The CAPRAC Wipe Test/Well Counter is a very sensitive system which uses a NaI detector that can be affected by high background activity or changes in the room background during counting periods. If the CAPRAC is used in a location which might have a high background, an Auxiliary Shield can be used to reduce background levels.
The Auxiliary Shield walls and top are 0.5″ thick. The top lid has a handle for easy removal. The shield fits snugly around the well chamber and can be easily installed or removed.