STRONTIUM-90 DECAY RECORDS

A licensee must maintain a record of the activity of a strontium-90 source required under part 4731.4456 for the life of the source. The record must include: A. the date and initial activity of the source as determined under part 4731.4455 ; and B. for each decay calculation, the date and the source activity as determined under part 4731.4456 .