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THE RaDeCC SYSTEM
Description
The RaDeCC system records decay events in three different channels, depending on the time elapsed between two subsequent signals, which reflect the half-lives of decay products in the relative decay chains. One channel counts decay events from the 223Ra decay chain; a second channel counts events from the decay chain following 224Ra; and the third channel (“total”) records basically all events, independent of previous or subsequent events. Each signal in the 223Ra or 224Ra channels is accompanied by events in the “total” channel, but not all events in the “total” channel are due to 223Ra or 224Ra decay products.
The RaDeCC System consists essentially of (1) a large volume scintillation cell, connected to a photomultiplier to detect radioactive decay events, (2) an electronic gateway system, which registers counts and splits the registered events into different channels, depending on the time elapsed until the next event happens, and (3) a pump, which continuously pumps helium through the sample (on an acrylic fiber coated with manganese dioxide, Mn fiber), and subsequently through the scintillation chamber.
