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Radiation Protection Dosimetry 2005 116(1-4):16-18; doi:10.1093/rpd/nci085
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Induced radioactivity in the forward shielding and semiconductor tracker of the ATLAS detector

I. Bedajánek1,2,*, V. Linhart1, I. Stekl1, S. Pospísil1, A. Kolros2 and V. Kovalenko3

1 Institute of Experimental and Applied Physics, Horská 3a/22, CZ-128 00, Prague 2, Czech Republic
2 Faculty of Nuclear Sciences and Physical Engineering, Brehová 7, CZ-115 19, Prague 1, Czech Republic
3 Joint Institute for Nuclear Research, Joliot-Curie 6, Dubna, 141980, Russia

* Corresponding author: bedajane{at}kf-alpha.fjfi.cvut.cz

The radioactivity induced in the forward shielding, copper collimator and semiconductor tracker modules of the ATLAS detector has been studied. The ATLAS detector is a long-term experiment which, during operation, will require to have service and access to all of its parts and components. The radioactivity induced in the forward shielding was calculated by Monte Carlo methods based on GEANT3 software tool. The results show that the equivalent dose rates on the outer surface of the forward shielding are very low (at most 0.038 µSv h–1). On the other hand, the equivalent dose rates are significantly higher on the inner surface of the forward shielding (up to 661 µSv h–1) and, especially, at the copper collimator close to the beampipe (up to 60 mSv h–1). The radioactivity induced in the semiconductor tracker modules was studied experimentally. The module was activated by neutrons in a training nuclear reactor and the delayed gamma ray spectra were measured. From these measurements, the equivalent dose rate on the surface of the semiconductor tracker module was estimated to be <100 µSv h–1 after 100 d of Large Hadron Collider (LHC) operation and 10 d of cooling.


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