Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login 
Home Print this page Email this page Small font size Default font size Increase font size Users Online: 171
ORIGINAL ARTICLE
Year : 2017  |  Volume : 40  |  Issue : 3  |  Page : 121-125

Thermal neutrons of the terrestrial origin in the Brazilian region


1 Department of Space Geophysics, Space Research Institute of the n Academy of Sciences (IKI) Moscow, Russia
2 Department of Physics, Technological Institute of Aeronautics (ITA), São José dos Campos, Brazil

Correspondence Address:
Anatoly Alexandrovich Gusev
Department of Space Geophysics, Space Research Institute of the Russian Academy of Sciences, IKI, 84/32, Profsoyuznaya Str, Moscow 117997
Russia
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/rpe.RPE_16_17

Rights and Permissions

Dynamics of near ground concentration of ambient thermal neutrons (TNs) was studied using data of neutron detectors of the COsmic-ray Soil Moisture Observing System (COSMOS) network and those of the Laboratory of environmental radiation of the Instituto Tecnológico de Aeronáutica (Brazil). A significant excess of TN count rate over that of rapid ones was found in two COSMOS probes located in Brazil and other sites in North America and Europe. The effect was explained in terms of neutron production in nuclear (α, n) reactions initiated by decay of radon gas comprised in the ground rather than in the atmosphere. A revealed strongly marked diurnal variation of the TN concentration proved to be in antiphase with air temperature that is characteristic for particles in thermal equilibrium with air. A previously unknown effect of saturation of nighttime TN concentration was observed. It is explained in terms of a dynamic equilibrium state, which sets in the absence of vertical convection between the neutrons escaping from the ground and their losses in nuclear reaction in the air. The results described can be used for the determination of ground concentration of ambient radon and its dynamics in boundary layer of atmosphere as well as in other geophysical studies.


[FULL TEXT] [PDF]*
Print this article     Email this article
Next article
Previous article
Table of Contents
Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
Citation Manager
Access Statistics
Reader Comments
Email Alert *
Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed182    
    Printed3    
    Emailed0    
    PDF Downloaded45    
    Comments [Add]    

Recommend this journal