Aiming at the problem of spectral drift in the in situ seawater γ-spectrometry,the characteristic energy X/γ-rays emitted by 138 La inherent in the lanthanum bromide detector crystal are used to form characteristic peaks on the energy spectrum.The drift of the complex peak is controlled by the counting system to achieve the peak stabilization of the whole spectrum.By solving the key problems of rapid peak search,determining the net count rate of composite peaks and the half height and width of composite peaks,and micro-voltage control,the spectrum stabilization technology based on 138 La composite peaks is established.It has been successfully used in the development of in situ gamma spectrum measurement system for seawater.
underwater γ energy spectrumlanthanum bomidetemperature effectspectral driftspectrum stabilization
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