Can you tell me the following about gamma rays?
Gamma rays are just high energy light. They are just another form of electromagnetic radiation, just like visible light, microwaves, infrared waves, x-rays, etc...Gamma rays are the most powerful of all forms of electromagnetic radiation. what vibrates: Nothing, Gamma rays and all other electromagnetic radiations are created by sub-atomic particle interactions, ie nuclear fusion, fission, radioactive decay, antimatter annihilation, etc... how big and wavelength are the same question: gamma rays start at around 10^-11 meters and range down to around 10^-17 meters. so between .00000000010 meters and .00000000000000010 meters. pretty small. what stops them: Anything material with a high enough atomic number and density. Lead is often used. But the higher the energy of the gamma rays, the more shielding you need obviously. Why are they radioactive: They are a form of ionizing radiation, created by a radioactive process but not radioactive themselves. What ionizing radiation means is that they are so energetic, that when they pass by an atom, the gamma rays will actually rip the electrons right out of their orbits around the atoms. Imagine that happening to the atoms in the cells in your body and you can see why that might be a bad thing. the definition of radioactivity is the process by which ustable atomic nuclei emit sub-atomic particles (they RADIATE these other particles, hence radioactivity) Gamma rays are one possible product. hope this helps
Which of the following materials is most effective for stopping gamma radiation?
answer d) Electromagnetic radiation consists of emissions of electromagnetic waves, the properties of which depend on the wavelength. X-ray and gamma radiation are best absorbed by atoms with heavy nuclei; the heavier the nucleus, the better the absorption. In some special applications, depleted uranium is used, but lead is much more common. Barium sulfate is used in some applications too. However, when cost is important, almost any material can be used, but it must be far thicker. Most nuclear reactors use thick concrete shields to create a bioshield with a thin water cooled layer of lead on the inside to protect the porous concrete from the coolant inside.
What stops gamma rays?
It depends on the energy of the gamma ray. usually the 1/2 value thickness is quoted for a given range of energies. this is the thickness of material at which the energy of the gamma rays drops by 1/2. Called the HVL (Half Value Layer).For low energy gamma rays like X-rays, less than 0.3 mm of lead is the 1/2 HVL, or 20mm of concrete.After 7 HVL thickness the radiation is attenuated to less than 1% of it’s original energy level, so for low energy X-Rays this would be about 2mm of lead.As the energy of the gamma rays goes up, so does the HVL, in PET systems, the gamma rays are 511 KeV (antimatter radiation from positron/electron annihilation), and the HVL for lead is about 4mm. Most PET shielding is therefor about 4-6 inches of lead.This is also why PET radiation workers don’t wear shielding (like the lead aprons/gloves used in X-Ray), as no-one can wear inches of lead shielding. You are better off not wearing shielding, the gamma rays tend to go straight through you, and you can be faster and more accurate with no shielding slowing you down. Shielding for PET systems tends to be in fixed locations.The denser the shielding material, the lower the HVL, Tungsten is one of the best shielding materials, and is used in some PET isotope transporters, but is so heavy it is hard to move. Depleted Uranium is also a good gamma radiation shield.All of this applies to gamma radiation only, the other types of ionizing radiation (alpha, beta, neutron) have different considerations.
Which of the following will stop gamma rays?
paper aluminum foil concrete skin Question 7.7. Which of the following symbols represents half-life? Ea t½ Α Β Question 9.9. Which of the following requires a critical mass? leptons beta emission gamma emission fission Question 10.10. Which of the following is a nucleon? electron up quark down quark neutron
Which of the following materials is most effective for stopping gamma radiation?
a) several cm of lead. Gamma rays are similar to X-rays but have shorter wavelengths and are more penetrating. Even X-rays would pass through all but thick lead.
Can a gamma ray be stopped by something not solid?
Can a gamma ray be stopped by something not solid?Yes. Gamma rays interact primarily with electrons, so anything with electrons will stop the gamma rays. The more electrons, the better it will stop gamma rays.If you want a lot of electrons in a small volume, you need somethings with high density and a high atomic number. Liquids can have a reasonably high density, but gasses have a low density. Generally, material with high atomic number, like lead, are not liquid at room temperature. An exception would be mercury which has a high atomic number and a high density and is a liquid at room temperature. Mercury would be a good gamma ray shield, toxicity aside.Note that I am not taking the word “stop” literally. Gamma rays can be attenuated, but mathematically reducing a gamma ray field to zero is a limiting function.
A few inches of lead will stop which of the following types of radiation?
A few inches of lead will not stop gamma rays
If a scientist wanted to stop alpha B particles and gamma rays, which of the following materials use?
A few sheets of paper will stop alpha particles. A few layers of aluminum foil will stop beta particles. Several centimeters of lead are needed to stop gamma rays.
Which of the following can pass through the human body?
gammas and x-rays can.