Detailed description
The employment of employees in a third-party facility with X-ray equipment or interference sources without the required display is prohibited. This also applies to you if you work in third-party systems yourself.
The obligation to notify does not apply if you already have a license under Section 25 StrlSchG or if it can be ruled out that the people working in the external company will each receive a higher effective dose than 1 mSv in a calendar year.