The isotope 2712Mg has a half-life of 9.46 min. Determine the time interval (in min) required for the activity of a sample of this isotope to decrease to 37.0% of its original value. min
Q: Cesium-137 is radioactive and has a half life of 30. years. Calculate the activity of a 1.4 mg…
A: Given value--- half life time = 30 year . mass = 1.4 mg. We have to find--- Calculate the…
Q: After 1.82 days, the activity of a sample of an unknown type radioactive material has decreased to…
A:
Q: A radioactive isotope has a half-life of 72.0 min . A sample is prepared that has an initial…
A: (a) Initial radioactive nuclei
Q: An 1 g sample of a radioactive element takes 83.92 million years to reduce into 1 µg. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: Sodium-24 is a radioisotope used for examining circulation. a. Write a balanced nuclear equation for…
A: The radioactivity equation is N = No12n where, No is the initial number of atoms, N is the atoms…
Q: The radioactive isotope 243 Am, with a half-life of 432 y, is the active element in many smoke…
A:
Q: A sample of a radioactive isotope with a decay constant of λ = 4.27 × 10-3 s-1. A sample of the…
A: we know activity R =λN where λ = decay constant N = number of particle given N = 2.68 × 1015…
Q: radiation lab orders 64 Ci of P-32. After 42.9 days the activity of the sample is 8.0 Ci. What is…
A:
Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…
A:
Q: The isotope 208Tl undergoes β decay with a half-life of 3.1 min. How many minutes will it take for…
A:
Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 60.2 h?
A:
Q: What is the half-life in days of a radioactive sample with 3.0x1015 atoms and an activity of 6.2x108…
A: In this problem, we are given the number of atoms in a radioactive sample (N = 3.0x10^15 atoms) and…
Q: A force F of magnitude 920 lb is applied to point C of the bar AB as shown. Determine both the x-y…
A: A force F of magnitude 920 lb is applied to point C of the bar AB as shown in the figure. We need to…
Q: A sealed box containing alloys of metal A and Metal B consisting of the same parts accordingly.…
A: We need to find the age of the alloy based on the given information.
Q: 10. The radioactive isotope (82Sr) has a half-life of 25.4 days. A sample containing this isotope…
A: Given, The half-life of radioactive elements is 25.4 days The initial activity, R=4.50×108 Bq
Q: Iodine-131, a beta emitter, has a half-life of 8 days. A 2-gram sample of initially pure iodine-131…
A:
Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.92-kg…
A: The initial activity of the sample can be obtained as R0=0.92×103 g15.0 decays/min11g=1.38×104/min
Q: A patient with thyroid cancer is given a sample of lodine-131 which has a half-life of 8 days. If…
A:
Q: The half-life for the a decay of uranium 2U is 4.47 x 10° yr. Determine the age (in years) of a rock…
A:
Q: unlabeled container of radioactive material has an activity of 78 decays/min. Four days later the…
A:
Q: Question 1. Tritium has a a tritium sample will remain (a) after 5.00 yr?
A: GivenHalf Life for Tritium, t1/2=12.33 years
Q: A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in…
A:
Step by step
Solved in 2 steps with 1 images
- After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to 82.2% of the initial activity. What is the half-life of this material? days Need Help? Read ItBarium-133 is a radioactive element used in certain medical procedures. A sample of pure Barium133 has a mass of 18.000 grams. Determine the activity of the sample 47 years after it was created, in units of Curies.An unstable isotope of cobalt, 60Co, has one more neutron in its nucleus than the stable 59Co and is a beta emitter with a half-life of 5.30 years. This isotope is widely used in medicine. A certain radiation source in a hospital contains 4.20×10−2g of 60Co A) What is the decay constant for that isotope? Express your answer with the appropriate units. B) How many atoms are in the source? C) How many decays occur per second? Express your answer as a number of decays per second. D) What is the activity of the source, in curies? Express your answer in curies.
- 11. A 60 kg person accidentally ingests a small source of alpha particles (RBE=15). The activity of the source is 0.04 Ci, the half life of the source is 110 years, and each alpha particle emitted has an energy of 0.586MEV. It takes 12 hours for the alpha source to pass through the persons digestive system and exit the body. (a) How many alpha particles are absorbed by the person (you may assume that 100% of the alpha particles emitted by the source are absorbed by the person)? (b) How much energy is deposited in the person by the source (in J)? (c) What is the absorbed dose (in rad)? (d) What is the absorbed dose (in rem)?1. A person with lymphoma recieves a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. a. How much energy is absorbed by the cancerous tissue? b. If the treatment consist of five 15 minutes session per week over the course of 5 weeks and just one percent of the gamma Ray beam are absorbed, what is the power of the gamma ray beam? c. If the gamma ray beam consist of just 0.5 percent of the photons emitted by the gamma source each of which has an energy of 0.3MeV, what is the activity in curies of the gamma ray source?11. Radium-226, 226Ra, undergoes an alpha decay. The current sample of Radium-226 has an initial activity of 5.50 × 101º Bq. (a) Identify the daughter nucleus by name, nucleon number, atomic number and neutron number. (b) What is the decay constant? (c) How many radioactive nuclei were initially present in the sample? (d) How long will it take the sample to reach an activity of 5.00 x 1010 Bq?