Yttrium-90 is used in radioisotope therapy to treat various neuroendocrine tumors.Yttrium-90 has a half-life of 64 h. A sample of 90Y has an activity of 2.5×107 Bq when first measured. (a) What is the decay constant for 90Y ? (in s−1 )? (b) How many atoms of 90Ymust be in the sample initially? (c) What fraction of the atoms of 90Y will be left in the sample after just 1 hour?
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.
Yttrium-90 is used in radioisotope therapy to treat various neuroendocrine
tumors.Yttrium-90 has a half-life of 64 h. A sample of 90Y has an activity of 2.5×107 Bq when
first measured. (a) What is the decay constant for 90Y ? (in s−1
)? (b) How many atoms of 90Ymust
be in the sample initially? (c) What fraction of the atoms of 90Y will be left in the sample after
just 1 hour?
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