Abstract:
:Different numerical strategies in searching for orphan radioactive sources in the environment by means of a mobile detector system have been evaluated. A carborne 3- by 3-inch NaI(Tl) spectrometric system was used with an unshielded 2 GBq 137Cs source as a test source. In this paper, a previous method (MB method), based on a moving average algorithm applied on the gross count rate, was extended and compared with three moving average algorithm methods involving different natural background subtraction strategies. For each method the distance from the road that an orphan source can be detected with a probability of 50% (the critical distance, CD) when driving by is determined. The CD for a 2 GBq 137Cs source improved from 105 m to 130 m when the interference from 40K was subtracted from the 137Cs spectral window. However, when the contribution of other natural gamma-emitting nuclides also was subtracted, the ability to find the 137Cs source was reduced.
journal_name
Health Physjournal_title
Health physicsauthors
Hjerpe T,Samuelsson Cdoi
10.1097/00004032-200302000-00008keywords:
subject
Has Abstractpub_date
2003-02-01 00:00:00pages
203-11issue
2eissn
0017-9078issn
1538-5159journal_volume
84pub_type
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