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在中国原子能科学研究院重水反应堆热柱上建立了热中子参考辐射场。中子能谱用飞行时间法测量；中子注量率用金活化箔和２３５Ｕ 电离室两种探测器进行绝对测量，其结果分别为１．１４×１０６（１±１．２ ％ ） ｃｍ － ２·ｓ－ １和１．１５×１０６（１±２．２ ％ ） ｃｍ － ２·ｓ－ １。对束的空间分布、镉比和γ本底剂量也进行了测量。其中，镉比为１．１×１０４ （１±１０ ％ ），γ本底剂量在４０ ｃｍ 和１００ ｃｍ 处分别为５ ｍ Ｇｙ·ｈ－ １和０．９ ｍ Ｇｙ·ｈ－ １。
Thermal neutron reference radiation field was established on the hot column of heavy water reactor of China Institute of Atomic Energy. The neutron energy spectrum was measured by time of flight method. The neutron fluence rate was measured by two kinds of detectors: gold activated foil and 235U ionization chamber. The results were 1.14 × 106 (1 ± 1.2%) cm - 2 · s-1 and 1.15 × 106 (1 ± 2.2%) cm-2 · s-1. Spatial distribution of the beam, the cadmium ratio, and the gamma background dose were also measured. Among them, the cadmium ratio was 1.1 × 104 (1 ± 10%), and the γ background dose was 5 m Gy · h-1 and 0.9 m Gy · h-1 at 40 cm and 100 cm, respectively.