Thermo Scientific NITON XL3t 500 User Manual page 167

Radiation and General Safety
How to Use the NITON XL3t Analyzer Safely
Figure 3-2. Secondary (Scattered) Beam
The Shutter-Open
When the lights are flashing, the primary beam is on, the shutter is open,
and radiation is being emitted from the front of the analyzer. (This does not
Indicator Lights
include the brief flash of the lights when first turning the analyzer on.)
Thermo Scientific NITON XL3 Analyzer User's Guide 3-7