A nuclear data acquisition system flow control model

A general Petri-Net representation of a nuclear data-acquisition model is presented. This model provides for the unique requirements of a nuclear data-acquisition system, including the capabilities of concurrently acquiring synchronous and asynchronous data, of providing multiple priority levels of flow-control arbitration, and of permitting multiple input sources to reside at the same priority without the problem of channel lockout caused by a high-rate data source. Finally, a previously implemented gamma-camera/physiological-signal data-acquisition system is described using the models presented.