Quels sont les tests statistiques mis en oeuvre dans les EIL de l'IRSN ?
Quels sont les critères utiliser pour évaluer la performance des laboratoires ?
General terms of IRSN proficiency testing participation (english version)
General terms of IRSN proficiency testing participation (english version) are available on the joined file.
General terms of IRSN proficiency testing participation (french version)
General terms of IRSN proficiency testing participation (french version) are available on the joined file.
User's guide (english version)
User's guide (english version) is available online
User's guide (french version)
The user's guide (french version) is available online.
What is the signification of CILEI
IRSN Organized Interlaboratory Comparisons for the Environment
How to register to an IRSN Proficiency testing
Any laboratories wanting to test their performance can register to an IRSN proficiency testing. To do that, they have to create their own “My laboratory space”, choose the test they want to register, read the presentation form and fill out the registration form.
What kind of update is available on the website related to a proficiency testing
The site is periodically updated. Each update for a proficiency testing results by a message sent to all of the registered laboratories.
What is the structure of the CILEI website
The website is entirely dedicated to the IRSN Organized Interlaboratory Comparisons for the Environment. Search is possible for past, present and coming proficiency testings. Information is available about news and events (conferences, new online proficiency testings, etc). A list of questions/responses “FAQs” related to proficiency testing is consultable. You can send, if you wish, an e-mail message to the organizers of the test.
A database is available to subscription to the laboratories interested in the IRSN proficiency testings. In this way, it will receive an e-mail when the registration is open to a new proficiency testing. If it’s interested in it, it can register.
Each participating laboratory has its own “My laboratory space”. This space makes possible to visualize current tests and manage those in which the laboratory participates. Registered laboratories can also visualize the history of the tests with participation of their laboratory, starting the date of the creation of “My laboratory space”.
Which papers are available in the “My laboratory space” after the closing date of a proficiency test
A few months after the sending out of the final report, the proficiency testing will be closed by IRSN. After that day, the only paper consultable on the test site will be the final report of the proficiency testing.
How to get informed about a new proficiency testing
There are two possibilities to get to know about a new test:
• If the laboratory has never participated in any of the IRSN proficiency testings, it can register in the “Database of the laboratories”. It will be informed by e-mail about the on line availability of the registration form.
• If the laboratory has already participated in one of the IRSN proficiency testings and has already a “My laboratory space”, it will receive automatically an e-mail, informing the laboratory about the on line availability of the registration form.
How to add/delete an affiliated member to “My laboratory space"
To create or delete an affiliated member, the person in charge of the laboratory space must connect to “My laboratory space”, in the rubric “Management of my space” must click on “Management of affiliated member” and on that page it’s possible to delete or add a new member.
How to register to “My laboratory space"
To create “My laboratory space” you have to click on “Subscription" on my Lab space in the upper right corner of the CILEI homepage. The registration will be official, after the validation by the administrator of the site. After that an e-mail will be sent, alongside with the password, to the laboratory.
What is the difference between the “Data base of the laboratories” and “My laboratory space
Laboratories registered in the database receive an e-mail when a new proficiency testing is available online.
“My laboratory space” follows the registration to a proficiency testing. It is impossible to register without the creation of the “My laboratory space”. This space is dedicated to the:
• registration to a test,
• acknowledgement of a test item reception,
• submit the results, etc.
A laboratory which has created its own “Laboratory space” is automatically included into the database of the laboratories.
What to do if the person in charge of “My laboratory space” changes
In case of change of the person in charge of the "my laboratory space", the new manager must set the site connects to the lab space and then changes the manager's name and email to return the coordinates of the new person in charge of "my laboratory space". The new person in charge will received by email the password associated with his space.
Who can validate the results of a Proficiency test in “My laboratory space”
The following persons can validate the result transmission form in “My laboratory space”:
• the person in charge of the laboratory space,
• the person in charge of the proficiency test (if he/she is not the same as the person in charge of the laboratory space,
• all affiliated members authorized to validate the transmission form (authorization given only by the person in charge of the space).
