Thermo Scientific RadEye GX Operating Instructions Manual page 78

CR
CR:
CRraw:
DT:
DTc:
The denominator "1- CRraw*DT-CRraw²*DTc" is limited be-
tween 0.15 and 1.
The denominator "CRraw²*(-DTc)" is limited between 0 and 0.8
Overload: The columns "overload" is used for overload detec-
tion. More information can be found in chapter 7.
Area: This field is only valid for measuring unit "Bq/cm²". Sup-
ply this field with the probe area in cm².
Timeout: Here the maximal time between two pulses can be edit-
ed. If no detector pulse within configured time is detected "Detec-
tor error" is triggered.
Active: Here, the active probe can be selected.
Most GM detectors for contamination measurements do not re-
quire individual dead time correction or use of the quadratic term
in order to achieve satisfactory linearity for the default measuring
range of up to 10000 cps (600000 cpm).
On the other hand, GM-detectors used for dose rate measure-
ments may need individual adjustment of these parameters. The
quadratic term of the RadEye GX dead time correction formula
results e.g. in a significantly improved dose rate linearity of the
HP270 probe compared to survey meters using linear dead time
8-14
Pi/Ff 14.09.2016


1 *
CRraw DT
Count rate with dead time correction
Raw count rate without dead time correction
dead time in seconds
dead time coefficient in ns²
DB-074 E
CRraw
 
² ( *
CRraw DTc
RadEye GX, GX-L
)