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Radiation Protection Dosimetry 2005 115(1-4):648-651; doi:10.1093/rpd/nci005
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Spatial distributions of residuals produced inside a spallation target

Wladyslaw Pohorecki1,*, Tomasz Horwacik3, Jerzy Janczyszyn1, Stefan Taczanowski1, Valentin P. Bamblevski2, Sergey A. Gustov2, Igor V. Mirokhin2, Aleksander G. Molokanov2 and Aleksander Polanski4

1 AGH University of Science and Technology, Faculty of Physics and Nuclear Techniques, Al. Mickiewicza 30, 30-059 Cracow, Poland
2 Joint Institute of Nuclear Research, Dzhelepov Laboratory of Nuclear Problems, Dubna, Russia
3 Institute of Nuclear Physics, ul. Radzikowskiego 152, 31-342, Cracow, Poland
4 Joint Institute of Nuclear Research, Laboratory of Information Technologies, Dubna, Russia

* Corresponding author: poho{at}uci.agh.edu.pl

The spallation target model of an accelerator driven system (ADS), consisting of six 5cm thick and 16cm in diameter Pb segments, was constructed. Three sets of 17 Bi samples (1/2 inch in diameter and 1 mm thick) were placed in 3 Pb disc-shaped holders inside the target at 5, 10 and 15 cm from its front. After irradiation with 660 MeV proton beam {gamma}-spectra of radioisotopes produced in Bi were collected several times for each sample with the use of HPGe detectors in order to identify the radioisotopes and to determine their absolute activities. Their spatial distributions were then compared with respective values obtained in the calculations made with the use of FLUKA and/or MCNPX code. A fair agreement with the experiment has been observed.


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