摘要：Specific activities (Bq/g-element) of residual neutron-induced radionuclides by the JCO criticality accident were measured for soil, concrete block and chemical reagent samples collected in the JCO campus. Induced radionuclides such as 24 Na, 46 Sc, 54 Mn, 59 Fe, 60 Co, 65 Zn, 82 Br, 122 Sb, 134 Cs and 140 La were detected in the samples, depending on the ground distance from the accident point and the sampling date. Apparent thermal, epi-thermal and fast neutron fluences, which reached the sample at each point, were roughly estimated from the specific activities and cross sections of the target nuclides taken from a literature. The present data are believed to be important as validation data for a three-dimensional neutron transport model calculation.
关键词：JCO criticality accident; Neutron activation; Neutron fluence; Soil; Chemical reagent
