[en] The measurement of total β radioactivity in biological sample (Bananas) in Guangzhou are discussed. The limiting values for measuring instrument are analysed and calculated

[en] The samples of spring of the Baiyun Mountain in Guangzhou were measured for total α and β radioactivity by a low background α and β measuring instrument. The data obtained were similar to those for tap water samples in Guangzhou district

[en] According to the present system of the nuclear explosion monitoring equipment (NEME), the imitator of nuclear explosion signals for field operation is urgently needed by NEME, which has been fitted out to the army and some new types that will be finalized soon. The authors have made the imitator for the equipment, and as the cause of this research, it can be used not only in training and maintenance for army but also in research and production for scientific research institutions and industrial enterprise. Function of this imitator is to imitate the NEMP, the light and shock wave signals of nuclear explosion in proper order. The time difference of the process accords with the true location of nuclear explosion. This research is of great military importance

[en] The author describes the primary function and studying situation of the management system of environmental radioactivity level

[en] The author introduces how to carry out nuclear radiation measurement based on single-chip microcomputer