What information is required on the label of radioactive materials besides the radiation symbol?

The correct answer identifies that the label of radioactive materials must include both the calibration time and the expiration time. This requirement ensures that anyone handling or using the radioactive material is aware of the time frame during which the material remains effective and safe to use. The calibration time indicates when the radioactive source was last calibrated for accurate dosage, which is critical for safety and effective usage. The expiration time signifies when the material may no longer be reliable or could potentially pose a risk, as the radioactivity can change over time.

In the context of handling radioactive materials, maintaining accurate records of these time points is essential for regulatory compliance and ensuring safety protocols are adhered to. Proper labeling helps prevent misuse or unintended exposure, which is a vital aspect of working with such hazardous materials.

Other options do not provide the necessary safety and usage information that is required by regulations. For instance, while the chemical name and manufacturer's name are important in identifying the product, they do not address the critical aspects regarding the timing of its application. Similarly, although storage instructions are necessary for maintaining the integrity of the material, they do not cover the essential time-related information that specifically impacts its safe and effective use. Thus, including the calibration and expiration times is crucial for ensuring that those who utilize the