron radiation. Monitors are tripped by the detection of levels of radiation that are too high, which automatically shuts down the linac or CESR ring and activates flashing red lights and a banshee alarm.
If you hear a radiation alarm (high pitched wail accompanied by flashing red lights), proceed immediately to the CHESS Op area. If you are working CHESS West, go through the interlock adjacent to the Op area. However, if you are working in CHESS East, do not walk through CHESS West to reach the Op area - go around via the corridor that passes the loading dock and stockrooms to avoid being exposed to any excess radiation.
| Monitor | Rate | Consequence |
| High Energy Gamma alarm | 2 mR/hr | Shuts off linac, red beacon and area |
| Neutron alarm | 2 mR/hr | Shuts of linac, red beacon and area |
| Low Energy Gamma alarm | 2 mR/hr | Local alarm, red beacon and area |
| Low Energy Gamma Integrated | * | Shuts off CESR, CHESS Stops and shutters close |
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The low energy gamma integration circuit is set to trip when a level of 5 mR/hr is reached for 10 seconds. A level of 3 mR/hr is required to activate the integration circuit. Once the integration circuit trips the area status is no longer safe which will dump CESR and CHESS unless the area is secure.
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The trip of any monitor indicates radiation levels above 2 mr are present and will require all personnel to evacuate the area. Personnel may reenter the area once the monitors have been reset.
