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Chapter Eight - Radiation
Safety
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.
Last Update:
2006-09-21
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