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Physics Ch 15 Brachytherapy Test 4/12
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The time period in which the activity decays to one half the original value:
Half-life
The average lifetime for the decay of radioactive atoms:
Mean life
What is the half-life of Radium 226?
1622 years
What is the half-life of Cobalt 60?
5.27 years
What is the half-life of Cesium 137?
30.0 years
What is the half-life of Iridium 192?
73.83 days
What is the half-life of Iodine 125?
59.4 days
What is the half-life of Palladium 103?
16.99 days
What is the half-life of Gold 198?
2.7 days
What is the half-life of Radon 222?
3.82 days
Radium 226 decays mainly by ________ _______.
Alpha Emission
(decays to stable lead)
What is the half-life equation that shows its relationship with the decay constant:
The relationship between activity and half-life is _________ proportional.
Inversely
It is assumed that 1 mg of Radium will have an activity of:
1 mCi
Sources that have the same concentration of radioactivity throughout their active length are called:
Uniform sources
Radium 226 is part of a long decay chain that begins with ________ and concludes with________.
Natural Uranium
Stable Lead
Most brachytherapy procedures were developed using _________.
Radium 226
The activity per unit of mass of a radioactive material (C/g):
Specific Activity
-dictates the total activity that a small source can have.
The thickness of the source capsule is known as:
the Filtration
A source which is heavily loaded with activity at one end:
The Indian Club Source
A source which has heavy loading at both ends with lighter activity concentration in the middle:
Dumbbell Source
Which isotope has largely replaced radium as the primary isotope for brachytherapy of the uterus and cervix?
Cesium 137
Which isotope is a popular replacement for Radon 222 in permanent implants and has a very short half-life 2.7 days?
Gold 198
What was the first radioisotope to be identified and isolated?
Radium 226
When using both tandem and ovoids in a gynecological implant, the typical resultant dose distribution has the shape of a:
Pear
What describes the fraction of the number of atoms that decay per unit time?
The decay constant
λ
Radium sources are leak tested to check for:
Radon 222
The most commonly used permanent implant isotopes are:
Iodine 125
Gold 198
Isotopes with a shorter half life are more likely to be used as __________ implants.
Temporary
Isotopes with a longer half life are more likely to be used as __________ implants.
Permanent
Author
RadiationTherapy
ID
207482
Card Set
Physics Ch 15 Brachytherapy Test 4/12
Description
Physics Ch 15: Aspects of Brachytherapy Test 4/12
Updated
2013-11-19T03:11:36Z
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