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1)  lead block
铅挡块
1.
Make,application and quality control of low melting-point lead block;
低熔点铅挡块的制作、应用以及质量保证
2)  conformal plumbic blocks
适形铅挡块
1.
Objective To discuss errors of conformal plumbic blocks made with manual cutter and automatic cutter.
目的:探讨手动切割机与自动切割机制作适形铅挡块的误差。
2.
Objective To discuss the differences between conformal plumbic blocks made and traditional mold and new mold.
目的探讨传统模具与新型模具制作适形铅挡块的误差。
3)  three-dimensional physics compensator
三维熔铅挡块
4)  low-melting-point lead block
低熔点铅挡块
1.
Application of technique of face-neck combined individualized low-melting-point lead block in radiotherapy of nasopharyngeal carcinoma
个体化低熔点铅挡块技术在鼻咽癌放疗中的应用
5)  low-melting-point lead irregular shield
低熔点铅不规则挡块
1.
Objective To evaluate the radiotherapy effects on nasopharyngeal carcinoma with low-melting-point lead irregular shield technique.
目的 探讨低熔点铅不规则挡块等中心治疗在鼻咽癌放疗中的价值。
6)  lead-alloy block
挡铅
1.
The study about combined multileaf collimator with lead-alloy blocks form a mantle field in radiotherapy of Hodgkin' s disease
多叶光栅与挡铅联合设野在斗蓬野布置中的研究
补充资料:铅-铅测年
分子式:
CAS号:

性质:238U和235U两个母体铀同位素的特性实质相同,所产生的放射性成因206,207Pb的方程可合并为(207Pb/206Pb)=[(235U/238U)](t-1)。235U/238U现在的比值是1/137.8,利用非放射性成因‘稳定’204Pb作为参考同位素,作(207Pb/204Pb)与(206Pb/204Pb)的Pb-Pb等时线,应用方程计算年龄,式中(207Pb/204Pb)和(206Pb/204Pb)0是初始比值。

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