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dc.contributor.authorLoman AC
dc.contributor.authorter Kuile CR
dc.contributor.authorSlaper H
dc.date.accessioned2012-12-12T17:56:05Z
dc.date.available2012-12-12T17:56:05Z
dc.date.issued1990-09-30
dc.identifier249000001
dc.identifier.urihttp://hdl.handle.net/10029/258977
dc.description.abstractIn-situ gamma spectrometry can be used to determine the qualitative and quantitative deposition of radioactive materials on the ground surface. By applying the in-situ spectrometry method using either a helicopter or an airplane, large areas can be scanned in a short period of time. In this report the results of in-situ gamma spectroscopic measurements taken from a helicopter are described. Measurements were carried out using a single point source, a field of 36 point sources, and using the present ground contamination due to the fall-out from the Chernobyl accident and atom bombs. The results of these measurements were used to determine calibration factors, which were in agreement with a calibration obtained using more simple (and less expensive) laboratory measurements in combination with flux calculations. Detection limits for the measurement of surface contamination were determined. At a height of 50 meters above the surface and using a measurement time of two minutes, the minimally detectable surface contamination was 1.1 kGqm -2 for a Cs-137 contamination and 2.1 kBqm-2 for an I-131 contamination. Fall- out determinations based on measurements taken at a height of 50 meters were in agreement with determinations taken at a height of one meter, and with the results obtained measuring soil samples. The in-situ gamma spectroscopy, using either a helicopter or an airplane, is a fast and powerful method for mapping surface contamination.<br>
dc.description.sponsorshipDGM/S
dc.format.extent80 p
dc.language.isonl
dc.publisherRijksinstituut voor Volksgezondheid en Milieu RIVM
dc.relation.ispartofRIVM Rapport 249000001
dc.relation.urlhttp://www.rivm.nl/bibliotheek/rapporten/249000001.html
dc.subject16nl
dc.subjectbodembesmettingnl
dc.subjectbodembesmetting met radioactiviteitnl
dc.subjectin-situ gammaspectrometrienl
dc.subjectkernongevallennl
dc.titleHet meten van radioactieve bodembesmettingen vanuit de lucht. Gebruik van de in-situ gammaspectrometriemethodenl
dc.title.alternativeThe determination of grand surface radioactive contamination. The application of in-situ gammaspectrometry using a flying helicopter.en
dc.typeReport
dc.date.updated2012-12-12T17:56:06Z
html.description.abstractIn-situ gamma spectrometry can be used to determine the qualitative and quantitative deposition of radioactive materials on the ground surface. By applying the in-situ spectrometry method using either a helicopter or an airplane, large areas can be scanned in a short period of time. In this report the results of in-situ gamma spectroscopic measurements taken from a helicopter are described. Measurements were carried out using a single point source, a field of 36 point sources, and using the present ground contamination due to the fall-out from the Chernobyl accident and atom bombs. The results of these measurements were used to determine calibration factors, which were in agreement with a calibration obtained using more simple (and less expensive) laboratory measurements in combination with flux calculations. Detection limits for the measurement of surface contamination were determined. At a height of 50 meters above the surface and using a measurement time of two minutes, the minimally detectable surface contamination was 1.1 kGqm -2 for a Cs-137 contamination and 2.1 kBqm-2 for an I-131 contamination. Fall- out determinations based on measurements taken at a height of 50 meters were in agreement with determinations taken at a height of one meter, and with the results obtained measuring soil samples. The in-situ gamma spectroscopy, using either a helicopter or an airplane, is a fast and powerful method for mapping surface contamination.&lt;br&gt;


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