Who can send an acknowledgment of receipt in “My laboratory space”
The person in charge of the space and the person in charge of the proficiency test can send an acknowledgment of receipt.
How ask a question to IRSN administrators
To ask a question, click on the button “contact” on the homepage. Automatically an e-mail is created with the organizer’s address. Describe in detail the inquiry.
Why should you subscribe to RSS flux
Subscribing to RSS flux allows to get informed by e-mail about the news, about the chosen category, as soon as the CILEI website has been updated. The subscription can be cancelled at any time.
How are prepared proficiency test items
The preparation of the test items depends on the matrix types. As regard to liquid matrixes, a large volume is homogenised in a tank before distribution using a peristaltic pump. The solid matrixes are first dried, grinded and shifted using a granulometer allowing the homogeneity of the samples. At last, they are homogenised and distributed into adequate vials.
According to the desired activity level and radionuclides, the matrixes are either “natural” sampled in the environment, or “spiked” in laboratory.
How is homogeneity guaranteed
The test item preparation chain is entirely conceived to ensure best homogeneity of the test items. This homogeneity is controlled by different measurements. Independently of the test result, dispersion related uncertainty between the test items is systematically added to the uncertainty related to the assigned value.
How is stability guaranteed
The test item preparation chain is entirely conceived to ensure best stability of the test items (in particular, by adding acid and carriers solutions to liquid samples). Furthermore, measurements are carried out in order to verify the samples’ stability during the whole proficiency testing. In case a test item evolution is observed, an uncertainty associated to this non-stability is added to the uncertainty related to the assigned value.
How is an assigned value determined
Generally, the assigned value is determined from the measurements carried out, according to a previously defined experimental plan. Thus, the value is the result of several measurements on several test items picked out randomly from the prepared test items. Thus, the uncertainty associated to the assigned value is related to the implemented test method.
In some particular cases (spiked matrices with artificial radionuclides), the assigned value may be determined by calculation (see NF EN ISO 17043)
How is laboratory assessment carried out
Laboratories are assessed according to the result of 3 tests:
• Relative deviation between the laboratory’s result and the assigned value;
• The En number test, which evaluates the compatibility between the value obtained by the participant and its associated uncertainty and the assigned value and its associated uncertainty ;
• z score, which characterises tolerance for the deviation between the assigned value and the laboratory's value as regard to the interlaboratory standard deviation.
Criteria associated to these 3 tests are variable and depend on the difficulty of the proficiency testing. Attribution of the agreement in the frame of the RNMRE network depends on the proposal decision of the laboratory agreement commission.
What is the laboratory agreement commission
The agreement commission consists of the following members:
- the president of the commission, a member of ASN;
- Qualified people, appointed by ASN;
- Persons of the Minister of Environment, of Health of Consumption, Agriculture and Defence;
- members of certified laboratories;
- members of accreditation and standard organisations,
- and of IRSN.
This commission decides (once every 6 months) on the agreement propositions of laboratories requesting for agreement.
How to request an ASN agreement
In order to obtain an agreement, the laboratory must file a demand at the ASN and an additional paper which content depends on the type of agreement demanded: first demand, an extension or a renewal (see official decision 2008-DC-0099).
What is a proficiency testing
A proficiency testing is an evaluation of participant performance against pre-established criteria by means of interlaboratory comparisons (see ISO 17043).
It consists of the distribution, if possible, of identical test items to a group of the participating laboratories. Further, the measurement results of the laboratories are compared to an assigned value in the aim to assess the performance of each laboratory in accordance with specified criteria.
Who can register to a proficiency testing
All laboratories willing to test their performances can register to an IRSN proficiency testing.
What is the foreseen planning of the proficiency testings
A first proficiency testing campaign is scheduled in the firth half of year N. The registration forms are sent out in January for the year N with registration deadline in February. The test items are dispatched to the participants in April. The assigned values are published on the website in July and the final report is sent out in October year N.
A second campaign is organized during the second half of year N. The registration forms are sent out in June year N, with registration deadline in July. The test items are dispatched to the participants in October year N. The assigned values are published on the website in January and the final report is sent out in April year N+1.
