40. Consider a homogeneous mixture composed of graphite and uranium with 1.5% enrichment What is the optimum moderator-to-fuel ratio that yields the largest arde of Koo at room temperature? Ignore 234U and assume e = 1.
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- A solution of In-111 DTPA from the Amersham Corp. in Great Britain arrives in your department with the following calibration data: Activity Volume Date Time 10.0 MBq 0.20 mL Oct. 15 1200 PST Look up the half-life of In-111 in your textbook or the Chart of the Nuclides. How many mCi are in the vial on Oct. 12 at 0900 PST? The total volume of the solution is 0.20 mL. What is its concentration in mCi/mL on Oct. 12 at 0900 PST?A sealed box containing alloys of metal A and Metal B consisting of the same parts accordingly. Heavy metals A and B. These metals are radioactive with half-lives of 12 years and 18 years, respectively. When the box was opened it contained 0.53 kg A and 2.20 kg B. If radioactive metal A is known to be Radon-222, determine the radiactive activity in Curie.5. The capture cross section of 5°Co for thermal neutrons is 37 b. (а) 5°CO (p = 8.9 x 10° kg.m³ ) ? What percentage of a beam of thermal neutrons will penetrate a 1 mm sheet of (b) What is the mean free path of thermal neutrons in 'Co ?
- 2. 33As disintegrates to 32Ge in 68% of the cases, and to 34Se otherwise. T₁ for the 2 parent atoms is 17.9 d. a. What is the decay constant for 33 As? b. What is the activity of a source containing 2.0 × 10¹7 atoms of 33 As? Express in becquerels and in curies.A 250 mg sample at 228 Ac has an activity of 207 * 10 ^ 16 atoms per second. What is the half life?a) The ionic radius of lead is 0.180 nm. What fraction of this volume does the nucleus take up for lead-208? b) What is the binding energy per nucleon for lead- 208?
- If the half-life of actinium-227 is 21.8 years, approximately how much time will be required to reduce a 1.00–kg sample to about 1.00 g? years(a) Estimate the years that the deuterium fuel in the oceans could supply the energy needs of the world. Assume world energy consumption to be ten times that of the United States which is 8×1019 J/y and that the deuterium in the oceans could be converted to energy with an efficiency of 32%. You must estimate or look up the amount of water in the oceans and take the deuterium content to be 0.015% of natural hydrogen to find the mass of deuterium available. Note that approximate energy yield of deuterium is 3.37×1014 J/kg. (b) Comment on how much time this is by any human measure. (It is not an unreasonable result, only an impressive one.)A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The Sr is 89.9077 u.) If the building initially contained 7.7 kg of this substance and the safe level is less than 90 38 atomic mass of 10.3 counts/min, how long will the building be unsafe? yr
- 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.5 Answer the following questions: a) For a homogeneous nucleation process, sketch the dependence of the surface and bulk free energies on the radius of a spherical embryo using the equation below. kT AG, = 4rv*y -* inS V, AG > r b) Sketch the dependence of the free energy changes (AG,) on the radius of a spherical embryo when the supersaturation ratio (S) is greater than 1, equal to 1 and less than 1. AG c) Discuss the importance of supersaturation on precipitationYttrium-87 has a rate constant of 2.6x10^-6 s^-1. What is the activity of a 780-mg sample in Bq?