Title: Calibration with MCNP of NaI detector for the determination of natural radioactivity levels in the field
Authors: CINELLI GIORGIATOSITTI LauraMOSTACCI DomizianoBARE Jonathan
Citation: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY vol. 155-156 p. 31-37
Publisher: ELSEVIER SCI LTD
Publication Year: 2016
JRC N°: JRC94462
ISSN: 0265-931X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC94462
DOI: 10.1016/j.jenvrad.2016.02.009
Type: Articles in periodicals and books
Abstract: In view of assessing natural radioactivity with on-site quantitative gamma spectrometry, efficiency calibration of NaI(Tl) detectors is investigated. A calibration based on Monte Carlo simulation of detector response is proposed, to render reliable quantitative analysis practicable in field campaigns. The method is developed with reference to contact geometry, in which measurements are taken placing the NaI(Tl) probe directly against the solid source to be analyzed. The Monte Carlo code used for the simulations was MCNP. Experimental verification of the calibration goodness is obtained by comparison with appropriate standards, as reported. On-site measurements yield a quick quantitative assessment of natural radioactivity levels present (40K, 238U and 232Th ). On-site gamma spectrometry can prove particularly useful insofar as it provides information on materials from which samples cannot be taken.
JRC Directorate:Nuclear Safety and Security

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