152Eu is a radioisotope with a half-life of approximately 14 years.  A student works with a sealed source of 152Eu with a current activity of 1 μCi. Complete the following table. Atomic Number         Mass Number         Number of Neutrons         Half-Life   14 years     Current Activity   1.0 μCi     Number of Half-Lives between now and 70 years from now         Remaining activity 70 years from now (as a percentage)    %   Report to 2 significant figures Remaining activity 70 years from now (in μCi)    μCi   Report to 2 significant figures

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The question is: The activity of Arsenic-76 after 157.8 hrs is 120.2 micro milicuries. What was the original activity in mCi? One half life of Arsenic-76 is 26.3 hours. 6 half-lives have passed after 157.8 hrs.

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Effective The table of parent-daughter isotopes shows three different isotope pairs that are used in radioisotope dating. Examine the chart and answer the following questions. Half-Life Isotope Daughter of Parent Dating Range (y) Parent uranium-235 lead-207 710 milion >10 million 10 000 to 3 billion potassium 40 argon 40 1.3 bilion 22. Lead-207 is called the daughter of uranium-235. What does this mean? carbon-14 nitrogen-14 5730 up to 50 000 23. How old is a rock sample that oontains uranium-235 and lead-207 in equal amounts? 24. The age of Earth was first established in 1953 when Claire C. Patterson of the California Institute of Technology used a uranium-lead clock to analyze rock. In comparing amounts of uranium-235 with lead-207, he established that about 8 half-lives of uranium-207 had passed since the rock formed. Using this data, estimate the age of Earth. 25. lodine-131 is a radioactive substance that can be used to treat certain thyroid conditions. It has a half-life of 8…

If the half-life of 1-131 is 5.2 days, how many days would it take for only 3.2 x 10-2 grams of I-131 to be left in Mr. Miller's body if Dr. Goodie started him on an initial dose of 6.4 grams? (Round your answer to two decimal points)

Carbon-14 (14C) is a naturally occurring radionuclide of carbon with about 5,730 years half-life. If 12C has 6 protons, 6 neutrons, and 6 electrons. How many neutrons does 14C has?

55Fe is a radioisotope with a half-life of approximately 3 years.  A student works with a sealed source of 55Fe with a current activity of 1 μCi. Complete the following table. Atomic Number         Mass Number         Number of Neutrons         Half-Life   3 years     Current Activity   1.0 μCi     Number of Half-Lives between now and 12 years from now         Remaining activity 12 years from now (as a percentage)    %   Report to 2 significant figures Remaining activity 12 years from now (in μCi)    μCi

A radioactive iodine sample has a half life of 6 days. If the original sample is 24 grams, how much radioactive sample remains after 24 days? 22.5 grams 3 grams 1.5 grams 0.75 grams 4:44 PM 4/8/2021 P Type here to search home prt sc delete backspace wnu lock & 3 DQ 1- Need Ppenadic toble home

Bismuth-210 is beta emitter with a half-life of 5.0 days. Part A If a sample contains 1.5 g of Bi-210 (atomic mass = 209.984105 amu), how many beta emissions would occur in 13.9 days? Express your answer using two significant figures. 195] ΑΣΦ Submit Part B Request Answer Submit ? If a person's body intercepts 5.3 % of those emissions, to what dose of radiation (in Ci) is the person exposed? Express your answer using two significant figures. VE ΑΣΦ Request Answer beta decays ? Ci