Experimental study of source of background noise in muon radiography using emulsion film detectors

被引：24
|
作者：
Nishiyama, R. [1 ]
Miyamoto, S. [1 ]
Naganawa, N. [2 ]
机构：
[1] Univ Tokyo, Earthquake Res Inst, Tokyo 113, Japan
[2] Nagoya Univ, Dept Phys, Grad Sch Sci, Nagoya, Aichi 464, Japan
来源：
GEOSCIENTIFIC INSTRUMENTATION METHODS AND DATA SYSTEMS | 2014年 / 3卷 / 01期
关键词：
CLOUD CHAMBER; TEV; VOLCANOS; SPECTRA; SYSTEM; LEVEL;
D O I：
10.5194/gi-3-29-2014
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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.
引用
收藏
页码：29 / 39
页数：11
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