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Lepy M.-C.,CEA Saclay Nuclear Research Center | Altzitzoglou T.,Institute for Reference Materials and Measurements IRMM | Anagnostakis M.J.,National Technical University of Athens | Arnold D.,Physikalisch - Technische Bundesanstalt | And 22 more authors.
Applied Radiation and Isotopes | Year: 2010

A comparison of the coincidence summing correction methods is presented. Since there are several ways for computing these corrections, each method has advantages and drawbacks that could be compared. This part of the comparison was restricted to point sources. The same experimental spectra, decay scheme and photon emission intensities were used by all the participants. The results were expressed as coincidence summing correction factors for several energies of 152Eu and 134Cs, and three source-to-detector distances. They are presented and discussed. © 2010 Elsevier Ltd.


Fiumi L.,National Research Council Italy | Campopiano A.,National Institute for Occupational Prevention and Safety | Casciardi S.,National Institute for Occupational Prevention and Safety | Ramires D.,National Institute for Occupational Prevention and Safety
Applied Geomatics | Year: 2012

The aim of this multidisciplinary work is to assess the potentiality of remote sensing multispectral infrared visible imaging spectrometer (MIVIS) data classified for mapping asbestos-cement roofing. In order to validate the methodology, measurement were carried out on the ground in order to later verify the results between the processed data and reality. All roofs classified as asbestos-cement were then sampled and analysed by phase contrast optical microscopy and/or scanning electron microscopy. The average classification accuracy obtained corresponds to 89.1%, and the classification accuracy of the test pixels of asbestos-cement is equal to 94.3%. Only 5.7% of pixels were misclassified. Information about the presence of asbestos-cement in the studied area has been also collected. The asbestos-cement surfaces of buildings vary from 100 to 5,000 m 2, totalling to 30,800 m 2, which is approximately 400,400 kg of asbestos surfaces in an area of 5.2 km 2. The integration of these techniques, resulting from both MIVIS data classification and the results provided by laboratory analyses of the roofs samples, in particular from those not detected by processing MIVIS data, allowed the validation and improvement of this method, and the possibility to develop researches specifically aimed at highlighting the state of alteration of asbestos-cement surfaces. Regardless of these encouraging results, further testing in different areas is still needed in order to improve the methodology developed. © Società Italiana di Fotogrammetria e Topografia (SIFET) 2012.


Ceccatelli A.,National Institute for Occupational Prevention and Safety | Campanella F.,National Institute for Occupational Prevention and Safety | Ciofetta G.,IRCCS Paediatric Hospital Bambino Gesu | Marracino F.M.,IRCCS Paediatric Hospital Bambino Gesu | Cannata V.,IRCCS Paediatric Hospital Bambino Gesu
Applied Radiation and Isotopes | Year: 2010

To determine photopeak efficiency for 99mTc of the NaI(Tl) detector used for liquid waste monitoring at the Nuclear Medicine Unit of IRCCS Paediatric Hospital Bambino Gesù in Rome, a specific experimental procedure, with traceability to primary standards, was developed. Working with the Italian National Institute for Occupational Prevention and Safety, two different calibration source geometries were employed and the detector response dependence on geometry was investigated. The large percentage difference (almost 40%) between the two efficiency values obtained showed that geometrical effects cannot be neglected. © 2009 Elsevier Ltd. All rights reserved.


PubMed | National Institute for Occupational Prevention and Safety
Type: Journal Article | Journal: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine | Year: 2010

To determine photopeak efficiency for (99m)Tc of the NaI(Tl) detector used for liquid waste monitoring at the Nuclear Medicine Unit of IRCCS Paediatric Hospital Bambino Ges in Rome, a specific experimental procedure, with traceability to primary standards, was developed. Working with the Italian National Institute for Occupational Prevention and Safety, two different calibration source geometries were employed and the detector response dependence on geometry was investigated. The large percentage difference (almost 40%) between the two efficiency values obtained showed that geometrical effects cannot be neglected.

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