The CT scanner installed base in France and recommendations for radiation protection in medical imaging
Publication date: 4/11/19
In answer to a joint request from the Directorate General for Health (DGS, Ministry of Health) and the Directorate for Social Security (DSS) regarding the French computed tomography (CT) scanner installed base and recommendations on good practices taking into account the needs of radiation protection in medical imaging, IRSN used two databases for which it is responsible by regulations: SIGIS, the information and radioactive sources management system (irsn.fr/sources), and the application for the diagnostic reference levels management. IRSN also held hearings with associations of professionals on topics in connection with the request.
This study highlights the need for change by focusing on IRSN’s field of competence: radiation protection.
Download the study on the CT scanner French installed base.
Exposure of children to ionising radiation due to diagnostic medical imaging procedures performed in France in 2015
Publication date: 08/07/2019
The purpose of this report is to establish data for the year 2015 on the exposure of French children aged under 16 years to diagnostic medical imaging procedures involving ionising radiation (conventional and dental radiology, diagnostic interventional radiology, computed tomography and nuclear medicine). The study was conducted using the échantillon généraliste des bénéficiaires, a sample on a 1/97th scale of the healthcare consumption of the population covered by the main French health insurance schemes.
Around 604 diagnostic procedures per 1.000 children were performed in 2015, a near stable figure (+1.5%) compared to the year 2010. The proportion of children who had at least one diagnostic procedure was 31%, up by 2 points from 2010. The annual mean effective dose is 0.135 mSv per child, exposed or not, down 25% from 2010, while the mean effective dose per exposed child is 0.43 mSv, down 34% from 2010. Exposure is extremely varied among exposed children, since half of them received a cumulative annual effective dose of 0.02 mSv or less. Relative to the number of children exposed in their age group, children aged under 1 year are the most highly exposed category, with a median annual effective dose of 0.55 mSv.
Children's exposure to ionising radiation originating from diagnostic medical imaging procedures decreased markedly in France between 2010 and 2015, even though the mean frequency of these procedures remained nearly stable over the same time period. This reduction in exposure is therefore due solely to an overall decrease in the mean dose per medical imaging procedure, which is related to improvements in technologies and practices.
Download the report IRSN PSE-SANTE/SER/2018-00004 « Exposure of children to ionising radiation due to diagnostic medical imaging procedures performed in France in 2015 » (PDF, 1,3 Mo)
Explanatory note regarding the new dose coefficients for radon recommended in ICRP Publication 137
Publication date: 18/12/2018
In January 2018, the International Commission on Radiological Protection (ICRP) issued its Publication 137 (Occupational Intakes of Radionuclides: Part 3). That document is part of a series of publications that aim to provide basic data and parameters, for the main chemical elements and their radioactive isotopes, to describe the distribution of these elements in the human body in the event of intake.
IRSN’s explanatory note presents the new dose coefficients adopted by the ICRP for radon inhalation, specifies the assumptions and scientific data on which they are based, and discuss the associated uncertainties.
In 1993, the dose coefficients for exposure to radon and its progeny recommended in ICRP Publication 65 were 1.4 mSv per mJ h m-3 for workers and 1.1 mSv per mJ h m-3 for the public respectively. These coefficients were based on an epidemiological approach.
Taking the dosimetric approach into account, the ICRP recommends in its Publication 137 using a dose coefficient of 3 mSv per mJ h m-3 for workers in underground mines and in buildings in most situations. This dose coefficient also applies to public exposure situations in dwellings. For specific indoor work situations involving intense physical activity and for tourist caves, it recommends a dose coefficient of 6 mSv per mJ h m-3.
Download the report IRSN PSE-SANTE/2018-00002 « New dose coefficients for radon recommended in ICRP Publication 137 - Explanatory note » (PDF, 319 Ko)
Study on the implementation of linear accelerators coupled with a nuclear magnetic resonance imaging system in radiotherapy (MR-linacs)
Publication date: 16/11/2018
In the frame of the marketing of new radiation therapy devices coupling a linear electron accelerator to a magnetic resonance imaging system (MR-linac), the French Nuclear Safety Authority requested IRSN to provide a state of the art for this technology and to identify any points requiring vigilance.
IRSN's analysis relied on the expertise of the French Medical Physics Society, SFPM. The numerous observations and recommendations established by the IRSN/SFPM working group are synthesized in the advice published by the IRSN.
Download the study (PDF file)
Critical review: Epidemiological studies of leukaemia in children and young adults around nuclear facilities
Publication date: 22/04/2008
The German Federal Institute for Protection against Ionising Radiation made public a multi-site epidemiological study on 10 December 2007. This study covered 16 nuclear sites in Germany. The study meets the international scientific criteria.It establishes an excessive risk of leukaemia in children under five living within a radius of 5 km around German nuclear power plants.
The IRSN epidemiologist researchers have undertaken a critical review of all international scientific literature on the risk of leukaemia in children living near nuclear facilities.
Download the critical review summary (PDF file)
Evaluation guide for the radiological impact study of a basic nuclear installation (BNI) as a support for the authorization application of releases
Publication date: october 2002
At the time of a licence application of effluent releases and water pumping of basic nuclear facilities (BNF), the operator of the installation must in particular provide a radiological impact study of the radioactive effluent releases coming from the installation on the environment and on pubic health.
An impact study of the radioactive releases represents technical and conditional specifications. It was for this reason that the French Safety Authority (ASN then DSIN) and the Directorate-General of Health Services (DGS) requested IRSN (then IPSN), in April 1999, to develop a guide facilitating the review of such a study, as well for the services implied in the examination of the licence applications, as for all the concerned parties in this field.
The objective of the guide is to take into account the regulatory context which underlies the development of the impact studies (decree n°95-540 of May 4, 1995, modified by the decree n°2002-460 of April 4, 2002, and the Euratom guidline 96/29 of May 13, 1996, known as “the basic standard guideline”, accompanied by its transposition texts in French law).
In this precise context, the guide proposes to assess the radiological impact study of a BNF from three different angles:
- the description and the quantification of the produced effluents, by taking account of the triggering processes, of the different processing measures and of the procedures to optimise the reduction of the produced effluents;
- the estimate of the dosimetric impact of the planned releases on the population, taking into account the environmental characteristics of the installation;
- the definition of the conditions to monitor the releases and the environment.
This guide provides a general condition logical framework adaptable to any particular situation met.
Download the guide (PDF file)