Adentitious
发表于 2025-3-21 19:44:23
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Ophthalmologist
发表于 2025-3-21 22:16:37
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痛得哭了
发表于 2025-3-22 00:54:23
Introduction,m artificial sources produced by mankind came into play in the twentieth century. These radioactive sources have been introduced and used in the course of the rapid development of medical diagnostics and therapy and natural science and technology.
Trigger-Point
发表于 2025-3-22 05:54:28
Basic Nuclear Physics,Atoms consisting of a compact nucleus and an electron shell have diameters on the order of 10. m. Atomic nuclei are much smaller than atoms, their diameter is on the order of 10. m. Nearly all the mass of an atom is concentrated in the atomic nucleus.
宏伟
发表于 2025-3-22 09:19:30
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Constituent
发表于 2025-3-22 14:41:06
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低三下四之人
发表于 2025-3-22 20:30:31
Non-Ionizing Radiation,nd X-ray-generating devices. . radiation and X rays are electromagnetic waves: they differ from visible light or microwave radiation only by their energy or, equivalently, by their frequency or wavelength. It is only natural to ask to what extent electromagnetic radiation of other frequencies might be dangerous for humans.
Loathe
发表于 2025-3-22 22:58:37
Radiation-Protection Glossary1,f neutrons is best done with substances containing a high fraction of hydrogen. Neutrons can also be captured in boron or cadmium. . rays are of very short range and can be stopped even with thin foils. . rays should be absorbed with low-. materials (1 cm aluminum or 2 cm plastic) to avoid bremsstrahlung.
opalescence
发表于 2025-3-23 02:38:44
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VERT
发表于 2025-3-23 08:35:22
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