A compact ultra-clean system for deploying radioactive sources inside   the KamLAND detector
  We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibration. The device worked by paying out and reeling in precise lengths of a hanging, small-gauge wire rope (cable); an assortment of interchangeable radioactive sources could be attached to a weight at the end of the cable. All components exposed to the radiopure liquid scintillator were made of chemically compatible UHV-cleaned materials, primarily stainless steel, in order to avoid contaminating or degrading the scintillator. To prevent radon intrusion, the apparatus was enclosed in a hermetically sealed housing inside a glove box, and both volumes were regularly flushed with purified nitrogen gas. An infrared camera attached to the side of the housing permitted real-time visual monitoring of the cable's motion, and the system was controlled via a graphical user interface. 
T.I. Banks, S.J. Freedman, J. Wallig, N. Ybarrolaza, A. Gando, Y.   Gando, H. Ikeda, K. Inoue, Y. Kishimoto, M. Koga, T. Mit...
physics.ins-det hep-ex nucl-ex