LB 134
7. Probes for the LB 134
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1. Switch the LB 134 off.
2. Place the hand probe with the counter tube facing up onto a
solid, clean support.
3. Open both snap locks.
4. Carefully lift off the counter tube.
5. Pull the connector from the hood at the respective flap.
6. Slip on connector of new counter tube, check if it is properly
seated; insert nose of plug into groove of socket!
7. Carefully install counter tube; do not twist or jam the coun-
ter tube cable.
8. Close snap locks without force.
After power on, the LB 134 microprocessor identifies the
connected probe and sets its program and all calibration
factors, alarm thresholds, etc. accordingly.
Caution! Never open a snap lock before you have placed
the instrument on a firm support! Otherwise, the counter
tube may fall down and/or rupture the counter tube cable.
7.4 Dose Rate Probe LB 1236-H10
The probe LB 1236-H10 with energy compensated proportional
counter tube (50 nSv/h
– 10 mSv/h) is available for gamma
dose rate measurements with external probe.
It consists of a preamplifier/HV generator in a cylindrical case,
which also serves as a handle, and the firmly installed counter
tube. For dose rate measurements we are interested in the ef-
fect of radiation, i.e. the ambient equivalent dose rate and not
the number of counts. Accordingly, these counter tubes are
equipped with a sophisticated energy filter system (consisting of
different materials). The exactly calculated construction of the
energy compensation filter system ensures that the count rates
triggered in the proportional counter tube are largely independ-
ent of the energy of the gamma radiation. The unit of the ambi-
ent dose equivalent rate is μSv/h. The unit of the ambient dose
equivalent (integrated dose rat
e) is μSv (in USA usually mrem).
The highest sensitivity of these counter tubes is perpendicular
to the longitudinal axis. The center of the active area is marked
by a blue ring on the probe case. Due to this quench, the coun-
ter tube should always be held vertical or transverse to the ra-
diation incident direction.
Summary of Contents for LB 134
Page 2: ......
Page 6: ...LB 134 Content IV...
Page 8: ...LB 134 Working with the User s Manual VI...
Page 10: ...LB 134 Safety Instructions VIII...
Page 34: ...LB 134 2 System Description 24 Figure 2 9 LB 134 with wall bracket...
