this study aims to give data concrning phantom material made in iran i'rom a natural rubber which is used for obtaining calibration data for patient dose measurements in nuclear medicine applications of radionuclides for therapy and diagnosis.is showed to be a tissue equivalent material cheap (25000 rials the material itself and 35000 rials the process of casting and moulding etc.), easily avai...

An error in the program for verifying the Ankeny-Artin-Chowla (AAC) conjecture is reported. As a result, in the case of primes p which are ≡ 5 mod 8, the AAC conjecture has been verified using a different multiple of the regulator of the quadratic field Q(√p) than was meant. However, since any multiple of this regulator is suitable for this purpose, provided that it is smaller than 8p, the main...