Question 21: Is it time to update Regulatory Guide 1.109
and its corresponding codes due to the updated dose
conversion factors in the revised Part 20?
Answer: Perhaps, but such an update could only be a
partial update at this time. The full updating could only
occur if and when Appendix I is recast as an effective dose
equivalent. The evaluation of whether Appendix I should be
changed is currently underway. (Reference: Regulatory
Guides)