title: Neutron spectrum at the underground laboratory for the ultra low background experiment.
abstract: We measured the background neutron spectrum using a Bonner sphere spectrometer at the YangYang underground laboratory, where the vertical earth overburden is approximately 700 m. The neutron fluence rate and the energy spectrum were determined through the unfolding procedure. The measured neutron fluence rate was (0.242 ± 0.008) n cm(-2)h(-1) for k=1, and most of the neutrons were below 20 MeV.
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea. hyeonseo@kriss.re.kr
authors.forename: Hyeonseo
authors.initials: H
authors.lastname: Park
authors.forename: Jungho
authors.initials: J
authors.lastname: Kim
authors.forename: Y M
authors.initials: YM
authors.lastname: Hwang
authors.forename: Kil-Oung
authors.initials: KO
authors.lastname: Choi
mesh_terms: D016477:Artifacts; D001417:Background Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007753:Laboratories; D009502:Neutrons; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation*
keywords: Bonner sphere spectrometer; Neutron background; Underground laboratory; Unfolding