9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Monte Carlo simulation of an in-situ gamma-ray detector system used in conjunction with a planned calibration facility

10 Jul 2012, 17:30
IT Building

IT Building

Poster Presentation Track B - Nuclear, Particle and Radiation Physics Poster Session


Mr Alfred Mogotsi Sehone (Stellenbosch University, Military Academy)

Abstract content <br> &nbsp; (Max 300 words)

Following the release of anthropogenic radioactivity into the environment, for example due to nuclear accidents, it is required that the radioactivity levels in soils be measured so that radiation dose to affected groups can be estimated. In this regard in-situ gamma-ray measurements have the advantage that large areas can be mapped by mounting detectors, coupled with GPS technology, on a vehicle. An example of such an in-situ gamma-ray spectrometry system is the Multi Element Detector for Underwater Sediment Activity (MEDUSA) system which makes use of a CsI(Na) scintillator (70 mm diameter and 150 mm length).

This MEDUSA system can used in several measurement geometries. A common geometry used to assess radioactive fall-out is that of a flat bed, i.e. detector suspended above flat ground. One way to calibrate such a detector system for this geometry is to use calibration pads (with well characterized (natural) radioactivity content). An alternative approach which is more economical in terms of space is to use a drum or "castle" constructed from radiometrically well characterized bricks/slabs. For this case, measurements combined with Monte Carlo simulations of the detector in the calibration and application geometry (e.g. flat bed) are required. We report here on initial results from simulations for a calibration facility being planned at iThemba LABS (Cape).

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?


Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?


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Main supervisor (name and email)<br>and his / her institution

Dr. N.M. Jacobs
noel@ma2.sun.ac.za, Stellenbosch University (Military Academy)

Primary author

Mr Alfred Mogotsi Sehone (Stellenbosch University, Military Academy)


Dr Noel Jacobs (Stellenbosch University, Military Academy) Dr Peane Maleka (iThemba Labs (Faure)) Prof. Richard Newman (Stellenbosch University)

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