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142La是核燃料裂变燃耗测定用的重要核素,但其半衰期的文献值差异很大。本文详细阐述了用阱式HPGe探测器质量接续法和同轴型HPGe探测器连续跟踪法测定142La半衰期的原理和过程,测定结果为(90.78±0.16)min。
142La is an important nuclide for the determination of fission and burnup of nuclear fuel, but the literature value of its half-life varies greatly. This paper describes in detail the principle and process of determining the half-life of 142 La by the HPGe detector of the well type and the continuous tracking method of the coaxial HPGe detector. The result is (90.78 ± 0.16) min.