| 摘要 |
An apparatus utilizing filter-fluorescer combinations is provided to measure short bursts of high fluence x-rays above 120 keV energy, where there are no practical absorption edges available for conventional filter-fluorescer techniques. The absorption edge of the prefilter is chosen to be less than that of the fluorescer, i.e., EPRF<EF, contrary to the prior art technique EPRF>EF. In this way, the response function is virtually zero between EPRF and EF and well defined and enhanced in an energy band of less than 1000 keV above the 120 keV energy.
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