记录元素浓度的测井方法，利用中子轰击原子核，使其激活后释放出伽马射线，根据伽马射线的特征能量级可获得元素浓度。
A log of elemental concentrations derived from the characteristic energy levels of gamma rays emitted by a nucleus that has been activated by neutron bombardment.
然后，用第二个磁场短时轰击这些原子核，使其脱离第一个磁场阵列。
These nuclei are then zapped briefly with a second magnetic field that knocks them out of alignment with the first one.
当一个中子轰击一个原子核的时候，这个核可能会俘获这个中子，从而变的极不稳定。
When a neutron hits an atomic nucleus, the nucleus can absorb the neutron and become unstable.
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