Host institution
Swedish Defence Research Agency (FOI)


Stockholm, Sweden

23 to 25 September 2014

The working language of the workshop is English.

Point(s) Of Contact
Ms. Jennifer Phoa-Sun
Training Clerk IDC/CBT
CTBTO Preparatory Commission
Vienna International Centre
P.O.Box 1200
1400 Vienna, Austria
Tel.:+43 1 26030 6171
Fax:+43 1 26030 5973



One of the primary tasks when analysing radionuclide data from the International Monitoring System (IMS) for verification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) is to locate and characterize the sources of the measured radionuclides. National Data Centres must perform a timely, accurate and robust analysis on a routine basis of nuclide specific data from a global network of monitoring stations. The work includes identification of anomalies and source attribution when possible.

There is a need for an in-depth scientific discussion on how measurement data and atmospheric transport modelling (ATM0 techniques can be used in a combined analysis to optimize accuracy and robustness in the source locations obtained, and how to quantify precision and accuracy. The goal of the workshop is to review and identify the most effective ways forward within the main areas of measurements, ATM and combined analysis.


The following topics shall be addressed in the workshop presentations and discussions:

  • Defining the problem and constraints in time, space, and data. What are the needs of the NDCs? What is the role of source location in a full NDC analysis?
  • Review of current algorithms on source location. What methods are used today at different NDCs and at CTBTO? Strengths and weaknesses? Are different methods required to address different problems or different hypotheses? Do we interpret the output correctly? What can we learn from other applications or fields of research?
  • What do the radionuclide measurements tell us? Coupling of measurements data to atmospheric transport modelling. What is a detection? What is a non-detection? How should non-detections be accounted for?
  • Uncertainties in atmospheric transport models and how they affect source location.
  • Case studies (DPRK underground nuclear tests, Isotope Production Facilities, Fukushima)

The way forward

  • Which are the most promising methods? How can measurements, ATM products and software analysis tools be adapted to enhance source location capabilities? Can course location estimates be utilized in other products, for example in data fusion and laboratory measurements? 


Participants Profile
Experts from the National Data Centres, academia, research institutes and environmental monitoring agencies having scientific interest in combining the measurements of airborne radionuclides with atmospheric transport models and subsequent inference of source location.

All workshop participants need to submit an abstract. 


Application Procedures
Applicants are invited to submit an abstract relevant to the objectives of the Workshop via the registration platform:

No registration fee will be charged. Deadline for applications is Friday, 11 July, 2014.

State Signatories wishing to nominate experts are requested to inform the Provisional Technical Secretariat (see Point of Contact) through their respective Permanent Mission. 

Financial Information
Applicable to PTS-funded participants only.

In accordance with the Staff regulations and rules and Administrative directives, the PTS will provide the following:

  • A Daily Subsistence Allowance (DSA) that is sufficient to cover related expenses during the workshop programme;
  • The PTS travel agent will reserve, issue and send the flight tickets to the participants for the most direct and economic route;
  • Funded participants are not allowed to purchase their own tickets unless, under exceptional circumstances, they are authorized to do so and only if this proves to be most cost efficient for the PTS;
  • The PTS will book a hotel and cover the costs for the accommodation and training participants will receive their remaining Daily Subsistence Allowance upon arrival; and
  • Health insurance will be provided that covers the duration of the workshop.

Other Pertinent Information

Participants should apply for visas, if needed, at the corresponding consular office upon receipt of an Acceptance Letter from the PTS, in order to ensure timely processing.