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What is the specific activity (in Bq/g) if 8.58 μg of an isotope emits 7.4x10⁴ α particles per minute?

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A living specimen in equilibrium with the atmosphere contains one atom of 14C (half- life = 5 730 yr) for every 7.7 x 1011 stable carbon atoms. An archeological sample of wood (cellulose, C12H22011) contains 27 mg of carbon. When the sample is placed inside a shielded beta counter with 89% counting efficiency, 837 counts are accumulated in one week. Assuming that the cosmic-ray flux and the Earth's atmosphere have not changed appreciably since the sample was formed, find the age of the sample in the nearest year (1 yr ~ 3.1536 × 10' s). Take Avogadro Number to be DONT ROUND IN THE STEPS BECAUSE IT WILL NavG =6.026x1023 AFFECT YOUR ANSWER AND MAKE IT WRONG
1.5 The binding energy per nucléon for °Fe is 8.8 MeV per nucléon. Estimate the energy released per kilogram of matter by the sequence of reactions which fuse hydrogen to iron.
What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to 190 cpm in 21.0 min? Answer needs to have significant figures. I got 4.2 min as my answer but am told it is wrong.
A radioactive source of a single nuclide emits 2.4 MeV neutrons at the rate of 2400 neutrons per second. The number of atoms in the source is 8.3 × 109. The activity of the source, in nCi, is closest to: A radioactive source of a single nuclide emits 2.4 MeV neutrons at the rate of 2400 neutrons per second. The number of atoms in the source is 8.3 × 109. The activity of the source, in nCi, is closest to:.
A 73.0 kg person experiences a whole-body exposure to alpha radiation with energy of 1.50 MeVMeV. A total of 5.40×1012 alpha particles is absorbed. Use the Table of Relative biological effectiveness (RBE) for several types of radiation. A) What is the absorbed dose in rad? Express your answer in rads. B) What is the equivalent dose in rem? Express your answer in rem. C) If the source is 0.0100 g of 226Ra (half-life 1600 years) somewhere in the body, what is the activity of the source? Express your answer in decays per second. D) If all the alpha particles produced are absorbed, what time is required for this dose to be delivered? Express your answer with the appropriate units.
A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5 730 yr) for every 7.7 × 1011 stable carbon atoms. An archeological sample of wood (cellulose, C12H22O11) contains 21.0 mg of carbon. When the sample is placed inside a shielded beta counter, 837 counts are accumulated in one week. Assuming that the cosmic-ray flux and the Earth’s atmosphere have not changed appreciably since the sample was formed, find the age of the sample. ( Atomic mass of C is 12u)
Gamma rays may be used to kill pathogens in ground beef. One irradiation facility uses a 60Co source that has an activity of 1.0×10^6Ci. 60Co undergoes beta decay and then gives off two gamma rays, at 1.17 and 1.33MeV; typically 30% of this gamma-ray energy is absorbed by the meat. The dose required to kill all pathogens present in the beef is 4000Gy. How many kilograms of meat per hour can be processed in this facility? Express your answer in kilograms per h
The reaction shown below has a Q value of 13.574 MeV. H + N - C + He Determine the atomic mass (in u) of the Carbon-12 isotope. (Assume the atomic masses M2 = 2.0141 u, MN-14 = 14.0031 u, and Mued = 4.0026 u. Enter your answer to at least 3 decimal places.)
A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of 90/38 Sr is 89.9077 u.) If the building initially contained 8.6 kg of this substance and the safe level is less than 10.4 counts/min, how long will the building be unsafe? Provide answer in number of years.
(a) At an initial time, a radioactive sample has an activity of 8.77x104 Bq. After 3.88 hours the activity is 5.35x104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.88 hours? (A) (in s) OA: 6.426x103 OB: 9.317x103 oC: 1.351x104 OD: 1.959x104 OE: 2.840x104 OF: 4.119x104 OG: 5.972x104 (B) (in Bq) H: 8.660x104 OA: 1.387x104 OB: 1.845x104 OC: 2.454x104 OD: 3.264x104 OE: 4.341x104 OF: 5.773x104 OG: 7.678x104 OH: 1.021x105
Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to incandescence for long periods of time. Natural thorium is almost 100% 232Th, with a half-life of 1.405 x 10¹0 y. If an average lantern mantle contains 270 mg of thorium, what is its activity (in Bq)? XBq t
A 95 kgkg patient swallows a 33 μCiμCi beta emitter with a half-life of 5.0 days, and the radioactive nuclei are quickly distributed throughout his body. The beta particles are emitted with an average energy of 0.35 MeVMeV, 90%% of which is absorbed by the body. What dose equivalent does the patient receive in the first week?

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