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Determination of the air-kerma in mammography x-rays at NIM
Ji Wang,Siming Guo,Pingzhou Lu,Jinjie Wu,Ying Liu,Ruonan Li,Yulong Wang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.4
Breast cancer has become the top killer of women’s health in the world, and mammography X-ray has become the gold standard in various diagnostic methods, due to its low energy, low dose and high resolution. To meet the quality control requirements of mammography X-rays dose in clinical, the National Institute of Metrology (NIM,China) has established a mammography X-ray reference radiation facility. The radiation quality half-value layer (HVL) range from 0.274 to 0.364 mm (aluminum) meets the requirements of IEC61267, and a new parallel-plate free-air ionization is designed. At NIM, various correction factors were measured and simulated, and fnally, the absolute measurement of the X-ray air kerma rate of the mammography was realized. By analysis, the combined standard uncertainty of the air kerma is 0.44%. Provide traceability services for the use and quality control of mammography in China.