The use of difference spectra with a filtered rolling average background in mobile gamma spectrometry measurements

Evaluating airborne and ground based gamma spectrometry methods for detecting particulate radioactivity in the environment: A case study of Irish Sea beaches

“…The introduction of a uniform anthropogenic background has a minimal effect on detection limits for point sources, assuming that a predictable background count rate can be determined and subtracted, for example using a rolling average background (Cresswell & Sanderson 2009 Cs activity, and across point sources of comparable total activity. It can be seen that the width of the signal from the dispersed activity is marginally wider, but the shapes of the two transects would be indistinguishable within measurement uncertainties at either ground clearance.…”

A deviation display method for visualising data in mobile gamma-ray spectrometry

“…(1)(2)(3)(4)(5)) were reset to their background values after each source passage. The background value is simply a value stored immediately before the first source passage.…”

“…(4), rejecting only negative q i,j . Furthermore, as described below, the background approach here is different from that of Cresswell and Sanderson (2009). To make the method detector-independent it is necessary to allow for a fairly large number of background spectra j.…”

“…Often, the Graphical User Interface (GUI) of such a program displays a wide range of user-defined parameters and graphs in real time. From simple parameters like intensity levels of specific radionuclides (Mellander 1998) or Potassium-Stripped Counts (PSC) in a Region of Interest (Hjerpe and Samuelsson 2003) via simple displays like the "waterfall" display (see "rainbow method" in Aage and Korsbech 2003), to more complex filtered displays (Cresswell and Sanderson 2009) and imaging routines (Ziock et al 2003; ). Many methods implemented in such programs have pre-defined alarm levels on different parameters, helping the search crew with indication.…”

Comparison of airborne and terrestrial gamma spectrometry measurements - evaluation of three areas in southern Sweden

“…Cresswell and Sanderson Airborne gamma spectrometry (AGS) is a swift and effective technique when broad geographic regions must be surveyed. Its applications include mineral exploration (Smith, 1985), geological mapping (Zhang et al, 1998), environmental assessment and assessment of uranium mine site rehabilitation (Bollhöfer et al, 2008;Martin et al, 2006), fallout mapping (Mellander, 1998) and radioactive source search (Cresswell and Sanderson, 2009;Ulvsand et al 2003). If the survey area is small, ground based mobile gamma spectrometry can be a good alternative or complement to AGS.…”