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例1来自质子源的质子(初速度为零),经一加速电压为800kV的直线加速器加速,形成电流强度为1mA的细柱形质子流,已知质子电量e=1.6×10-19C,这束质子流每秒打在靶上的质子数__,假定分布在质子源到靶之间的加速电场是均匀的,在质子束中与质子源相距L和4L的两处,各取一段极短的相等长度的质子流,其中的质子数分别为n1和n2,则n1:n2=__.
Example 1 Protons from a proton source (the initial velocity is zero) are accelerated by a linear accelerator with an accelerating voltage of 800 kV to form a thin cylindrical proton flow with a current density of 1 mA. The known proton energy e = 1.6 x 10-19C. The number of protons hitting the target per second by the beam proton flow is assumed to be uniform, and the acceleration field distributed between the proton source and the target is assumed to be uniform. In the proton beam, there are two points, L and 4L away from the proton source. A short, equal-length proton flow, where the number of protons is n1 and n2 respectively, then n1:n2=__.