1. Polonium-209, an α emitter, has a half-life of 102 years.
How many α particles are emitted in 1.5 s from a 1.2 ng sample of 209Po?
2. A 1.0 mg sample of 126Sn decays initially at a rate of 4.6×105 disintegrations/s.
What is the half-life of 126Sn in years?
1. Polonium-209, an α emitter, has a half-life of 102 years. How many α particles are...
Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 5.00 mg will remain after 8.00 years?
Cesium- 137, a beta emitter, has a half-life of 30y. - How many grams of a 16g sample of Cesium- 137 would remain after 90y. - How many years will be needed for a 28g of Cesium- 137 to devay to 3.5 g of Cesium- 137.
Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U.235 sample decay A. 7.08 105 yr B. 1.0 x 106 yr C. 4.7 x 10º yr D.4.9 x 109 yr * E. 7.08 109 yr
A 95 kg patient swallows a 34 ?Ci beta emitter whose half-life is 5.0 days and whose RBE is 1.6. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body. You are a health care worker needing to find the patient's dose equivalent after one week. These series of steps will help you find that dose equivalent. In all questions, assume the radioactive nuclei are distributed throughout the patient's body...
life it i Assuming that each atom that decays emits one a pha particle, how many alpha particles are emitted per minute by a and the mass of a 146Sm atom is 145.913 u 0 436-g sample of Sm ha s rom its mis a products he a alpha particles min1 life it i Assuming that each atom that decays emits one a pha particle, how many alpha particles are emitted per minute by a and the mass of a...
Assuming that each atom that decays emits one alpha particle, how many alpha particles are emitted per minute by a 0.00304-g sample of 226Ra that is free from its decay products? The half-life of 226Ra is 1.60×103 y and the mass of a 226Ra atom is 226.025 u.
1. If hydrogen-3 has a half-life of 12.3 years, how many years will it take for 109.9 mg 3H to decay to 0.013 mg 3H?
1.) What is the missing particle? 2.) Carbon-14 decays by beta emission and has a half-life of 5,730 years a.) Write the balanced equation for this reaction. b.) What percentage of a sample remains after 3,310 years? 3.) Bismuth-214 is an a-emitter with a half-life of 19.7 min. How long does it take for 75.0% of to decay?
The half-life for the radioactive decay of C-14 is 5730 years. How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay. If a sample of C-14 initially contains 1.5 mmol of C-14, how many mmols will be left after 2255 years.
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...