Based on Clark's formula, how many millicuries should a 95 lb child receive if the adult dosage is 20 mCi?

Clark's formula is used to determine pediatric dosages based on the weight ratio of a child to an adult. The formula is as follows:

[ \text{Child's dose} = \left( \frac{\text{Child's weight in lbs}}{150} \right) \times \text{Adult dose} ]

In this case, the child's weight is 95 lbs, and the adult dosage is 20 mCi. Plugging these values into the formula gives:

[ \text{Child's dose} = \left( \frac{95}{150} \right) \times 20 \text{ mCi} ]

Calculating this:

1. Divide 95 by 150, which equals approximately 0.6333.

2. Multiply 0.6333 by 20 mCi, resulting in approximately 12.67 mCi.

This rounded to one decimal place results in 12.7 mCi, which corresponds to the choice identified. Thus, the correct answer is 12.7 mCi, as it accurately reflects the application of Clark's formula, ensuring the dosage is adjusted based on the child's weight relative to an adult standard. This method is vital in nuclear medicine to prevent overd