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 ²⁴Na, ⁴⁶Sc, ⁵⁴Mn, ⁵⁹Fe, ⁶⁰Co, ⁶⁵Zn, ⁸²Br, ¹²²Sb, ¹³⁴Cs and ¹⁴⁰La 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.

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