Americium-241 is a radioactive isotope that emits alpha particles. The rate constant for this radioactive decay...
Americium-241 is a radioactive isotope that emits alpha particles. The rate constant for this radioactive decay is 1.47 x 10-3 per year.
a. What is the half-life for the decay of americium-241?
b. How long will it take for 45.0% of the americium to decay?
Homework Answers
All radioactive decay processes follows first order kinetics.
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Americium-241 is a radioactive isotope that emits alpha
particles. The rate constant for this radioactive decay...
Americium-241 (mass 241.056823 u) decays via alpha decay (alpha particles mass: 4.002602 u) into Neptunium-237 (mass...
Americium-241 (mass 241.056823 u) decays via alpha decay (alpha particles mass: 4.002602 u) into Neptunium-237 (mass 237.04181734 u) at a rate of 1 decay per second per particles. How much power is generated by the spontoneous decay of 1 kg Am-241?.
Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...
Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 44.0 % of an Am-241 sample to decay?
Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of...
Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 32.0 % of an Am-241 sample to decay? Express your answer numerically in years.
The rate constant for the decay of a radioactive isotope is 4.226 x 10-3/day. What is...
The rate constant for the decay of a radioactive isotope is 4.226 x 10-3/day. What is the half-life of of this isotope? 328.0 days O 410.0 days O 82.00 days O 164.0 days O none of these
Part VI: Apply Your Knowledge Many smoke detectors contain a small amount of the isotope Americium-241,...
Part VI: Apply Your Knowledge Many smoke detectors contain a small amount of the isotope Americium-241, which emits alpha radiation. Should a person walking under such a smoke detector be concerned about being hit by the alpha particles? Explain your answer using something you learned in this lab. In the medical imaging procedure known as a PET scan (Positron Emission Tomography), positrons from a radioactive tracer strike electrons in the body's tissues. This produces radiation, and this radiation is then...
14C is a radioactive isotope with a half life of 5.73x10^3 years. Radioactive decay is first...
14C is a radioactive isotope with a half life of 5.73x10^3 years. Radioactive decay is first order process and the amount of 14C present in an object can be used to determine its age. How long does it take for for 90 % of the 14C in a sample to decompose?
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving...
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...
A) You are using a Geiger counter to measure the activity of a radioactive substance over...
A) You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 48.2 minutes , what is the half-life of this substance? B) An unknown radioactive substance has a half-life of 3.20 hours . If 24.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago? C) Americium-241 is used in some smoke detectors....
The isotope 241 95 Am is an alpha-particle emitter with a half-life of 432 years. (c) The activity of the 241 95 Am in a...
The isotope 241 95 Am is an alpha-particle emitter with a half-life of 432 years. (c) The activity of the 241 95 Am in a smoke detector is 1 µCi. How long will it take for the activity to drop to 0.9 µCi? (d) How many atoms of 241 95 Am have transmuted during the time for the activity to drop to 0.9 µCi? (e) Calculate the Q value in MeV for this α−decay of 241 95 Am. (f) Calculate...
The natural radioactive decay of 235U is by Alpha emission with a half-life of 704 Million...
The natural radioactive decay of 235U is by Alpha emission with a half-life of 704 Million years. Remember that an Alpha particle consists of two protons and two neutrons. What is the radiogenic daughter isotope produced by this decay? 231U 231Th 235Th 238U 206Pb 2. The half-life for the decay of 222Rn gas is about 3.8 days. If we started with one mole of 222Rn gas, how many days (to the nearest 1/10th of a day) would it take until...
The rate constant for the decay of a radioactive isotope is 4.226 x 10-3/day. What is the half-life of of this isotope? 328.0 days O 410.0 days O 82.00 days O 164.0 days O none of these
Part VI: Apply Your Knowledge Many smoke detectors contain a small amount of the isotope Americium-241, which emits alpha radiation. Should a person walking under such a smoke detector be concerned about being hit by the alpha particles? Explain your answer using something you learned in this lab. In the medical imaging procedure known as a PET scan (Positron Emission Tomography), positrons from a radioactive tracer strike electrons in the body's tissues. This produces radiation, and this radiation is then...
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...
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