One half the γ rays from 99m Tc are absorbed by a0.170-mm-thick lead shielding. Half of the γ rays that passthrough the first layer of lead are absorbed in a second layerof equal thickness. What thickness of lead will absorb all butone in 1000 of these γ rays?
Radioactive decay
The emission of energy to produce ionizing radiation is known as radioactive decay. Alpha, beta particles, and gamma rays are examples of ionizing radiation that could be released. Radioactive decay happens in radionuclides, which are imbalanced atoms. This periodic table's elements come in a variety of shapes and sizes. Several of these kinds are stable like nitrogen-14, hydrogen-2, and potassium-40, whereas others are not like uranium-238. In nature, one of the most stable phases of an element is usually the most prevalent. Every element, meanwhile, has an unstable state. Unstable variants are radioactive and release ionizing radiation. Certain elements, including uranium, have no stable forms and are constantly radioactive. Radionuclides are elements that release ionizing radiation.
Artificial Radioactivity
The radioactivity can be simply referred to as particle emission from nuclei due to the nuclear instability. There are different types of radiation such as alpha, beta and gamma radiation. Along with these there are different types of decay as well.
One half the γ rays from 99m Tc are absorbed by a
0.170-mm-thick lead shielding. Half of the γ rays that pass
through the first layer of lead are absorbed in a second layer
of equal thickness. What thickness of lead will absorb all but
one in 1000 of these γ rays?
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