AMIGA at the Auger Observatory: the scintillator module testing systemM. Platino, Matías Rolf Hampel, A. Almela et al.|Journal of Instrumentation|2011 AMIGA is an extension of the Pierre Auger Observatory that will consist of 85 detector pairs each one composed of a surface water-Cherenkov detector and a buried muon counter. Each muon counter has an area of 30 m2 and is made of scintillator strips with doped optical fibers glued to them, which guide the light to 64 pixels photomultiplier tubes. The detector pairs are arranged at 433 m and 750 m array spacings. In this paper we present the testing and initial calibration system for the scintillator modules that constitute each muon counter of AMIGA. The scintillator modules are tested with a "scanner" that consists of an x−y positioning system that moves a 5 mCi 137Cs radioactive source over the module taking data at fixed locations. The scanner both tests the module for possible fabrication defects and stores the light-attenuation curve parameters. A complete scanning process of a 64 strip scintillator module has been performed and results are presented. Also, attenuation curves obtained with scanner and with background muons are compared with satisfactory results.
Testing of photomultiplier tubes for use in the surface detector of the Pierre Auger observatoryDavid Barnhill, F. Suárez, K. Arisaka et al.|Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment|2008 Optical crosstalk in SiPMsMatías Rolf Hampel, A. Fuster, Carlos Varela et al.|Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment|2020 PURIFICATION OF THORIUM FROM URANIUM-233 PROCESS RESIDUEOren F. Webb, R. A. Boll, A. Lucero et al.|Separation Science and Technology|1999 ABSTRACT Thorium-229 can be used to produce 213Bi. Researchers in phase I human trials are investigating the use of antibodies labeled with 213Bi for selectively destroying leukemia cells. Other types of cancer may potentially be treated using similar approaches. Crude 229Th was liberated from Rachig rings by sonication in 7.5 M HNO3 followed by filtration. Contaminants, included significant levels of uranium, a number of other metals, and radiolytic by-products of di-(2-butyl) phosphoric acid extractant (which was used in the original separation of 233U from thorium). Thorium was selectively retained on Reillex HPQ anion-exchange resin from 7.5 M HNO3 at 65°C, where U(VI), Ac(III), Fe(III), Al(III); Ra(II), and Pb(II) were eluted. Thorium and uranium isotherms on Reillex HPQ are reported. The thorium was then easily eluted from the bed with 0.1 M HNO3. To overcome mass transfer limitations of the resin, the separation was conducted at 65°C. The resin stood up well to use over several campaigns. Other res...
Analog multiplexer for testing multianode photomultipliers used in AMIGA project of the Pierre Auger ObservatoryA. Lucero, A. Almela, F. Suárez et al.|Journal of Instrumentation|2015 Analog multiplexer for testing multianode photomultipliers used in AMIGA project of the Pierre Auger Observatory, A. Lucero, A. Almela, F. Suarez, C. Reyes, A. Cancio, A. Fuster, F. Gallo, M.R. Hampel, M. Platino, M. Videla, O. Wainberg, D. Yelos, A. Etchegoyen