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ＭＰＧｅγ探测器的γ能量信号与４πＥβ探测器的β射线能损信号符合后再与ＢＧＯ探测的β＋衰变的正电子湮灭５１１ｋｅＶγ信号作反符合组成一种新的探测系统。该系统可使γ谱测量的康普顿本底下降约一个数量级。对缺中子同位素衰变γ射线的探测作强抑制的同时，丰中子同位素衰变γ射线的探测仍能保持相对单谱为（４６±３）％的高效率。使用该系统对已被合成的丰中子核素２０８Ｈｇ的半寿命进行了一次新的测定。所得新的２０８Ｈｇ半寿命测定值４１．５＋ｍｉｎ，与以往用放射化学母牛法给出的结果一致，测量误差有较大改进。
The γ energy signal of the MPGeγ detector is in agreement with the β-ray energy loss signal of the 4πEβ detector, which is then inversely matched with the β + decaying positron annihilation 511keVγ signal detected by BGO to form a new detection system. The system allows the Compton background of gamma spectrometry to be reduced by about one order of magnitude. While the detection of neutron-isotope decay γ-ray was strongly inhibited, the detection of neutron-rich isotope decay γ ray could still maintain the high efficiency of (46 ± 3)% relative to the single spectrum. A new measurement of the half-life of 208Hg, which has been synthesized, was performed using this system. The resulting new measured half-life of 208Hg 41.5 + min, consistent with the results previously given by the radiochemical cow method, the measurement error is greatly improved.