The „Results" Panel - SARAD MyRIAM User Manual

MyRIAM
radiation but this additional information may be helpful for subsequent considerations. ROI4
and ROI5 cover the natural Radon/Thoron daughters Po-214 and Po-212.
The „RESULTS" panel
The basic value of each dose calculation is the measured exposure. The exposure will be
determined for alpha and beta radiation separately. Right beside the exposure values, the
dose coefficients and the breathing rate [m³/annum] are stated. The fields contain the values
read from the instrument during data download or, if a binary file was opened, the originally
saved values.
The content of these fields may be replaced by the user to recalculate the dose with different
dose coefficients and breathing rate. After the input of the new values, the button
be pressed. The dose coefficients for inhalation are given by the ICRP68 for each nuclide
while the age depending breathing rates are stated by the EURATOM guidelines as
following:
Age < 1 year
Breathing
1100
rate [m³/a]
The resulting dose values are related to the calculated value of the last completed storage
(integration) interval. Due to the statistical variations (especially at low exposures and short
integration intervals), the true value may be lower or higher than the displayed one. It is
strictly recommended to take a look at the acquired time distribution.
If no LLRD activity has been detected, the fields exposure and dose will contain the 3
detection limits estimated by the Po-218 concentration with a prefaced "<" sign.
This button opens a window to display the time distribution of a measurement. One
data point is assigned to each integration interval. The viewed value can be selected by the
list box below the graphic area. Exposure, dose value, average activity concentration as well
as the total number of counts within the interval can be displayed. To show the 1 error bars
mark the check box "Show Error Bars". The 3 detection limit appears as a grey shaded area
in the background of the diagram.
If the mouse pointer (red line) is moved across the graphic area, the results related to the
selected data point are shown below the graphic. The "Life Time" label gives the percentage
of the valid measurement time. Values below 100% indicate shocks, vibrations etc. during
the sample interval.
In case that the data have been acquired using the operation mode "Filter Analysis", it is not
possible to select the concentration distribution because there is no defined relation to the
pumping time used for the activity collection. The curves for exposure and dose will show a
continuously decreasing error.
Manual_Myriam_EN_10-04-08.doc
1 - 2 years 2 - 7 years
1900 3200
7 - 12 years 12 - 17 years
5640 7300
- 17 -
has to
> 17 years
8100
(c) SARAD GmbH