Endress+Hauser gammapilot FTG 671, Operating Instructions Manual

Page: 16 / 64

Activity of the source Hauser radiometric systems operating with the DG 57 rod scintillation counters
utilize the lowest source strengths.
For limit switching, the source strength is calculated such that the dose rate arriving at
the detector is:
•
approx. 0.1
…
1
µ
Sv/h (0.01
…
0.1 mR/h) for DG 57 detector
•
approx. 1.2
…
8
µ
Sv/h (0.12
…
0.8 mR/h) for DG 17 Z detector
•
approx. 0.6
…
4
µ
Sv/h (0.06
…
0.4 mR/h) for DG 27 Z detector.
In this case, the dose rate usually lies below that defining a control area, i.e. 7.5
µ
Sv/h
(0.75 mR/h) or 2.5
µ
Sv/h (0.25 mR/h), which has to be sealed off.
Warning!
•
The actual extent of the control area depends on local regulations (other limits may
apply) and must be determined on the basis of dose rate measurements made on
site on both sides of the measuring system prior to the commissioning of the
equipment.
•
If the front of the source container can be accessed, shielding or other protective
measures must be provided to prevent accidental exposure to the beam!
Gammapilot FTG 671 Chapter 2: Installation
14