Shielded and unshielded geometries in the search for orphan sources

Hjerpe, Thomas; Samuelsson, Christer

doi:10.1016/j.apradiso.2005.11.017

Cited by 5 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When it comes to methods for searching for orphan sources, numerous approaches have been developed. The foundational methodology was introduced by Long and Martin [7] and Hjerpe and Samuelsson [8], introducing the concept of mobile search. These systems rely on systematically sweeping a detector across the search area while monitoring the count rate of a counting window.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a detector system and software tool installed on a mobile laboratory to provide both radiological characterisation of large areas and a simple tool for localising radioactive sources

Rodríguez-Oliver,

Corbacho,

Caballero

2023

J. Radiol. Prot.

View full text Add to dashboard Cite

In emergency situations where an immediate response is required to make appropriate decisions by the competent authorities, it is essential to have measurement tools that provide results as accurate as possible in real-time. This paper presents the description of the upgrade of the mobile laboratory of the Radiological Alert Network of Extremadura, focusing on the characterization of radioactive-contaminated land during emergency situations and the detection of radioactive sources. The detector system is based on two scintillation detectors and a car-borne dose rate monitor. Additionally, a software tool has been developed to collect information from the different devices involved (detectors, GPS, etc.) and display it in an intuitive manner. This system has been tested in an area of a former phosphate facility where soils remain contaminated to varying degrees with radionuclides of TE-NORM origin.

show abstract

Section: Introductionmentioning

confidence: 99%

Design and development of a detector system and software tool installed on a mobile laboratory to provide both radiological characterisation of large areas and a simple tool for localising radioactive sources

Rodríguez-Oliver,

Corbacho,

Caballero

2023

J. Radiol. Prot.

View full text Add to dashboard Cite

show abstract

“…1997, remediation (Giles et.al. 2005), locating point sources (Aage & Korsbech 2003, Hjerpe & Samuelsson 2006, Long & Martin 2007, Kock et.al. 2014, geological mapping for mineral exploration (IAEA 1991, Minty 2011 or epidemiology (Sanderson et.al.…”

Section: Introductionmentioning

confidence: 99%

Operator related attenuation effects in radiometric surveys

Buchanan

Cresswell

Seitz

et al. 2016

Radiation Measurements

View full text Add to dashboard Cite

Radiometric surveys using airborne, vehicular mounted or backpack detector systems are increasingly used to identify and evaluate complex distributions of radioactivity in the environment. The signals detected depend on the energy and spatial distribution of radioactive sources, the material properties of the environment and the specific properties of the detector systems employed. Materials in close vicinity to the detector such as housings, and intermediate materials may have a critical impact on detection efficiency, and must therefore be taken into account in calibration. This study evaluates the effect of shielding by the body of the operator in backpack surveys. Controlled experiments using point sources and absorbers, chosen to represent the form and composition of human tissue, were conducted, and coupled to an analytical radiation transport model to estimate attenuation factors for mapping of 137 Cs. In this way generic factors to correct for this effect using portable spectrometers have been determined. The results compare well with observations at sampled calibration sites in Fukushima and the Solway area in Scotland. Reductions of the 137 Cs fullenergy peak intensity between 20% and 30% may be expected depending on operator stature and the offset position of backpack systems. Similar effects may be present for other radiometric systems carried by a human operator.2 Keywords: Environmental radioactivity, gamma ray survey, attenuation by human operator Highlights:• Evaluation of operator effects on radiometric measurements with backpack systems• Potential for similar effects with other radiometric systems• Count rates for radiocaesium full energy peaks are reduced by 20-30%• Count rates for >450 keV, scaling to dose rate, are reduced by approximately 15%

show abstract

“…In the method above, the source was not shielded. A method devised by Hjerpe and Samuelsson in 2006 [32] used a semi-shielded Cs-137 source. A curve fitting technique was applied using the given regression model.…”

Section: Source Localizationmentioning

confidence: 99%

Source localization using a directional gamma ray spectrometer

Khan¹

View full text Add to dashboard Cite

show abstract

Shielded and unshielded geometries in the search for orphan sources

Cited by 5 publications

References 6 publications

Design and development of a detector system and software tool installed on a mobile laboratory to provide both radiological characterisation of large areas and a simple tool for localising radioactive sources

Design and development of a detector system and software tool installed on a mobile laboratory to provide both radiological characterisation of large areas and a simple tool for localising radioactive sources

Operator related attenuation effects in radiometric surveys

Source localization using a directional gamma ray spectrometer

Contact Info

Product

Resources

About