Inventors:
James R. Powell - Shoreham NY
Morris Reich - Flushing NY
Hans Ludewig - Brookhaven NY
Michael Todosow - Miller Place NY
Assignee:
Brookhaven Science Associates - Upton NY
International Classification:
G21G 110
Abstract:
A particle accelerator (12) generates an input particle beam having an initial energy level above a threshold for generating secondary nuclear particles. A thin target (14) is rotated in the path of the input beam for undergoing nuclear reactions to generate the secondary particles and correspondingly decrease energy of the input beam to about the threshold. The target (14) produces low energy secondary particles and is effectively cooled by radiation and conduction. A neutron scatterer (44) and a neutron filter (42) are also used for preferentially degrading the secondary particles into a lower energy range if desired.