One of the problems of in-air testing of nuclear weapons is the danger of radioactive fallout. One of the most problematic nuclides in such fallout is strontium-90, which breaks down by beta decay with a half-life of 28 years. It is chemically similar to calcium, and therefore can be incorporated into bones and teeth. (a) What is the daughter nucleus of the Sr-90 decay? (b) What percentage of the original level of Sr-90 is left after 56 years? (c) How long would you have to wait for the radiation to be reduced to 6.25% of its original level

Q: Two radioactive samples, X, Y have the same number of atoms at t = 0. Their half lives are 3h and 4h…

A: The formula of the radioactivity is  R = Ro e-0.693 tT where, Ro is the initial activity, t is the…

Q: Your company develops radioactive isotopes for medical applications. In your work there, you measure…

A: We know,  the activity equation is given by A=A0e-λt From the table it is seen that A0=20,000 At…

Q: Yttrium-90 is the daughter nucleus of an isotope that is a major waste product of nuclear reactions.…

A:

Q: The half-life of 131I is 8.04 days. (a) Convert the half-life to units of seconds.  s (b) What is…

A: As per guidelines , only 3 subparts are solved here. The half-life of 131I is 8.04 days. (a)  1 days…

Q: An artifact classified as charcoal, found in a site at Epirus, Greece, is found to have a 14C…

A: initial radioactivity(Ro)=0.255 counts per second final radioactivity(R)=4.36 X 10-2 counts per…

Q: The activity of a sample of a radioisotope at some time is 10.5 mCi and 0.46 h later it is 7.00 mCi.…

A: Initial activity of isotope is Ro = 10.5 mCi Activity after some time is R = 7.00 mCi Time elapsed…

Q: Radioactive isotopes are often introduced into the body through the bloodstream. Their spread…

A: Given : Half life of 131I (t1/2) = 8.0 d Initial activity (A0) = 325 Bq

Q: You measure the decay rate of a radioactive sample to be 4.225 x 101 Bq. After 139 seconds, the…

A:

Q: e half-life of 131I is 8.04 days. (a) Convert the half-life to seconds.  s (b) Calculate the decay…

A: "Since you have posted a question with multiple sub-parts, as per strict guidelines to us we will…

Q: As a staff scientist at a nuclear power plant, it is your job to understand radioactive substances…

A: Here we use law of radioactive decay to find the answer

Q: Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day,…

A: The term "half-life" is used in the areas of physics and chemistry that deal with radioactivity and…

Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.