Fig. 1. Preamplifier circuit and its output signal

Fig. 2. Principle of shadow peaks formation

Fig. 3. Repaired result by fast correction and shaping result

Fig. 4. Repaired result by slow correction and shaping result

Fig. 5. Structure chart of the detection system

Fig. 6. Characteristic peak contrast map before and after correction
(a): Characteristic peak of Fe; (b): Characteristic peak of Sr