In class, we used small radioactive sources as demonstrations. One of those source is 137Cs with an activity of 1.85 x 10* decay/sec and emits a gamma ray with energy 662 keV in 95% of all decays. Assume that the source is small and the radiation is emitted uniformly in all directions. The closest student in the room was at a distance of 3.0 m. If the dose rate at a distance of 1.0 m is 0.11 pSv/hour how much dose is the student given during the two hour class period? (a) 1.22 x 10-3³ µSv (b) 2.23 x 10-3 µSv
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.
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