U.S. Nuclear Regulatory Commission
Question 425: It appears that some of the oral ingestion
ALIs in Appendix B of 10 CFR 20 are sometimes associated
with the wrong chemical forms; is this the case?
Answer: No. See the answer to Question 71 in section 10
CFR Part 20, Appendix B which indicates that the "Class"
column of 10 CFR Appendix B applies to inhalation only; it
does not refer to ingestion. In other words, neither the
D, W, and Y classes nor the chemical forms (compounds) in
the "Class" column refer to the ingestion ALIs.
(Reference: 10 CFR 20 Appendix B).