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Radiation and Safety

In order to make full use of the user facilities at HZB you must first make sure that you adhere to several safety and access regulations.

  • The process to meet the regulations mentioned on this page might take quite some time.

  • We recommend you start to take the appropriate steps at least 3 months prior to your experiments.

  • We also recommend you do the online trainings at least 3 weeks prior to your planned experiments.

Please make sure you meet all the Radiation Protection Regulations.
Additionally two online trainings are mandatory.

For experimentalists
Both the online radiation protection training and the online safety training for experimentalists are available exclusively through GATE. You need to have a valid GATE account in order to be able to access the online briefings.

For other visitors to BESSY II
Please use the following links to complete the online radiation protection training and the online safety training before traveling to BESSY II.


SSR number (radiation protection register number)

In order to be able to clearly associate entries, the Federal Office for Radiation Protection (BfS) assigns a personal identification number for each person to be registered, the radiation protection register (SSR) number. All guests, users or employees of external companies who want to work in the BESSY II (or MLS, HoBiCaT, bERLinPro) experimental hall require the SSR number.

NO dosimeter and NO access to the BESSY II experimental hall without SSR number.
More detailed information can be found here: SSR Number

Important Information for IRIS and THz beamline Users

Most of the experiment hall of BESSY II is not a controlled area but a monitored area, and users working there are no longer required to have the status as radiation workers. Access to monitored areas can be granted without radiation passport, confirmation letter and RPDC (Radiation Protection Delimitation Contract). All other requirements and restrictions listed HERE will remain unchanged.

PLEASE NOTE: The area above the storage ring, housing the IRIS and THz beamline, remains a controlled area. Access to controlled areas can only be granted with radiation passport, confirmation letter and RPDC. Please visit the webpage for more detailed information.


Security Check concerning the German Law on Foreign Trade (AWG)

For legal reasons the access to the HZB campuses is subject to certain restrictions for citizens from non-EU member states and from the countries listed in the update version of the German Foreign Trade Regulations (AWV). In addition, according to recent restrictions set by the European Commission HZB is following the EU restrictive measures for Iran with effect on persons with Iranian citizenship. In case you are not sure about the status of your home country, you may check with the List of countries with no AWG restrictions or contact the HZB User Office.

In order to enable the access to HZB we need the following documents from everyone who intends to take part in an experiment at HZB and who falls under the abovementioned restrictions:

  • short curriculum vitae (up to date)
  • copy of passport (incl. photo, passport number)
  • visa (if applicable)/residence permit in case the work place is located outside the home country

As a member of an experimental team you will find information on whether an AWG check is necessary or not in GATE. Please log into your GATE account and look up the "Prepare beamtime" section.

An update of your documents needed for the AWG check, or a short statement in case there are no changes since your last visit to HZB, is required for every new visit.