HW 7 - NUCL 200 Introduction to Nuclear Engineering Spring 2008 Homework 7 Due Date Purdue University School before or at the beginning Friday of

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Unformatted text preview: NUCL 200: Introduction to Nuclear Engineering Spring 2008 Homework 7 Due Date: Purdue University, School before or at the beginning Friday, April 25, 2008 of Nuclear Engineering of the class.Introduction to Nuclear Engineering NUCL 200: No late homework accepted. Spring Semester 2009 Homework 7 H8-01 (10 pts) Name and relate various radiation units for Due Wednesday, April 29, 2009 1. (10 pts) Name andb) Exposure Rate relate various radiation units for a) Exposure c) Absorbed Dose b) Exposure Rate d) Absorbed Dose Rate c) Absorbed Dose e) Equivalent Dose d) Absorbed Dose Rate e) Equivalent Dose f) Equivalent Dose Rate f ) Equivalent Dose Rate A worker in a nuclear laboratory recieves whole-body exposure H8-02 (15 pts) 2. (15 pts) A worker hour.nuclear dose (in mrad) and dose equivalent (in mrem) 5 minutes by a thermal in a What laboratory recieves whole-body exposure for does he neutron beam at areceive? millirads per hour. What dose (in mrad) and dose equivalent (in mrem) does he rate 20 receive? H6-07 (15 pts) A small radioactive source emits gamma-rays isotropically. At 3. (15 pts) A small radioactive source emits gamma-rays isotropically. allow distance of 1 m from the source, would be 50 mrem/s. Occupational work procedures At a a maximum the dose deposited to the human would rem. Ifmrem/s. Occupational work procedures allow a maximum one-time exposure of 5 be 50 the worker needs 1 hr to complete the one-time exposure of 5assignment, what is the minimum distance from the source to work rem. If the worker needs 1 hr to complete the work assignment, what is the minimum distance from the if no shielding worker if no shielding is available? the worker source to the is available? 4. (20 pts) (a) Using mission table below,energies 140 and 511 keV through a person repre- of energies 140 and data in of -rays of calculate the percentage transmission of -rays 511 keV through a person represented by 30 cm of tissue. sented by 30 cm of tissue. (b) The person is (b) The person isastandingthick copper plate. How much would the resulting intensity be standing behind 2-mm behind a 2-mm thick copper plate. How reduced by in thismuch would the resulting intensity be reduced by in this case? case? Mass Attenuation coefficients (cm2 g-1 ) for -rays or X-rays. E (keV) 140 159 364 511 Material Density (g cm-3 ) 60 Tissue 1.0 0.20 0.15 0.15 0.11 0.097 1.8 0.32 0.16 0.15 0.10 0.090 Bone Copper 8.9 1.5 0.25 0.20 0.098 0.081 3.67 5.7 0.66 0.52 0.13 0.090 NaI(T1) H8-03 (20 pts) (a) Using data in table below, calculate the percentage transa distance of 1 m from the source, the dose deposited to the human for 5 minutes by a thermal neutron beam at a rate 20 millirads per a) Exposure 5. (20 pts) The natural abundance of deuterium (D) in all hydrogen present on Earth is 0.015 a/o. Assume that we have the technological means to produce fusion energy by fusing all deuterium in 1 liter of naturally occurring water. Estimate the total energy produced in kWh if the average energy released in two different D-D fusion pathways (D(D,p) and D(D,n)) is 3.65 MeV. 6. (20 pts) What is the energy (in kWh) that could be produced by fissioning all U-235 in 1 kg of natural uranium (assume 0.7 a/o of U-235). Compare this energy to that that potentially produced by fusion from water in the previous problem. ...
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This note was uploaded on 05/02/2009 for the course NUCL 200 taught by Professor Jovanoic during the Spring '08 term at Purdue University-West Lafayette.

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