Tritium, deuterium and gamma-emitting nuclides in plant leaves in the JCO campus

The effects of the JCO criticality accident on the tritium, deuterium and gamma-ray nuclide concentrations in plant leaves in/around the JCO campus in Tokai-mura, Ibaraki prefecture were investigated. No significant differences were detected between the tritium and deuterium concentrations in tissue-free water in the samples collected from the JCO campus and those from outside the JCO environment including Tokyo. The organically bound deuterium concentration in each plant sample was lower than the free water deuterium concentration. 140La and 140Ba were detected in one plant sample from the JCO site.