Homework Answers
HVL means Half-value layer. It is the thickness of the material (here lead) at which the intensity of the radiation drops to half of its initial value. Dose rate is directly proportional to the intensity of the radiation. One 2cm thick lead shield can be considered as four 5mm lead shields put together. Each 5mm shield reduces the dose rate by half that is by a factor of 2. Therefore total reduction in dose rate is by a factor of 24 = 16. Therefore the answer is D. 16.
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Q9. A 2cm thick lead shield is used to reduce the dose rate from a radioactive...
The intensity of an unshielded I-131 source is 32mR/hr. If the source is put into a lead shield 3...
The intensity of an unshielded I-131 source is 32mR/hr. If the source is put into a lead shield 30mm thick what would be the intensity on the outside of the shield? Assume your distance from the source has not changed. The HVL of lead for I-131 is 0.178cm. A technician is in an area for 10 minutes and the reading on an exposure meter is 5mR/hr. Determine the actual radiation dose received by the technician. The technician should not receive...
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6) 0.45 e/hr doo.is rhr 2. An individual with a 20 gram thyroid has an up...
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For thick spheres, a y factor is used to determine thickness, t, if P is known....
For thick spheres, a y factor is used to determine thickness,
t, if P is known. The equations are:
Where: t=minimum
required thickness of sphere (inch); R=inside diameter of sphere
(inch); S=allowable stress (lbf/in2); E=joint efficiency (%);
P=allowable pressure. Assuming S=14,000 lbf/in2, P=3000 psi and
E=100%, the thickness of a sphere with a 10 inch inside diameter to
be used with a 3000 psi allowable pressure is
.
8/16
inch
b.
5/7
inch
c. 9/16
inch
d. 7/15
inch...
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The isotope lodine-131 is a radioactive isotope used in industrial and medical applications. It is prepared...
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answer is highlighed please show steps to get it 10. Iodine-131 is a radioactive isotope used...
answer is highlighed please show steps to get it
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please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How...
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Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast. Use the radioactive decay curve of iridium-192 to answer the three questions. 100 . 90 - 80 20 Sample remaining (5) SO 30 10 0...
For thick spheres, a y factor is used to determine thickness,
t, if P is known. The equations are:
Where: t=minimum
required thickness of sphere (inch); R=inside diameter of sphere
(inch); S=allowable stress (lbf/in2); E=joint efficiency (%);
P=allowable pressure. Assuming S=14,000 lbf/in2, P=3000 psi and
E=100%, the thickness of a sphere with a 10 inch inside diameter to
be used with a 3000 psi allowable pressure is
.
8/16
inch
b.
5/7
inch
c. 9/16
inch
d. 7/15
inch...
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The isotope lodine-131 is a radioactive isotope used in industrial and medical applications. It is prepared just before use because it decays rapidly through beta emission. Use the data in the table below to answer the following questions (a) Write the reaction equation. (Note m indicates an excited state of the isotope, which is generally denoted with an asterisks after the symbol, such as X*) (b) What is the rate constant for the decay? Show how you obtained this rate...
answer is highlighed please show steps to get it
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