Units of Radioactivity and Units of Radiation Absorbed Dose

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Test: Units of Radioactivity and Units of Radiation Absorbed Dose

1.  Which of the following is/are equivalent to 1 mCi?:

        3.7 x 107 Bq

        3.7 x 107 dis/sec

        3.7 x 107 dis/min

        a and b only

2.  Detector efficiency is defined as ...:

        count rate             x  100%
             disintegration rate

        disintegration rate             x  100%
                    count rate

        disintegration rate  x  count rate
                                 100%

        None of the above

3.  A 57Co standard has a disintegration rate of 3.7 x 107 Bq. What is disintegration rate in disintegrations/sec?:

        3.7 x 104

        3.7 x 107

        3.7 x 1010

        3.7 x 1013

4.   A sample measures 100 mCi in a dose calibrator. How many GBq does this activity represent..:

        0.37

        3.7      

        37.0

        370

5.     Which of the following relationships is/are correct? (read all choices!)...:

        1 Rem = 100 Sv

        1 Sv = 100 Rems

        1 Rad = 100 Gy

        1 Gy = 100 Rads

        a and c only

        b and d only

6.   Which ONE of the following statements is TRUE? :

        There are 100 MBq in a TBq

        There are 10 TBq in a GBq

        A Bq is 1/1000 the activity of a MBq

        There are 1,000,000 MBq in a TBq
         

7.   If a detector is 50% efficient, how many counts/sec should be detected for a 10 mCi standard? :

        3.7 x 107

        3.7 x 108

        1.85 x 107

        1.85 x 108
 

8.   Which of the following units does NOT represent an example of specific activity? (read all choices!)?:

        mCi/mg

        kCi/mmole

        cpm/mmole

        dps/g

        none of the above

9.    The Quality Factors for gamma rays, neutrons, and alpha particles, respectively are: 

        1,2,3

         1,2,5

         1,5,10

        1,5,20

10.    Occupationally exposed individuals have an annual MPD to the lens of the eyes of 15 Rem. What is this absorbed dose in mSv?: 

        1.5

         15

         150

        1500

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