Materials:
* Most materials: Gamma rays can easily pass through paper, wood, aluminum, and even several inches of lead.
* Concrete: While concrete offers some resistance, thicker layers are needed to significantly attenuate gamma rays.
* Water: Water, being dense, can absorb some gamma rays, but significant amounts are needed.
* Earth's atmosphere: The atmosphere absorbs much of the gamma rays from space, but some still reach the surface.
The degree of penetration depends on factors like:
* Energy of the gamma ray: Higher energy gamma rays are more penetrating.
* Density of the material: Denser materials provide greater resistance.
* Thickness of the material: The thicker the material, the more it absorbs.
What stops gamma rays?
* Lead: Lead is a good absorber of gamma rays, but it requires substantial thicknesses to significantly reduce them.
* Concrete: Thick layers of concrete can offer protection.
* Water: Large bodies of water can act as a shield.
* Shielding materials: Special shielding materials, like Tungsten, are used in high-energy applications like nuclear reactors.
Applications:
* Medical imaging: Gamma rays are used in PET scans and radiation therapy.
* Industrial uses: They are used in sterilization, flaw detection, and gauging.
* Astronomy: Astronomers study gamma rays from space to learn about black holes and other celestial objects.
Overall: Gamma rays are highly penetrating and require significant amounts of dense materials to be effectively stopped.
