Now when it comes to radiation protection, people naturally think of lead plate. So how did the lead plate become such a big task? What is the radiation protection principle of lead plate? In fact, any substance can block nuclear radiation, such as gamma rays. But the difference is that the blocking ability is different. The blocking ability mainly depends on two aspects; 1) Atomic number 2) the density of the material obviously, the higher the density of the material, the stronger the blocking ability. As for the atomic number, generally, the higher the atomic number, the stronger the blocking ability. After the gamma ray enters the material, the photoelectric effect and Compton effect generally occur. The probability of the two effects is related to the atomic number of the barrier material. The higher the atomic number, the greater the probability of the effect. The atomic number of lead is 82. In addition to the above two factors, the lead plate is also related to the energy of gamma ray itself. The higher the energy, the smaller the probability of photoelectric effect and Compton effect. The more penetrating gamma rays are. The weaker the blocking ability of the equivalent substance. The atomic number of lead plate is 82, which is a substance with high atomic number in nature. Of course, the ability to block nuclear radiation is relatively strong. Substances that are higher than lead are more resistant. Unfortunately, these substances are rare on earth and relatively expensive (such as gold with atomic number 79 and bismuth with atomic number 83). What's more, these substances are generally radioactive. Of course, it is better to use lead to block nuclear radiation protection.