Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
1.
|
A vial contains 100mCi of an unidentified radionuclide at 10am Thursday. At 10am
Friday, the activity has decayed to 25 mCi. What is the half-life of the unidentified
radionuclide?
a. | 12 hours | c. | 24 hours | b. | 100 hours | d. | 4 hours |
|
|
|
2.
|
If an assay of a vial containing Molybdenum shows 50 mCi present on June 1st,
approximately what will the assay show on June 24th? DF= .1256
a. | 7.88 mCi | c. | 6.28 uCi | b. | 6.28 mCi | d. | 398 mCi |
|
|
|
3.
|
At some point in time a source has an activity of 1,000 mCi. At a later point in
time the activity is 62.5 mCi. The half-life is unknown. How many half-lives have elapsed?
a. | four | c. | three | b. | can’t be determined from data
provided | d. | five |
|
|
|
4.
|
Convert 4.1 MBq to mCi:
a. | 11 mCi | c. | .11 mCi | b. | 151.7 mCi | d. | 41.1 mCi |
|
|
|
5.
|
Convert 15 mCi to MBq:
a. | .4 MBq | c. | 52 MBq | b. | 555 MBq | d. | 5550 MBq |
|
|
|
6.
|
Convert 119 Rems to Sieverts:
a. | .119 Sv | c. | 1.19 Sv | b. | 11.9 Sv | d. | 119 Sv |
|
|
|
7.
|
The Half Value Layer for I-123 in lead is .3 mm. A dose generates 5300
mR/hr. What will the exposure be for the technologist if a .90 mm slab of lead is placed
inbetween the source and the technologist?
a. | 530 mR/hr | c. | 662.5 mR/hr | b. | 662.5 mCi/hr | d. | 526 mR/hr |
|
|
|
8.
|
Convert 31 MBq to mCi:
a. | 68 mCi | c. | .837 mCi | b. | 1147 mCi | d. | 1.19 mCi |
|
|
|
9.
|
A vial of Technetium eluate contains 50 mCi/ml. If 4 mls are withdrawn and
added to a MDP Kit containing 16 mls of normal saline, what volume would then be needed to be
withdrawn to prepare a 20 mCi unit dose at that moment?
a. | 4 ml | c. | .2 ml | b. | 2.5 ml | d. | 2 ml |
|
|
|
10.
|
Convert 38 mRem to mSv:
a. | 3.8 mSv | c. | .038 mSv | b. | .38 mSv | d. | 38 mSv |
|
|
|
11.
|
Convert 8 rads to Grays:
a. | 80 Grays | c. | .08 Grays | b. | .8 Grays | d. | 8 Grays |
|
|
|
12.
|
Convert 25 mCi to MBq:
a. | 925 MBq | c. | 62 MBq | b. | 92.5 MBq | d. | 925 Bq |
|
|
|
13.
|
One-hundred twenty-seven millicuries is equivalent to how many
megabecquerels?
a. | 4,699 MBq | c. | 4.70 MBq | b. | 46.99 MBq | d. | 3.4 MBq |
|
|
|
14.
|
A reagent kit contains approximately 140 mCi of Tc99m Sulfur Colloid in 23 mls
at 9am. How much volume must be withdrawn to obtain a dose of 5 mCi at 3 pm?
a. | 1.7 ml | c. | 2.0 ml | b. | 1.64 ml | d. | 1.6 ml |
|
|
|
15.
|
100 uCi =______mCi:
|
|
|
16.
|
If the exposure rate at 10 meters from a cobalt sheet source is 15 mR/hr, what
will the exposure rate be at 25 meters?
a. | 3 mR/hr | c. | 6 mR/hr | b. | 10 mR/hr | d. | 2.4 mR/hr |
|
|
|
17.
|
If the exposure rate at 4 meters from a radioactive source is 5 mR/hr, what will
the exposure rate be at 3 meters?
a. | 6.5 mR/hr | c. | 2.8 mR/hr | b. | 8.9 mR/hr | d. | 7.4 mR/hr |
|
|
|
18.
|
Convert 9.25 MBq to mCi:
a. | 342.2 mCi | c. | .25 mCi | b. | 25 mCi | d. | 46.25 mCi |
|
|
|
19.
|
Convert 4 Rems to Sieverts:
a. | 4 Sv | c. | .04 Sv | b. | .4 Sv | d. | 40 Sv |
|
|
|
20.
|
Convert 117 rads to Gy:
a. | 11.7 Gy | c. | .117 Gy | b. | 1.17 Gy | d. | 117 Gy |
|