The process for the construction of DS02

抄録

There has been observed the difference between measured neutron activation data and DS86 calculation. The measured data were lower than DS86 at the short range and higher more than 800m ground range. The collaboration between US and Japan WGs began in 1994 and finished in 2003. The new AMS technique has been developed to measure neutron activation of Cl-36 and Ni-63. At the end of the 2001 we decided to perform intercomparison study between Eu-152 and Cl-36 measurements to solve the discrepancy between the measurement and DS86. The 9 exposed samples were selected for intercomparison of the Eu-152 and Cl-36 measurements. Eu-152 was measured by the Komura's group of Kanazawa University. Cl-36 was measured at three laboratories: Nagashima's group at University of Tsukuba, Straume's group University of Utah and Ruehm's group at Technical University of Munich. As the result of the intercomparison study, the Eu-152 and Cl-36 data each other agreed well within 1.2km and also the data agreed with DS02. [J Radiat Res 44:382-383 (2003)]