Answer :
Final answer:
A decay factor can be used to calibrate a unit dose instead of measuring the dosage in a dose calibrator only if the dosage was not altered after its preparation and calibration. This is to assure accuracy in the administered dosage.
option B: only if a unit dosage was not manipulated after preparation and calibration.
Explanation:
A decay factor can be used to calibrate a unit dose in place of measuring the dosage in a dose calibrator in specific circumstances. The correct answer to your question is option B: only if a unit dosage was not manipulated after preparation and calibration. This is because once a unit dosage has been manipulated, its radioactive decay might have altered and it needs to be recalibrated using a dose calibrator to ensure accurate dosage administration. The decay factor can be used to track how a stable unit dose's activity changes over time due to radioactive decay. Factors like presence of specific substances like 99mTc or the dosage containing less than 1 mCi activity do not influence the use of the decay factor per se.
option B: only if a unit dosage was not manipulated after preparation and calibration
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