Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 4, Problem 4.7P
To determine
The number of atoms in
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Calculate the mass defect (in kg) of 150Nd if it has an observed atomic mass of 149.9208 amu. The mass of a proton and a neutron are 1.0078 and 1.0087 amu, respectively.
Express your answers in three decimal places in scientific notation, i.e., 6.022e26 to represent 6.022x1020. No need to include negative sign and units.
Copper-63 has a nucleus mass of 62.92959 u. Its atomic number is 29, and its atomic mass number is 63.
The mass of a proton is 1.007276 u and the mass of a neutron is 1.008664 u
What is the total binding energy of the nucleus? Express your answer in MeV and keep 4 significant digits.
Iodine-131 is radioactive and has a half life of 8.04 days. Calculate the activity of a 7.4 mg sample of iodine-131. Give your answer in becquerels and in curies.
Be sure your answer has the correct number of significant digits.
Bq
Dci
0
x10
X
Chapter 4 Solutions
Introduction To Health Physics
Ch. 4 - Prob. 4.1PCh. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Prob. 4.4PCh. 4 - If we start with 5 mg of 210Pb , what would be the...Ch. 4 - Prob. 4.6PCh. 4 - Prob. 4.7PCh. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - For use in carcinogenesis studies, benzo(a)pyrene...
Ch. 4 - Prob. 4.11PCh. 4 - Calculate the number of beta particles emitted per...Ch. 4 - Prob. 4.13PCh. 4 - Prob. 4.14PCh. 4 - How much 234U is there in 1 metric ton of the...Ch. 4 - Prob. 4.16PCh. 4 - Prob. 4.17PCh. 4 - Prob. 4.18PCh. 4 - The mean concentration of potassium in crustal...Ch. 4 - Prob. 4.20PCh. 4 - Prob. 4.21PCh. 4 - Prob. 4.22PCh. 4 - Prob. 4.23PCh. 4 - Prob. 4.24PCh. 4 - Prob. 4.25PCh. 4 - Prob. 4.26PCh. 4 - Prob. 4.27PCh. 4 - Prob. 4.28PCh. 4 - Prob. 4.29PCh. 4 - Prob. 4.31PCh. 4 - Prob. 4.32PCh. 4 - Prob. 4.33PCh. 4 - Prob. 4.34PCh. 4 - Prob. 4.35PCh. 4 - Prob. 4.36PCh. 4 - Prob. 4.37PCh. 4 - Prob. 4.38PCh. 4 - Prob. 4.39PCh. 4 - Prob. 4.40PCh. 4 - Prob. 4.41PCh. 4 - Prob. 4.42PCh. 4 - Prob. 4.43PCh. 4 - What is the (a) half-life? (b) mean life (in...Ch. 4 - Prob. 4.45PCh. 4 - Prob. 4.46PCh. 4 - Prob. 4.47PCh. 4 - Prob. 4.48PCh. 4 - Prob. 4.49PCh. 4 - Prob. 4.53PCh. 4 - Prob. 4.54PCh. 4 - Prob. 4.55P
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- What is the dose in mSv for: (a) a 0.1 Gy xray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5 mGy of exposure?arrow_forward(a) If the average molecular mass of compounds in food is 50.0 g, how many molecules are mere in 1.00 kg at food? (b) How many ion pairs are created in 1.00 kg of food, if it is exposed to 1000 Sv and it takes 32.0 eV to create an ion pair? (c) Find the ratio of ion pairs to molecules. (d) If these ion pairs recombine into a distribution of 2000 new compounds, how many parts per billion is each?arrow_forwardThe atomic weight of cadmium is 112.41, and its density is 8.65 g/cm3. Using Figure 14.3, estimate the attenuation distance of a thermal neutron beam in cadmium. (The attenuation distance is the distance traveled after which the intensity of the beam is reduced to 1/e of its initial value, where e is the base of the natural logarithms.)arrow_forward
- 4.3 The radioactive cobalt isotope, Co, has an half-life of 63 months and undergoes decay. The molar mass of 6°Co is 59.9338222 amu. A sample initially contains 48 mg of 6°Co. (a) Calculate the number of moles of 6Co that are left in the sample after 5.0 years. (b) Calculate the activity of 60CO after 5.0 years, in units of per month (month).arrow_forwardThe charred bones of a sloth in a cave in Chile represent the earliest evidence of human presence at the southern tip of South America. A sample of the bone has a specific activity of 5.22 disintegrations per minute per gram of carbon (d/min*g). If the 12Cy14C ratio for living organisms results in a specific activity of 15.3 d/min*g, how old are the bones (t1/2 of 14C = 5730 yr)?arrow_forwardThe mass defect for potassium-40 is: -___x10-28kg. (Give your answer with 3 sig digs and do not include units) Use mass of proton = 1.007276 u mass of neutron = 1.008665 u actual mass = 39.9687 uarrow_forward
- The half-life of 231Pa is 3.25×104 years. How much of an initial 10.41 μg sample remains after 3.25×105 years?arrow_forward232Th is an alpha emitter that has a half life that is similar to the age of the universe (t1/2 = 1.405 10¹0 years). For this question, you will need to use information from the table on the last page of the exam, and also the fact that the mass of an alpha particle is 4.001506 amu, and an amu is equal to 931.5 MeV/c². (a) Write the equation for the decay of 232 Th by a single alpha particle. (b) Determine the energy (c) What percentage of the 232Th nuclei that existed when the Earth was formed 4.54 billion years ago are still around today? released in this decay.arrow_forwardWhat is the mass of 25.0 mCi of technetium-99m (Tc99m)Tc99m , which has a half-life of 6.00 h?arrow_forward
- 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 × 10¹0 y. If an average lantern mantle contains 230 mg of thorium, what is its activity (in Bq)? XBq +arrow_forwardWhat is the specific activity (in Bq/g) if 8.58 µg of an isotope emits 7.4x104 a particles per minute?arrow_forwardPlutonium-239 (atomic number 94) is a by-product of nuclear power plants. It decays via alpha and gamma decay. The half-life for the decay is 24100 years. What is the decay constant for Pu-239 expressed in inverse years and inverse seconds? If the sample of Pu-is measured to have an activity of 150 decays per second today, how many years would it take for the sample to reduce to an activity of 5 decays per second? How many Pu-239 nuclei are in the sample measured today?arrow_forward
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