3B SCIENTIFIC PHYSICS U11391 Instructions D'utilisation page 6

5. Operation
•
Connect the Geiger-Müller box to the digital
input of the 3B NETlog
•
Connect a Geiger-Müller counter tube (not
supplied) to the BNC socket using an HF cable
(U11255) and remove its protective cap.
•
Set up the Geiger-Müller counter tube in the
beam path of a permitted radiation source
226
such as the Ra 3.7 kBq radiation cartridge
U8483115.
•
Start the 3B NETlab
input A.
•
Select the time-scale and the number of data
points.
•
Start the measurement and read off the
number of pulses per unit of time.
•
For low count rates, take note of the
background count.
•
For high count rates, take the lag time of the
counter tube into account.
•
Replace the protective cap on the Geiger-
Müller tube before it is stored.
6. Applications
Measurements of radioactive radiation in the
natural environment and from weak radioactive
sources.
Fig. 1 Experiment set-up for recording decay events in the beam from a radioactive source
TM
unit.
TM
unit and select digital
7. Sample Experiment
Frequency distribution of decay events in the
beam from a radioactive source
Apparatus required:
TM
1 3B NETlog unit
TM
1 3B NETlab program
1 Geiger-Müller box
1 Geiger-Müller counter tube
1 HF cable, 1 m
1 Radiation cartridge,
•
Set up the experiment as shown in Figure 1.
Handle the Geiger-Müller tube and the
radiation cartridge with care.
•
On the 3B NETlab
(template) for the experiment on the frequency
distribution of decay events in the beam from
a radioactive source.
•
Start the application program and record the
decay events.
•
Then count the number of decay events within
a defined time interval (Fig. 2).
•
Repeat the measurement(s) and evaluate the
data.
•
From the results of the measurements, draw
the frequency distribution curve and compare
it with a Poisson or Gaussian distribution.
2
U11300
U11310
U11391
U8533430
U11255
226
Ra, 3.7 kBq U8483115,
TM
unit, open the application