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| Titel |
Experimental study of source of background noise in muon radiography using emulsion film detectors |
| VerfasserIn |
R. Nishiyama, S. Miyamoto, N. Naganawa |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 3, no. 1 ; Nr. 3, no. 1 (2014-04-16), S.29-39 |
| Datensatznummer |
250115210
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| Publikation (Nr.) |
 copernicus.org/gi-3-29-2014.pdf |
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| Zusammenfassung |
| The aim of this study is to ascertain and confirm the source of background
noise in cosmic-ray muon radiography (muography) using emulsion film
detectors. For this, we build two types of emulsion detectors with different
momentum thresholds and perform test measurements of an actual geoscientific
target. This experiment reveals that contamination of nonsignal particles
with momenta of less than 2 GeV c−1 cause significant systematic
errors for the density estimation of muography. Utilizing the results of
precedent studies, we conclude that the origin of these low-momentum
particles is either electromagnetic components of air showers or cosmic-ray
muons scattered in topographic material. In this paper, we analyze the
emulsion data in detail, including the film-inefficiency compensation and
momentum selection by applying an upper bound to the chi-square distribution
for the data. |
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