科研之友
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摘要
Lead glass production has not yet been developed in Colombia, limiting the improvement of radiological protection elements. In answer to this limitation a number of samples of lead glass with the necessary features for ionizing radiation attenuation have been developed by the Medical Physics Group at the National University of Colombia in Bogota. The optimal characteristics were found in glass with 50% of lead oxide (PbO). Experiments showed that more than 50% PbO results in an opaque glass and is much more difficult to fabricate. For the optimal mole fraction a linear absorption coefficient of 0.35 cm(-1) was found. This means, for energy of 662 keV, the equivalent thickness of lead to be used would be 3.0 mm. For the same energy, the sample's half-value layer (HVL) is the same as iron concrete, which is commonly used for shielding. Lastly, the use of a 1-cm gap of air between glass layers results in an increase of up to 20% absorption when 40% lead-compounded glass is used.
- 出版日期2014-9
- 单位中国地震局
