Anything can block nuclear radiation like gamma rays. But the difference is blocking power. Blocking capacity is mainly determined by two aspects
1) Atomic number
2) The density of the material is obvious, the higher the density of the material is, the stronger the plugging ability is. This conclusion can also be felt.
As for the atomic number, the higher the atomic number, the stronger the resistance. The reason involves some physical knowledge.
Give you a brief introduction, I hope you can understand. After the gamma ray enters the material, the photoelectric effect and Compton effect are mainly produced. The possibility of these two effects is related to the number of atoms in the block. The higher the number of atoms, the greater the possibility of this effect. In addition to the above two factors, it is also related to the energy of gamma ray itself. The higher the energy, the less likely the photoelectric effect and Compton effect will be. The more penetrating the gamma rays are. A weaker barrier is equivalent to matter. As for your second question, "is there anything else known to block or reflect radiation?".
As I said above, anything can be, as long as there is the ability to block it. The atomic number of lead is 82, which is the highest in nature. Of course, the ability to prevent nuclear radiation is stronger. Substances higher than lead are more resistant. Unfortunately, these materials are rare and relatively expensive on earth (for example, gold has an atomic number of 79, bismuth has an atomic number of 83), and, worst of all, they are usually radioactive in themselves. Of course, it's not as good as using lead to protect against radiation. Jinan Ruitian mainly provides lead plate, lead ingot, lead brick, radiation proof lead glass, lead plate door and barium sand