科研之友
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摘要
Air kerma in medium-energy x-rays was measured absolutely by parallel-plate free-air chamber;the combined standard uncertainty is 0.22%. A key comparison has been made between the NIM and the BIPM in the medium-energy x ray range. The results show the standards to be in general agreement at the level of twice the stated relative standard uncertainty of 3.1×10-3. The high voltage characteristic and correction factor of ion recombination is researched, the results show the structure and performance of the free-air chamber is stable after more than thirty years run.
- 出版日期2010
