SARAD MyRIAM User Manual page 11

MyRIAM
For example, choosing an integration interval of one hour results in strongly reduced
detection limits and gives still a good possibility for a chronological (and therefor also local)
assignment of dose contributions.
The immediate alert function (1-Minute basic interval) is not affected by any setting of the
integration interval. The resulting limits for a 60 Minutes integration interval are stated below:
After finishing the observation period (e.g. one month), the inhalation dose for the whole
period can be determined by using the filter analysis mode. Because the pump is not
running, the influence of Radon daughters becomes negligible and the collected activity is
stable over the analysis period.
Channel
Analysis Period
8 hours
12 hours
24 hours
Manual_Myriam_EN_10-04-08.doc
Fig. 2 Detection Limit/Threshold (3) for T
ALPHA
Exposure Dose (Pu-239)
[Bqh/m³]
0,083 0,0036
0,056 0,0024
0,028 0,0012
Tab. 1 Detection Limits (3) for filter analysis mode
= 60 min
i
Exposure
[mSv] [Bqh/m³]
0,083
0,056
0,028
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BETA
Dose (Sr-90)
[mSv]
0,000012
0,000008
0,000004
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