ECOTEST SPECTRA MKS-11GN Operating Manual page 9

1.2.2 The photon-ionizing radiation sensitivity of (
scintillation detector is at least 200 (cps)/(µSv/h).
Note. At the request of the user, the sensitivity can be changed to a value
of not less than 450 (cps)/(μSv/h).
The neutron radiation sensitivity while using the LiI(Eu)
scintillation detector is equal to:
- At least 1.2 ± 0.12 (pulse×cm
- At least 0.12 ± 0.012 (pulse×cm
1.2.3 The device features a threshold alarm system with four
independent threshold levels:
- Search threshold level or a sigma-threshold (a threshold level of
pulse count rate from the detector of photon-ionizing radiation);
- Safety threshold level (a threshold level of gamma radiation
DER);
- Neutron threshold level (a threshold level of count rate from the
neutron detector);
- Accumulated dose threshold level (a threshold level of photon-
ionizing DE).
1.2.4 The search threshold level is calculated automatically by
the device in the mode of calibration by the gamma background
intensity level and consists of the background counting rate and the
preset number of rms deviations of background counting rate.
Calibration time by the level of gamma background intensity ranges
from 2 to 90 s.
The adjustable range of the number of rms deviations is from 1 to
9.9. Programming resolution – 0.1. The device notifies on exceeding
of the search threshold level with light (red), vibration, or sound
signals "Sigma threshold exceeding". Any combination of alarms
is possible, while at least one type must remain. On the screen of the
device appears a corresponding icon that duplicates the alarm.
2
)/n for thermal neutrons;
2
)/n for fast neutrons.
8
137
Cs) CsI(Tl)