The radionuclide 49Sc has a half-life of 57.0 min.At t=0, the counting rate of a sample of it is 6000 counts/min above the general background activity, which is 30 counts/min.Without computation, determine whether the counting rate of the sample will be about equal to the background rate in 3 h, 7 h, 10 h, or a time much longer than 10 h.

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h1 (a) Calculate the…

A: Given(s): Decay constant, λ=0.0256 h-1 Require: Half-life, t12=? Fraction of sample left after,…

Q: Question 4. A synthetic radioisotope is freshly prepared in a lab that has an ac- ivity of 10.0 mCi.…

A: Given data as per question t    =   5.00 h A0  =   10.0mCi

Q: The activity of a freshly prepared radioactive sample with a half-life of 4 days is 1000 Bq. How…

A: Given : t1/2 = 4 days No = 1000 Bq N = 250 Bq

Q: The lead isotope Pb-209 decays at a rate proportional to the amount present at time t and has a…

A:

Q: A drug prepared for a patient is tagged with 4399Tc, which has a half-life of 6.05 h. The dose…

A:

Q: considered to be reduced to a safe level after 10 half-lives have elapsed. (Obviously, the initial…

A: Radioactivity from a particular radioisotope is considered to be reduced to a safe level after 10…

Q: radioactive

A:

Q: (a) Write the equation for the decay of 232 Th by a single alpha particle. (b) Determine the energy…

A: To find :  equation of decay energy released  in this decay  percentage of thorium nuclei left…

Q: what is the dose rate deposited per gram of water from alpha decay of 1mCi 226-Ra (branching ratio…

A: Activity (A ) = 1mCi = 1 x 10-3 Ci Energy per Decay, E1 = 4.78 MeV Energy per Decay E2 = 4.59 MeV…

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h. (a) Calculate the…

A: We have, disintegration constant, λ=0.0256 h-1 we have to find the half-life, a fraction of the…

Q: Bismuth-210 has a half-life of 5.01 days. The activity of a bismuth-210 sample at the start is 100…

A: Write the expression for the remaining quantity. Here, N0 represents the initial activity, t…

Q: Consider an initial amount of 708g of radioactive material with half-life h=3.2hdays. Use a…

A: Write the expression of radioactive degradation. N=N0e-t/t1/2

Q: A large power reactor that has been in operation for some months is turned off, but residual…

A: Power ( P ) = 135 MW Average energy per decay = 1.04 MeV

Q: radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the…

A: Given the activity of the radioactive source is equal to 25 mCi . The half- life of the source is…

Q: Co-60 is a strong gamma emitter that is used in radiotherapy units and must be replacedwhen its…

A: The objective of the question is to determine when the Co-60 in a radiotherapy unit will need to be…

Q: Question 6. At Canadian Light Source, a synthetie radioisotope is freshly prepared. The initial…

A: Given: The initial activity of synthetic radioisotopes is A0 = 10 mCi The activity changes after t =…

Q: 11. 252Cf decays by spontaneous fission 3.09% of the time and by alpha particle emission 96.91% of…

A: Concept used: Activity of a sample is found by decay constant times no. of atoms in given sample.

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: A radiation detector records 8700 counts in 1.00 min. Assuming that the detector records all decays,…

A: a) The required activity in Becquerel unit,

Q: The half-life of a radiotracer is 3 hr. (i) Determine the decay constant of the radiotracer, (ii)…

A: Given, half life of radio tracker is, t12= 3hr i) So decay constant is,  λ = ln2t12=ln23hr=0.23 hr-1…

Q: 40.12 A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a…

A: Let N denote the number of atoms of the radioactive substance A. Let t1/2 denote the half-life time…

Q: You do Brachytherapy using 130 capsules filled with 137Cs with a half-life of 30.2y that emits 662…

A:

Q: An 85 kg radiation worker accidently ingest 1.0 mg of Po211. Assume that Po211 resides in the body…

A: The half life of Po211 is T1/2 =0.516 seconds, so the decay constant λ is given by,…

Q: U235 has a decay constant of 3.138 × 10-17 s-1. Activity of 1 ug of the sample will be 80.386×10-3…

A: Unstable nuclei become stable by radiating energy. This process is called radioactivity. The rate at…

Q: A radioisotope was injected in the human body. The half-life of the radioisotope is T/2 = %3D 6…

A: Given: T1/2=6 hours

Q: Calculate the activity due to 14C in 1.00 kg of carbon found in a living organism. Express the…

A: The formula of activity is,

Q: A radioisotope has a half-life of 5.00min and an initial decay rate of 8000 Bq. (1.) What will be…

A:

Q: A synthetic radioisotope is freshly prepared in a lab that has an activity of 10.0 mCi. If the…

A:

Q: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A: Half life of C-14  T1/2= yearsinitial activity of sample A0= BqActivity of sample At = Bq

Q: Calculate the nuclear binding energy per nucleon (in J/nucleon) for the nuclei 171X with a mass…

A:

Q: What time interval elapses while 51.0% of the radioactivity of a sample of 7233As disappears, as…

A: As per given data, 51% of the radioactivity of a sample disappears.

Q: The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A:

Q: 131I is a Beta - emitter used as a tracer for radioimmunoassay in biological systems. (a) Write the…

A:

Q: A radioactive substance initially contains 20000 thorium Th230 isotype. How many of this radioactive…

A:

Q: an life of 7.2 days ay. Subsequently,

A: In general the radioactive elements decay into another radioactive element.  The first one is called…

Q: A 228Th source is labeled 1.50 mCi, but its present activity is found to be 3.47 ✕ 106 Bq.   (a)What…

A:

Q: A small region of a cancer patient’s brain is exposed for 24.0 min to 475 Bq of radioactivity from…

A: Given: To find the dose in rads with the given values as,

Q: (a) What is the mfp of 0.0253eV neutrons in Zr? For Zr: A=55.8, p=6.5 g/cm³, σ₁-8b, σa=0.18b (b) To…

A: Given, For Zr, A=55.8ρ=6.5g/cm3σs=8bσa=0.18b n=ρNAAn=6.5×6.023×102355.8n=0.702×1023 1 barn=10-24cm2…

Q: An aluminum foil of thickness 0.30 mm is bombarded by energetic neutrons. The aluminum nuclei…

A:

Q: Iodine-125 (¹251) is used to treat, among other things, brain tumors and prostate cancer. It decays…

A:

Q: The half-life of 222Rn is 3.82 days. (a) Convert the half-life to seconds. (b) Calculate the decay…

A: A radioisotope's half-life is the amount of time it takes for half of its population of atoms to…

Q: 11. 252Cf decays by spontaneous fission 3.09% of the time and by alpha particle emission 96.91% of…

A: Concept used: Activity of a sample is found by decay constant times no. of atoms in given sample.

Q: Assuming the only heat generated is via fission itself, and that 207.1 MeV of energy is recoverable…

A: Given data, Power capacity of the nuclear reactor = 1 MW Energy released per decay reaction = 207.1…

Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.