Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient was injected with 20.0 mg of Technetium-99, calculate the mass in mg that will be left after 1 week.

Q: If 3.0 grams of Strontium-90 in a rock sample remained in 1989, approximately how many grams of…

A: In radioactive decay unstable nuclei decay into stable nuclei with emmison of some electromagnetic…

Q: If the amount of a radioactive element decreases from 0.36 g to 90. mg in 22 min, what is its…

A: Half-life (t1/2) is defined as the time required by a substance to reduce to half of its initial…

Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

A:

Q: Thorium-234 has a half-life of 24.1 days. Suppose the initial amount of Thorium-234 is 162.9 mg,…

A: All natural and artificial radioactive decays follows first order kinetics The integrated rate…

Q: Use the References to access important values if needed for this question. The radioactive isotope…

A: To find half life.

Q: An 16 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at…

A: In what year will only 0.625 gm of strontium 90 remain?

Q: If the half-life of 100.0 grams of a radioactive isotope is 8 years, how many grams will remain in…

A:

Q: If a rock contained 12.0 g of ⁴⁰K when the earth was formed 4.54 billion years ago and the half-life…

A: Given information is as follows; Initial mass of ⁴⁰K in the rock A0 = 12.0 g Final mass of ⁴⁰K in…

Q: Complete the table for the radioactive isotope. Isotope 239 Pu, Half Life (In years) 24100, Initial…

A: The amount of time required by an element to reduce to half its quantity is called its half-life.

Q: An 39 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at…

A:

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: 2.101 Fe, a beta emitter with a half-life of 45 days, is used to monitor iron metabolism. a. Write a…

A: Answer:- This question is answered by using the simple concept of radioactive decay of beta particle…

Q: Iodine-125 has a half-life of 60.4 days and is used in radiation therapy to treat prostate cancer…

A: Since the decay reactions are first order reactions Hence we can say  1) Half life = ln(2) / K 2)…

Q: 32) The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute. Wood from the…

A:

Q: The radioactive isotope 125 I has a half-life of 60 days. A sample of this isotope is prepared for a…

A:

Q: Potassium 40 has a half life of 1.3 billion years.  If no half lives had passed, what percentage of…

A: A numerical problem based on half life period, which is to be accomplished.

Q: Iodine-131 has half life of 9 days meaning that after every 9 days the amount of isotope is reduced…

A: The half-life of Iodine-131 is 9 days. Initial amount =10.0 g  Time = 18 days. 18 days means => 9…

Q: If the half life of a radioactive isotope is 3 minutes, how much of an 8 Ci sample would remain…

A:

Q: A radioactive isotope has a half-life of 12.0 seconds. How much of a 100 gram sample is left after…

A: Given  Initial Mass of Sample ( A)0  = 100 gram  Half life time ( t1/2)   = 12 sec  Time ( t ) = 36…

Q: [References) A rock containing 8 mg of plutonium-239 per kg of rock is found in a glacier. The…

A: Radioactive decay, also known as radioactive disintegration, is when an unstable nucleus loses its…

Q: The half life of bismuth-213 is 46 minutes.  How much of a 20 g sample of bismuth-213 is left after…

A: The unstable nucleus or isotope undergoes radioactive decay to form a stable nucleus. This process…

Q: The half–life of a radioactive material is 7.04 days. Assuming you start with a 1.45 mg sample, how…

A: Given , Half life = 7.04 days Time , t = 16 days Initial Weight of sample = 1.45 mg

Q: Radioactive isotopes can be used to calculate the age of materials because their decay rates are A…

A: Interpretation - To tell about radioactive isotope can be used to calculate the age of materials…

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If…

A:

Q: Part 1.1. If a radioactive element has a half-life of 2.5 million years, the amount of parent…

A:

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A:

Q: If the half-life of a radioactive isotope is 32 days, how many half-lives must pass before a 3.0…

A: Radioactive decay follows the first-order kinetics. The half-life of the first-order reaction does…

Q: The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109…

A:

Q: A laboratory investigation shows that a sample of uranium ore contains 5.37 mg of 238/92 U and 2.52…

A:

Q: How does half-life relate to radioactive decay?

A: The half-life (t1/2) is the time required by any quantity to reduce half of its initial value.

Q: How much of a 24-gram sample of Radium-226 will remain unchanged at the end of three half-life…

A: 19) Given : Initial mass of radium-226 = 24 g And time passed = 3 half lives.

Q: 32p is a radioactive isotope with a half-life of 14.3 days. If you currently have 32.7 g of 32P, how…

A:

Q: After 31 years, what mass (in g) remains of a 45.0 g sample of a radioactive isotope with a…

A: Given, Half life (t1/2 )= 7.3 years time (t) = 31 years Number of radioactive atoms present…

Q: U-235 was bombarded with a neutron producing Cs-144 and Rb-90. How many excess neutrons are released…

A: Nuclear transmutation is the process in which one chemical element is converted into new chemical…

Q: If the half-life of a radioactive substance is 4 days how much material will remain after 16 days if…

A:

Q: Half-Life 1189 years Decay Rate, k Complete the table shown to the right for the half-life of a…

A: Given, Half life = 1189 years Decay rate, k = ?

Q: A radioactive isotope has a half-life of 46.3 minutes. how long will it take for the radiation from…

A:

Q: An 80-mg sample of technetium-99m is used for a diagnostic test. If Tc-99m has a half-life of 6.0…

A: Given  Initial Amount of Sample (A)0 = 80 mg  Half life ( t1/2 )  = 6 hour Time ( t )   = 24 hour…

Q: Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient…

A:

Q: 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 48.9 g of "P, how…

A:

Q: If a rock contained 12.0 g of 4°K when the earth was formed 4.54 billion years ago and the half-life…

A:

Q: A solution of sodium iodine containing the radioactive isotope lodine-131 was given to a patient. If…

A: These radioactive decay reactions are the first order reactions . In these type of reactions , rate…

Q: An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this…

A: Decay reactions are first order reactions. Since we know that the relationship between the amount of…

Q: When will a 1.00 g sample of thorium–232 have a mass of 1.00 mg, knowing that the half – life of…

A:

Q: In a 3×109 -year-old rock that originally contained some 238U , which has a half-life of 4.5×109…

A: Since 238U has a half-life of 4.5 × 109 y, it is useful for dating only very old materials, showing,…

Q: Why is uranium-235 an ideal isotope to use for nuclear technology compared to something like…

A: Nuclear reactions are employed in nuclear technology as these produce enormous amount of energy…

Q: 1. Gold-191 has a half life of 12.4 hours. What mass of this isotope would remain after 49.6 hours…

A:

Q: alpha- particles cannot pass through thick sheets of metals because?

A: Radioactive Substance emitted three type of particles, called radioactive particles , these are -…