ECOTEST SPECTRA MKS-11GN Operating Manual page 29

IMPORTANT! If DER is over 50 µSv/h, only the alarm by the
safety level would trigger and it would be impossible to recalibrate
the device by sigma-threshold of gamma radiation.
IMPORTANT! The exposure of powerful electromagnetic
radiation on the device may cause false readings and false alarms.
IMPORTANT! For neutron registration, the device uses a
scintillation detector and amplitude analysis to isolate neutron
responses at the existing gamma background. Since the neutron
responses in the detector correspond to quite high energy values of
equivalent photon radiation, high selective sensitivity particularly to
neutron radiation is achieved. However, high energy single photons
of cosmic origin can be registered as neutrons, which will make
counts appear on the digital display.
The display of random DER counts or intensity count rate by
the neutron channel for less than 24 seconds without actuation of
the neutron alarm threshold is very common and should not be
considered.
2.3.3.4 The mode that displays intensity histograms by gamma
and neutron channels
To go to the mode of intensity histograms by gamma and neutron
channels, move the device's joystick to the left or to the right
(depending on the current operating mode of the device).
In the left upper corner of the display, you can find "SM" that
shows the current operating mode that you are in.
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