Taking a Measurement
The Pb application is designed to open and close the safety shutter of the instrument, exposing the
sample in front of the Pb200i measurement window to x-rays and gamma-rays produced by the sealed
radioisotope source in the instrument. The safety shutter can only be opened by pulling the trigger of the
instrument while the proximity button at the top of snout of the Pb200i is fully depressed against a
surface.
1. To depress the proximity button, place the front of the instrument’s snout flat against the
sample surface. The “Power indicator LED/Proximity button indicator” will turn green when
the proximity button is properly depressed (Fig. 16).
2. Pull the trigger.
Caution: the proximity button must be depressed before pulling the trigger.
When the Pb application is running on the Pb200i and the trigger is pulled with the proximity button
depressed, the shutter will open. The LEDs on the left and right side of the instrument will turn on and
emit red light. The red lights indicate that the shutter is open. If any of the conditions above are not met
during the measurement process, the shutter will close immediately and the red LEDs will shut off. Once
the shutter is open, it will remain open for a maximum of 5 minutes.
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