Abstract
Investigation of radioactive fallout in Japan has started in 1955, being conducted at that time at various institutions such as relevant divisions of local governments, research establishments, and universities.
The system of investigation and monitoring network have been organized and expanded since then, and large amounts of data are accumulated until now.
This report describes the centralized management system of data on environmental radiations and radioactivities worked out at Japan Chemical Analysis Center, using YHP-3000II computer system in order to meet the increasing requirement of serviceable and readjusted data.
