医用诊断X射线防护器具的防护性能通常用铅当量表示,根据IEC 61331-1,防护材料衰减性能的测定主要是在40～150kV X射线范围内,研究纯铅、含铅和无铅材料在窄束、宽束以及逆向宽束条件下铅当量的大小。为进一步研究不同测量方法下防护材料的屏蔽性能,需要建立符合标准要求的X射线参考辐射质,并对其能谱进行模拟或测量。依托工业X射线光机,通过添加铝附加过滤和不同厚度铝吸收片,建立了40～150kV范围内8个X射线参考辐射质,测量半值层最大相对偏差为2.8%。利用EGSnrc蒙卡模拟程序,模拟了不同辐射质的X射线能谱,其平均能量与IEC推荐值的最大相对偏差不超过0.4%,满足防护材料X射线铅当量辐射质的要求。
Abstract
The protective performance of medical diagnostic X-ray protective equipment is usually expressed with lead equivalent.According to IEC 61331-1, the measurement of attenuation performance of protective materials is mainly to study the lead equivalent of pure lead, lead-containing and lead-free materials under the conditions of narrow beam, wide beam and reverse wide beam in the range of 40~150kV X-ray. In order to study the shielding performance of protective materials under different measurement methods furtherly, it is necessary to establish the required X-ray reference radiation qualities and simulate or measure the corresponding energy spectrum.Based on the medium energy X-ray radiation device, by adding additional filter, eight X-ray reference radiations qualities in the range of 40～150kV are established and the maximum relative deviation of the HVL is 2.8%. The corresponding X-ray energy spectra are simulated by EGSnrc Monte Carlo simulation program, and the average energy are obtained. The results are consistent with the standard and the maximum relative deviation of average energy is less than 0.4% with IEC. The result can meet the requirements of lead equivalent measurement for X-ray protection materials.
关键词
计量学 /
X射线 /
铅当量 /
辐射质 /
EGSnrc
Key words
metrology /
X-ray /
lead equivalent /
radiation qualities /
EGSnrc
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基金
国家市场监督管理总局质量技术基础能力建设专项(ANL2210)
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