Liquid Argon Pollution Tests of the ATLAS Detector Materials at IBR-2 Reactor in Dubna

A cold test facility has been in operation since October 1998 at the IBR-2 reactor of JINR, Dubna. During four measurement campaigns, various samples of the ATLAS forward (FCAL) and hadronic end cap (HEC) calorimeter materials have been exposed to a fast neutron (En 100 keV) uence of about 10 16 n cm . The samples were immersed in a liquid argon cryostat, and an -cell has been used as purity monitor. Results of the liquid argon pollution study obtained during these measurement campaigns are presented. 1 Description of the facility General characteristics of the beam-line and details about dosimetry measurements performed at the IBR-2 reactor can be found in paper [1]. The cold test facility has been installed on both sides of a 6 m long shielding movable platform. The facility includes a cryostat which is lled with liquid argon. The cryostat containing test samples of materials is mounted on the support frame at the head of the 1 e-mail address for contacts: leroy@LPS:UMontreal:CA 2 e-mail address for contacts: cheplako@sunse:jinr:ru