Low temperature light yield measurements in NaI and NaI(Tl) C. Sailer, B. Lubsandorzhiev, C. Strandhagen and J. Jochum Eur. Phys. J. C, 72 6 (2012) 2061 Published online: 27 June 2012 DOI: 10.1140/epjc/s10052-012-2061-7