As a precaution, if a student exceeds what fraction of their annual dose limit in any one month, counseling is required?

As a precaution, if a student exceeds what fraction of their annual dose limit in any one month, counseling is required?

• A. 1/20th
• B. 1/5th
• C. 1/3rd
• D. 1/10th

Answer: (D)

Monthly dose monitoring helps ensure that the total annual exposure stays within safe limits and supports the ALARA principle. If a student receives more than one-tenth of their annual dose limit in a single month, counseling is required to review exposure-reduction strategies and reinforce protective practices. This 10% rule acts as an early warning before the rest of the year could push the annual limit. For example, with an annual limit of 50 mSv, more than 5 mSv in one month would trigger counseling. The other fractions would either kick in too late or too early relative to the annual limit, which is why the one-tenth threshold is used.

Monthly dose monitoring helps ensure that the total annual exposure stays within safe limits and supports the ALARA principle. If a student receives more than one-tenth of their annual dose limit in a single month, counseling is required to review exposure-reduction strategies and reinforce protective practices. This 10% rule acts as an early warning before the rest of the year could push the annual limit. For example, with an annual limit of 50 mSv, more than 5 mSv in one month would trigger counseling. The other fractions would either kick in too late or too early relative to the annual limit, which is why the one-tenth threshold is used.