Dose Calibrator Operation and QC

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1.  Dose calibrators detect radiation using:

        a NaI(Tl) scintillation crystal

        a liquid scintillation detector

        an ionization chamber

        a solid state Germanium detector

2.  Dose calibrators can accurately measure radioactivity levels between:

        1 mCi and 1 mCi

        100 mCi and 5 mCi

        1 mCi and 1 Ci

        1 mCi and 1 kCi

3.  According to the current NRC Regulations, all administered doses must be within " ____% of the prescribed dose:

        5

        10

        15

        20

4.  For all required QC tests on a dose calibrator, the expected and measured readings must be within:

        ± 5%

        ± 10%

        ± 15%

        ± 20%

5.     How often should a dose calibrator be checked for accuracy:

        Daily

        Monthly

        Quarterly

        Annually

6.  Is the following accuracy test a “Pass” or a “Fail”?

Standard         Energy       expected       measured
                          (keV)      value (mCi)     value (mCi)

      Co-57                 122               2.48              2.51

Cs-137               662               3.38              3.29

Co-60               1,332              1.55              1.52

  Pass

        Fail

7.   How often must a dose calibrator be checked for constancy?

        Daily

        Monthly

        Quarterly

        Annually
 

8.   Is the following constancy test a “Pass” or a “Fail”?:

Isotope            Reading (mCi)

Setting       Mon     Tues   Wed    Thu     Fri
 Cs-137      123      124     122      126    124
Ga-67        223      224     222      226    224
Tl-201        163      164     162      166    164
Tc-99m      243      244     242      246    244
I-131           313      314     312      316    314
I-123           193      194     192      196    194
In-111         283      284     282      286    284
Xe-133        433      434     432      436    434

        Pass       

        Fail

    9.    How often must a dose calibrator be checked for linearity: 

        Daily

         Monthly

         Quarterly

        Annually

10.    Is the following linearity test a “Pass” or a “Fail”?

        Elapsed             expected       measured

       time (hr)               value               value

0                      300                  300
1                      267                  230
2                      238                  201
3                      212                  135
6    (1 HL)        150                    92
12  (2 HL)        75                      36.4
24  (4 HL)        18.75                   7.5

  Pass

         Fail

11.  How often must a dose calibrator be checked for geometry?:

        Daily

        Monthly

        Quarterly

        Annually

        At Installation

12.  Is this geometry test a "pass" or a "fail"?:

Sample Volume     Activity (mCi)

 0.5 ml                          25.5    
 1.0                               25.3    
 2.0                               25.0
 3.0                               24.8 
 4.0                               24.7
 5.0                               24.5
 6.0                               24.4

        Line PA

        Line PB

13.  Which of the following radioisotopes would be the most difficult to calibrate in a dose calibrator?:

        Tc-99m

        I-123

        Y-90

        I-131

14.   Which ONE of the dose calibrator QC tests is designed to determine the reproducibility of the instrument day after day?

        Accuracy

        Constancy     

        Linearity

        Geometry
 

15.     Which one of the following procedures can be performed in the dose calibrator:

        Al3+ ion breakthrough test

        Mo-99 breakthrough test

        Counting of a wipe used for package survey

        None of the Above

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