Wis. Admin. Code § DHS 157.43
(1) Labeling requirements. A licensee may not use a source changer or a container to store radioactive material unless the source changer or the storage container has securely attached to it a durable, legible and clearly visible label bearing the standard trefoil radiation caution symbol with conventional colors, which is magenta, purple or black on a yellow background, having a minimum diameter of 25 millimeters and the wording:
CAUTION (or DANGER)
RADIOACTIVE MATERIAL
NOTIFY CIVIL AUTHORITIES
[or “NAME OF COMPANY”]
(2) Transport.
History: CR 01-108: cr. Register July 2002 No. 559, eff. 8-1-02; CR 16-078: r. (2) (b), renum. (2) (intro.), (a) to (2) (a), (b) Register January 2018 No. 745, eff. 2-1-18.