Iodine-131 is a beta-emitter, which decay by the first-order rate law with a half-life of 8.0 days. What is the activity in cps (counts per second) of 25.0 ng (2.5 x 10–8 g) sample of 131I (atomic mass = 131 g/mol)? (Avogadro’s #, NA = 6.02 x 1023/mol) (A) 1.2 x 108 cps           (B) 1.5 x 1010 cps           (C) 1.0 x 1011 cps           (D) 4.1 x 1011 cps

Q: A drug tagged with 4399Tc (half - life = 6.05 h) is prepared for a patient. If the original activity…

A: Formula to calculate the activity of the drug after 2.0 h is,

Q: For the real or imaginary nucleus of 19276X, find (a) the net electrical charge of the nucleus, (b)…

A: Here given the real or imaginary nucleus of ¹⁹²₇₆X . We have to calculate the net electrical charge…

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

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

A: Given data: Time t=24 min =1440seconds Emission rate =475 Bq Amount of dose =1.858g=0.001 Energy E=…

Q: How much is the mass of the sample in grams of Po-218 that has an activity of 5.00 x 1019 Bq? The…

A: Given Activity = rate of disintegration = 5 × 1019 Bq = 5 × 1019 disintegration/second Half life =…

Q: A 5,560 Ci 60 Co source used for cancer therapy is considered too weak to be useful when its…

A: Given, The activity of  C60o used for cancer therapy = 5,560 Ci = R0 The reduced activity of C60o…

Q: radiation detector which registers 11360 counts per minute. Twelve hours later, the detector reads…

A:

Q: 4. When we have a single measurement x, then it represents A) The mean only B) The predicted…

A: Note: As per the guidelines, we can only answer first question of multiple question. Sorry for the…

Q: A sample of silver contains 5.00 micrograms of Ag-105.  Determine the activity of the sample in…

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Q: Radioactive indium-111 has an effective half-life of 2.5 days.If a dose with an activity of 3.0 mCi…

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Q: The half-life of americium-241 is 457 years. What is the activity in curies of a 0.010g of sample of…

A: Half life of americium 241  t1/2 = 457 years Mass of sample m = 0.010 g Molar mass of americium -241…

Q: In terms of biological damage, how many rad of heavy ions are equivalent to 100 rad of x - rays?

A: Write the expression for the biological damage caused by the X-rays with a quality factor of 1.

Q: (1) Half life of carbon 14 is approximately (a) 5912 years (b) 6912 years (c) 3172 years (d) 5715…

A: Part (i) The carbon 14 half-life is approx. 5715 years.

Q: Which of the following radioactive doses would deliver the most energy to a patient? Dose A delivers…

A: Given;- A delivers 6 mrad with an RBE of 3, dose B delivers 9 mrad with an RBE of 2, and dose C…

Q: What is the dose in mSv for: (a) a 0.1 Gy x-ray?(b) 2.5 mGy of neutron exposure to the eye? (c) 1.5…

A: The dose in Sv is given by, a) The energy radiation for X-ray is 1RBE. Thus,

Q: Two nuclei have mass numbers in the ratio 2 : 5. What is the ratio of their nuclear densities?

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Q: Find the activity of a sample containing 4.72 x 10-6 g of 60/27Co (T1/2 = 5.27 years)

A:

Q: a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have…

A:

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

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Q: A reactor is developing nuclear energy at a rate of 32000 kW. How many atoms of Uranium U235 undergo…

A:

Q: Explain why 231-Th-90 is likely to be a beta minus emitter

A: Why 231-Th-90 is likely to be a beta minus emitter.

Q: How many kilograms of water are needed to obtain the198.8 mol of deuterium, assuming that deuterium…

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Q: In one year, a man working with radioactive materials receives a dose of 7.8 mGy to his lungs from…

A: (a) The equivalent dose absorbed by lungs from alpha radiation can be determined as, Here, HL, Wα…

Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…

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Q: 5. The capture cross section ơ̟ of >ºCo for thermal neutrons is 37 b. (а) 5°CO (p = 8.9 x 10° kg.m3)…

A:

Q: Carbon 14 activity of 130 gram sample of wood. Bq is 2.22. How old is sample in years?

A: The original activity of wood is 13.6 counts per minute. Thus, initial activity is, A0=13.660130…

Q: Stars produce by fusion of 4 protons (1H atoms) into 4He and 2 positrons, Beta+. positive electrons…

A: The mass defect in a nuclear reaction is the difference in the mass of the reactants from mass of…

Q: 53.0 kgkg laboratory worker is exposed to 26.0 mJmJ of beta radiation with RBE = 1.5. What is the…

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Q: What is AG° for freezing 30 g of water at 5°C? The enthalpy of fusion for water is 333.55 J/g.…

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Q: What is the approximate radius of a nitrogen nucleus that has seven protons and seven neutrons?

A: Given : Number of protons (P) = 7 Number of neutrons (N) = 7

Q: It is estimated that the total explosive yield of all the nuclear bombs in existence currently is…

A: Given- The amount of energy =4,000 MT (a)  Convert this amount of energy to kilowatt-hours We have 1…

Q: Find the activity of a sample containing 1.63 10-6 g of (60/27)Co (T1/2 = 5.27 years).

A:

Q: A patient swallows a radiopharmaceutical tagged with phosphorus-32 (P), a ߯ emitter with a…

A: Formula to calculate the number of electrons emitted is,

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 101º Bq 1. Nuclear decay law: N…

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Q: 3.  If a sample emits 2000 counts per second when the detector is 1 meter from the sample, how many…

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Q: The range of a beta particle with IMEV energy in aluminum if its density is 2.698 gm/cm3 and it has…

A: In this question we have to find the range of a beta particle. Please give positive feedback if the…

Q: The body of a stone-age man was found in a glacier in 1997. The body was dated using radiocarbon…

A: Given   Half period , t(1/2) = 5840 years  Initial activity , Ro = 0.25 Bq  Final activity , R =…

Q: In a diagnostic x-ray procedure, 5.25×1010 photons are absorbed by tissue with a mass of 0.590 kg.…

A:

Q: Find the activity of a sample containing 6.92 x10-6 g of  (T1/2 = 5.27 years).

A: Total sample,N=6.92*10-6 g. T½=5.27 years.

Q: radiopharmaceutical is labeled with an activity of 480 mCi on April 1 at 6:00am. What is the…

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Q: In a certain town, the average yearly background radiation consists of 27.7 mrad of X-rays and γ…

A: The relation between dose in rem in terms of dose in rad is:

Rutherford's scattering experiment

Rutherford’s scattering experiment is also known as the gold foil experiment. This experiment disproved the plum pudding model of J.J. Thomson. In a gold foil experiment, high-energy alpha particles are made to strike a thin gold foil. The scattered alpha particles are detected using a detector. This experiment showed that the positive charge of the atom is at the center. Most of the atom’s mass is also confined to a small volume at the center. This region is known as the nucleus of the atom.