Vienna, Austria 

3-4 October 2019

The working language will be English

Capacity Building and Training Section
International Data Centre Division, IDC/CBT 
CTBTO Preparatory Commission 
P.O.Box 1200
A-1400 Vienna, Austria
Tel.:+43 1 26030 6147
Fax:+43 1 26030 5973



Special Studies provide in-depth, technical reviews by expert analysis of data from the International Monitoring System (IMS) to improve the estimated values for the standard signal and event parameters resulting in an Updated Radionuclide Report (URR). The purpose of the Expert Technical Analysis (ETA) of IMS data and other relevant data provided by the requesting State Party is to assist the State Party concerned to identify the source of specific events. The output is the State Requested Methods Report (SRMR).

URR and SRMR need to be seen in the context of the standard products they are building on, specifically the Standard Screened Radionuclide Event Bulletin (SSREB). Beyond its current implementation it may contain among others the use of atmospheric transport modelling results to combine field of regard information from all radionuclide samples sharing a possible common source region related to a single event. If available, information derived from isotopic ratios is included and may be used to confine the field of regard.

The objectives of this technical expert meeting are:

  • Review methods that may be suited for Special Studies and ETA;
  • Discuss the possible content of the URR and SRMR;
  • Explore the potential use of various non-IMS data for SRMR;
  • Advance common understanding of methods to be developed for the SSREB, URR, SRMR and NDC responsibilities. 

Meeting participants are welcome to contribute to the technical meeting by making a 15 minute presentation related to one of the Agenda topics.


  • Summary of the first expert meeting on Special Studies and ETA with RN and ATM methods;
  • Proposals for potential radionuclide and ATM methods for Special Studies and ETA;
  • Possible use and integration of non-IMS data;
  • Expert radionuclide analysis methods like summation of spectra of samples that appear to be related to the same event;
  • Potential role of CTBT radionuclide laboratories;
  • ATM methods to locate the source for single or multiple samples;
  • Characterization of the atmospheric isotope background based on known man-made sources;
  • Event time estimation from isotopic ratios;
  • Source characterization with isotopic ratios;
  • Fusion between radionuclide and SHI events;
  • Conclusions of the technical meeting in view of methods still to be developed for direct implementation in the SSREB and for possible application in Special Studies and ETA.



Experts from NDCs and research establishments that are involved in applying and developing radionuclide and ATM methods that may be suitable for Special Studies and Expert Technical Analysis.


Applicants are requested to visit our website Opens external link in new and apply online latest by 3 June 2019. 

Financial support may be available for a limited number of participants. Such assistance must be requested at the time of registration (by selecting the relevant box during online registration) and no later than 3 June 2019

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

Applicable to PTS-funded participants only

In accordance with the Staff regulations and rules and Administrative Directives, the PTS will provide funded participants with a daily subsistence allowance (DSA) and financial support to cover travel costs.  

  • The DSA will be sufficient to the cover related expenses during the expert meeting programme; 
  • The PTS travel agent will reserve, issue and send the flight tickets to the participants for the most direct and economical route;
  • Funded participants are not allowed to purchase their own tickets unless, under exceptional circumstances, be authorized to do so and only if this proves to be most cost efficient for the PTS; and 
  • Health insurance will be provided for the duration of the expert meeting programme. 

Requirement: scanned passport copies. 


In order to ensure timely processing, participants should apply for visas, if needed and as soon as possible, at the corresponding consular office upon receipt of an Acceptance Letter from the Provisional Technical Secretariat.

Health/Accident Insurance
It is strongly recommended that prior to departure all participants should acquire health and accident insurance for the duration of the meeting.