Medical Radiology and Radiation Safety. 2023. Vol. 68. № 5


S.A. Ryzhov1,2,3, B.Ya. Narkevich1,4 , A.V. Vodovatov5,6

To the Question of the Interpretation of the Terms “Dose Limit”
and “Radiation Accident” in the Development of New Norms of Radiation Safety

1 Association of Medical Physicists of Russia, Moscow, Russia 

2 Dmitry Rogachev National Medical Research Center for Pediatric Hematology, Oncology
and Immunology, Moscow, Russia 

3 Scientific and Practical Clinical Center for Diagnostics and Telemedicine Technologies, Moscow, Russia 

4 N.N. Blokhin National Medical Research Center of Oncology, Moscow, Russia 

5 P.V. Ramzaev Saint-Petersburg Research Institute of Radiation Hygiene, Saint-Petersburg, Russia

6 Saint-Petersburg State Pediatric Medical University, Saint-Petersburg, Russia

Contact persons: Boris Yaroslavovich Narkevich, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.



Purpose: To analyze the existing in NRB-99/2009 and proposed in the journal “Medical Radiology and Radiation Safety” interpretations of the terms “dose limit” and “radiation accident” when developing a new version of this regulatory document.

Material and methods: The features of the interpretation of these terms are considered both in NRB-99/2009 and in a number of domestic and international reference books and glossaries on radiation safety, including proposals published in No. 4 of the journal “Medical Radiology and Radiation Safety” for 2023.

Results: The interpretation of the numerical values of the dose limits proposed in the indicated journal seems to be poorly substantiated, while their traditional interpretation remains more preferable. The addition of the concept of a radiation accident with the term “emergency” with its own explanation by the authors of the article contradicts the recommendations of the IAEA. The necessity of taking into account the specifics of radiation accidents in medicine when interpreting the term “radiation accident” is shown.

Conclusions: 1. There is no need to revise the traditional interpretation of the numerical values of dose limits. 2. It is expedient to replace the wording of the concept of a radiation accident existing in NRB-99/2009 with the wording of the same concept from the IAEA glossary on radiation safety. 3. Taking into account the need for a correct interpretation of the concept of a radiation accident in medicine, the terms “radiation incident”, “unintentional (accidental) medical exposure” and “radiation accident” with their corresponding interpretations should be added to the new version of the NRB.

Keywords: radiation safety standards, dose limit, radiation accident, interpretation of terms 

For citation: Ryzhov SA, Narkevich BYa, Vodovatov AV. To the Question of the Interpretation of the Terms “Dose Limit” and “Radiation Accident” in the Development of New Norms of Radiation Safety. Medical Radiology and Radiation Safety. 2023;68(5):38–43. (In Russian). DOI:10.33266/1024-6177-2023-68-5-38-43



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Conflict of interest. The authors declare no conflict of interest.

Financing. The study had no sponsorship.

Contribution. Article was prepared with equal participation of the authors.

Article received: 20.04.2023. Accepted for publication: 27.05.2023.