Date: November 27, 1996 (Rev. 12/13/2001)
Editor: N. Gmür, W. Thomlinson
A Chipmunk is a radiation monitor which determines local dose due to gamma and neutron radiation.
Chipmunks are placed in locations around Building 725, 729 and 820 where it is deemed advisable to monitor short and long term radiation trends and patterns. This includes areas around the NSLS Linac, booster ring, VUV and X-ray rings, beamline front ends, and certain 2nd floor offices; around the SDL accelerator; the ATF Experimental Hall, gun hutch and laser rooms. The output of the Chipmunks currently in place is accumulated in history files and analyzed as needed. Their alarms are also used to warn people in their vicinity that radiation levels are elevated.
Each Chipmunk has an analogue dial on the front indicating dose in millirems per hour. A series of three colored lights are associated with three dose ranges:
<1.0 - 2.5
2.5 - 20
Note: above 40 mRem/Hr. the chipmunk alarm will sound continuously. Due to time-averaging, the chipmunk alarm lasts longer than the actual radiation event itself.
(Please ignore “Occupancy in Hrs./Day” on the chipmunk shown above left)
What to Do if a Chipmunk Gives Off an Alarm in Your Area?
Under normal conditions Chipmunks will give off occasional chirps and show a green light under background radiation conditions. If the rate of chirps increases and you see that either the yellow or red light is illuminated, do the following:
Call the NSLS Safety Officer, x5431.