2.
Instructions for the three measuring methods
The 3 different measuring methods offer the chance to select the proper measuring
method for each testing purpose. Single impulse determination corresponds to the
customary contamination measuring method used till now and has therefore been
retained. The values according to IMP/s and
µ
Sv/h are converted and stored in this
measuring method.
2.1.
Display IMPULSE
Single impulse count with direct display on LCD and an audible signal is given with
every impulse, which can be switched off by the SOUND key. The measured value
remains in the display after the measuring time. The RUN/STOP key must be
depressed to start a new measurement.
2.2.
Display Imp/m
With this method the counted impulses are immediately converted to one minute.
The display of the one minute mean value is the most important comparative value
in radiation measurement - e.g. the background counts.
The results are displayed only after the measuring time or a better measuring
interval. The measurements are automatically started again after the measuring
interval and the measured value of the last measuring interval remains in the display
until the new measured value from the following measuring interval is available and
loaded to the display. The last 40 measured values are stored, the oldest value under
No. 1 and the last measured value No. 40. Measured value No. 1 is automatically
deleted by measured value No. 41 and the other measured values are shifted so that
measured value No. 41 is stored as No. 40.
With this measuring method a shorter measuring interval should be chosen. The
mean value per minute from all stored measured values can later be retrieved again
by the STORE key. This display has an oblique and a zero /0) after the measured
value.
If, for example, 968 impulses are counted in 10 minutes the value 96.8/m appears in
the display after 10 minutes. If a one minute measuring interval is selected, 10
individual values are displayed and stored after every minute. Depression of the
STORE key after 10 minutes, however, also gives the value 96.8/0.
Long measuring intervals are selected if long measuring times have to be covered.
For a 24 hour interval a measuring value can be stored every day for 40 days - for an
unattended measuring station, for example.
No audible signals are given - only when the adjustable alarm limit is exceeded.
2.3.
Display
µ
Sv/h
This display is intended for dose rate measurements expressed in Sv (sievert). This
involves measurement of GAMMA radiation only, so ALPHA and BETA radiation must
be shielded - i.e. the protective cover must be left on the counter tube during
measurement.
The measured value of intense radiation is displayed in seconds, weak radiation may
take a few minutes. As in the measurement of the one minute mean value, the
measurements are also continued in this measuring method arid each last measured
value is loaded in the display and stored after the measuring interval. The last
measured values are also automatically stored and here too the mean value of the
stored measured values can be retrieved with the STORE key.
OPERATING INSTRUCTIONS
ALPHAiX 3000
JS Friday 22 April 2011 Page 3 of 7