there is no known non-matter way of completely shielding from gamma rays. Gamma rays are a form of electromagnetic radiation that have extremely high energy and penetrate most materials, including traditional shielding materials. They can be effectively attenuated by dense and thick materials such as lead, concrete, or steel, which absorb and scatter the gamma ray photons, reducing their intensity.
However, it's worth noting that certain materials and techniques can be used to mitigate the effects of gamma rays. For instance, high-energy gamma rays can be reduced through a process called "Compton scattering" by using materials with a low atomic number, such as hydrogen-rich substances like water or polyethylene. This scattering process helps to reduce the energy and intensity of the gamma rays, providing some level of protection.
In addition to physical shielding, there are also active radiation detection and monitoring systems that can alert individuals to the presence of gamma radiation so that they can take appropriate measures, such as evacuating the area or seeking additional shielding.
It's important to remember that scientific advancements are ongoing, and new technologies may emerge in the future that could provide more effective non-matter-based shielding mechanisms. However, as of now, traditional matter-based shielding remains the primary method for protecting against gamma rays.