On the basis of studying many documents, introduced some non radioactive persistent red phosphors and systematically classified them according to their luminescent host.
在大量文献调研的基础上，根据发光基质的不同对目前非放射性长余辉红色磷光粉的研究现状进行了系统的分类介绍。
The model and mechanism of radioactive anomaly are the theoretical basis of radioactive prospecting in the oil and gas fields.
油气田放射性异常模式及其机理，是油气田放射性勘查的重要理论依据。
On the basis of distribution of radioactive elements and geological background, the theory equation of radon exhalation rate is derived from the decay rule of radioactive elements and gas diffusion.
根据放射性元素分布规律、地质背景及放射性元素衰变等，建立了计算氡析出率的理论公式。
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