The following dose calibrator constancy test results were obtained with a [tex]^{57}Co[/tex] reference source:

- [tex]^{57}Co[/tex] (measured) 56.5 µCi, (calculated) 57.8 µCi
- [tex]^{99m}Tc[/tex] (measured) 59.2 µCi, (calculated) 58.7 µCi
- [tex]^{123}I[/tex] (measured) 46.9 µCi, (calculated) 51.7 µCi
- [tex]^{201}Tl[/tex] (measured) 47.9 µCi, (calculated) 53.5 µCi

Which of the following measured values fall within the limits according to the standard of practice?

A. [tex]^{57}Co[/tex], [tex]^{99m}Tc[/tex], [tex]^{123}I[/tex], [tex]^{201}Tl[/tex]
B. [tex]^{57}Co[/tex], [tex]^{99m}Tc[/tex], [tex]^{123}I[/tex]
C. [tex]^{99m}Tc[/tex], [tex]^{123}I[/tex], [tex]^{201}Tl[/tex]
D. [tex]^{57}Co[/tex], [tex]^{99m}Tc[/tex]

The dose calibrator constancy test results for 57Co, 99mTc, and 123I fall within the standard of practice limits, considering a 10% margin. However, the result for 201Tl falls just slightly outside the acceptable range.

Explanation:

The standard of practice usually allows for a variation of 10% between measured and calculated values in a dose calibrator constancy test. Let's apply this standard to the numbers you provided:

57Co: (56.5 - 57.8) / 57.8 = -0.022, or -2.2%, which is within the acceptable range
99mTc: (59.2 - 58.7) / 58.7 = 0.0085, or 0.85%, again within the acceptable measure
123I: (46.9 - 51.7) / 51.7 = -0.092, or -9.2%, which, while close to the limit, is still ok
201Tl: (47.9 - 53.5) / 53.5 = -0.104, or -10.4%, which falls just outside the acceptable margin

So based on these calculations, the answer to which measured values fall within the limits according to the standard of practice are: 57Co, 99mTc, and 123I, giving you option b.

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