Sr-90: 1
When the limit value is exceeded, measures have to be tak-
en immediately to avoid the spreading of the contamination
(German Radiation Protection Ordinance § 44).
Moreover, the measured value has to be recorded in this
case.
Integral threshold Measured values are integrated each second during the meas-
urement. For example, the summation of the dose rate (µSv/h)
results in the dose µSv. For contamination probes we can inte-
grate the net values (cps), and then we would get counts. The
value obtained is compared with the integral threshold and an
alarm message is generated when this threshold is exceeded.
Integral unit Here the unit of the integral value is entered as text, e.g. µSv,
mrem, counts or pulses.
Time base During the measurement, the current integral value or the dose
and the integration time elapsed until then is determined every
second through addition. If you have selected the unit counts
per second (cps), you get counts through adding up (counts). If
you have selected the unit µSv/h, as for the dose rate, then the
time base is not seconds but hours. Therefore, before the addi-
tion, the value must be divided by 3600, since every second is
added up. This divisor is selected correctly when entering the
integral calculation time or the time base. You can select s, m
or h.
6.8 Integral Reset
The integral values / dose and the associated integral time are
reset.
Figure 6.15: Resetting the integral values and integral time
To Next Page
Loading...