There is one proficiency testing campaign per year.
The registration forms are sent out in January year N with registration deadline in February. The test items are dispatched to the participants in March, the assigned values are published on the website in May and the final report is sent out in September year N.
What kinds of matrixes are proposed for proficiency testing
For IRSN proficiency testings, matrices proposed are:
• Biological samples (plants, fish, milk…)
• Aerosol on filters
• Gas-Air (carbon cartridge...)
• Ambient air (RPL dosimeter)
What are the activity levels of the IRSN proficiency testings
The activity levels depend on the matrix and on the radionuclides to identify and quantify. They can range between 0.1 Bq.L-1 as regard to the gamma emitters in water samples to 1000 Bq.Kg-1 dry for the natural radionuclides in solid matrixes.
The activity level for one proficiency testing is specified in presentation form.
How many laboratories participate in the proficiency testings
The number of participants is between 10 and 70 depending on the type of the proficiency testing. The average number of the registered laboratories is about 30.
IRSN does not fix a minimum number of participating laboratories.
What is an assigned value
An assigned value is a value attributed to a particular property of a proficiency test item.
This value defined by IRSN allows to evaluate the laboratories’ performances.
What is the difference between the proficiency testings organized for ASN (French Nuclear Safety Authority) and proficiency testings organized for the DGAL (General Directorate of Food Administration) and the DGCCRF (General Directorate for Competition Policy, Consumer Affairs and Fraud Control)
Proficiency testings organized for l’ASN essentially serve to obtain a certification granted by ASN (validity 5 years), to contribute to the National Network for Environmental Radioactivity Measurement (RNMRE) They concern all matrix types and all radioactive measurement category.
The activity levels approach levels present in the environment.
The proficiency testings organized for the DGAL and the DGCCRF serve to obtain a ministerial certification (validity 1 year), to food control. They concern exclusively biological matrixes and the measurement of gamma emitters at a level, corresponding to a radioactive contamination of a sample.
What are the statutory documents related to proficiency testing
In the frame of the RNMRE agreements, the associated statutory document related to proficiency testing is the official decision N° 2008-DC-0099 of ASN. This decision implements the organization of the national network of radioactivity measurement in the environment and defines the process to obtain an agreement.
In the frame of the General Directorate of Food Administration and the General Directorate for Competition Policy, Consumer Affairs and Fraud Control, the statutory document related to proficiency testing is the order of 29th December 2009 appointing the national reference laboratories in the field of veterinary and phytosanitary public health.
Which references are used in proficiency testings organization
NF EN ISO/CEI 17043: conformity assessment -general requirement for proficiency testing
COFRAC LAB CIL Ref. 02 Guide: Organisers of interlaboratory comparisons –requirement for accreditation
ISO 13528: Statistical methods for use in proficiency testing by interlaboratory comparisons
ISO 5725: Accuracy (trueness and precision) of measurement methods and results
ISO 17025: General requirements for the competence of testing and calibration laboratories
What does cover the CIL accreditation
IRSN has been accredited since 2006 for the organization of interlaboratory campaigns, under N° 1-1795. The scope of the accreditation is available on the COFRAC website (www.cofrac.fr).
What is the participation fee of a proficiency testing
The participation fee of a proficiency testing is 1570 € excluding VAT in 2014, more an additional dispatch cost and transportation fee which depends on the weight of the parcel.
What is our confidentiality policy
Anonymity is ensured by the attribution of a code to each participating laboratory, which changes for each proficiency test. During the treatment of the results and in the final report the laboratories are identified by their code.
What is the foreseen program of the proficiency tests
The foreseen program is available on the homepage of the CILEI website, using the “Search” button.
What are the missions of IRSN/PRP-ENV/STEME beside the organization of proficiency testings
• Development and maintain environmental radioactivity measurement techniques, as a support to different IRSN entities,
• Environmental and effluent sample processing and analyses at a recognized reference level,
• Radioactive source preparation,
• Participation in the elaboration of ISO and French standards