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Investigations on landmine detection by BF_3 detector

Nuclear Science and Techniques 2007年第4期18卷 237-241页

作者： D.Rezaei OChBELAGh h.miri hakimabad R.Izadi NAJAFABADI Department of Physics University of Mohaghegh ArdabilyP.O. Box 179ArdebilIran Physics Department Faculty of SciencesFerdowsi University of MashhadMashhadIran

Experiments were carried out to investigate the possible use of neutron backscattering for the detection of polyethylene (PE) sample buried in the soil. In detection of landmine by neutrons, the neutron detector and its shield play an important role. In this paper, the effects of graphite, heavy water, polyethylene and boric acid moderators on the flux of back scattered neutrons were investigated. We have also experimentally verified the effect of BF3 detector shield and obtained good agreement with theory.

关键词：地雷中子源中子反散射 BF3装置重水

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Determination of Natural Radioactivity in Different Regions of Iran and Compared with Global Standards

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Journal of Pharmacy and Pharmacology 2014年第1期2卷 79-86页

作者： Samaneh Babazadeh-Toloti hashem miri-hakimabad Laleh Rafat-Motavalli Physics Department School of Sciences Ferdowsi University of Mashhad Mashhad 91775-1436 lran

Soils are naturally radioactive, because of their mineral content. An effective dose delivered by photon emitted from natural radioactivity in soil (40K, 238U and 232Th and their progenies) was calculated in this work. Calculations were performed using the ORNL (Oak Ridge national laboratory) human phantom and Monte Carlo N-particle transport code MCNP-4C according to ICRP103 recommendations. Optimum dimensions of each source were determined considering the incident photon energy. Then, these dimensions were employed in the MCNP code input for calculation of conversion factors which relate the effective dose rate and activity. The obtained factors of the 238U series, 232Th series and the 40K in soil are 0.383, 0.314 and 0.019 nSv h-1 per Bq kg-1, respectively. These results were compared with other studies and revealed that there is a good agreement exists between two sets of data. The estimation of the effective dose rates and the annual effective dose for the adult population has been derived in different regions of Iran, considering the natural radioactivity distribution in soil samples from these regions. Finally, the obtained results in this study were compared with UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation) 2008 report.

关键词：药剂学药理学药学数学物理学化学

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