In the mode «SEARCH» the calculation of particles detected with the gamma-
detector and the beta-detector is carried out and the total number of impulses, calculated
during the measurement period appears on the display. The «SEARCH» profile allows you
to locate the source of radiation according to the change of the detected particles fre-
quency and the indications on the display. The «SEARCH» has the twice smaller evalua-
tion cycle than the «MEASURE».
In the mode «MENU» you can set the mode «MEASURE» or «SEARCH», select
one of two variants of these modes, set the alarm threshold value, carry out the
background evaluation, to turn on the audio alarm or vibra signal, to set the calibration
coefficients for the gamma- and beta-detectors. All individual settings made in the menu
get saved after switching the product off.
When the function «DOSE» is on, the product accumulates and memorizes the
dose received by one of the two users.
1.3.3.1 The mode «MEASURE»
The simultaneous evaluation of gamma-radiation and flux density of beta particles,
and averaging with the results of previous cycles, the output of the data on the display is
executed in this mode.
The time of measurement cycle depends on the dose and can vary from 21 seconds
to 2 seconds. For the dose values from 0,005 to 100 µSv/h the measurement time is
21 seconds, for the values more than 100 µSv/h the measurement time gradually
decreases and reaches the minimum equal to 2 seconds for the value of 999 µSv/h.
The time of the flux density measurement cycle does not change and equals to
21 seconds.
In the mode «MEASURE» the button
B
(see p.1.3.1.4) performs the function of the
display backlighting turning on. When you press it shortly the backlighting turns on for 2 s.
The backlight allows you to see the measurement results in the twilight and darkness.
Under bright lighting the backlighting effect is invisible.
Note - You should remember that the turning on the backlight greatly reduces the
time of the product continuous one battery operation.
Your product provides two versions of the mode «MEASURE», they are: evaluation
without taking the background into account and evaluation, taking the background into
account
A) In the mode «MEASURE» without the background the dose rate and flux density
evaluation is executed and the results for each type of radiation appear on the display.
The icons of the completed measurement cycles «
» (see art. 1.3.2.2, fields 3, 5)
allow us to visually determine the number of measurement cycles and are very useful for
locating the place and the moment of a fast change in dose or flux density of beta-
radiation, as in this case the icon « » changes into the icon, «
» what is easy to notice. In
this case the measurement starts automatically from the first cycle and there is no averag-
ing of the results with the previous measurement cycles` results. The subsequent data are
averaged according to the accepted method.
::: GAMMA ::::: ::::::::::::
0,12
0,30
■
::: BETA ::::::::::::::::::::::
9
10
●
MENU
OFF
●
11
