When you fill out the registration form, be careful to read ALL of it,
all the way to the bottom. To obtain a user name and a password for the
TDB database, you have to fill out the part after the headline
"Additional Database Access Registration", and check the checkbox for
"Chemical Thermodynamics". Note that you must be a citizen of an NEA
member country to be granted access.
If you don't fill out this last part of the form, you will be
registered as a user, but will not be sent a user name and a password.
If you think you have filled out the form and registered correctly,
but still don't get a password and a user name within a week or so, please
This problem can have several causes. Please verify that
You are not trying to access a part of the website that is not for public
use. To access the review review group pages, you have to be
a member of the review team in question or of the TDB Management Board
or Executive Group. These web pages contain only internal material (drafts,
mailing list archives etc.) which is not of public interest, and cannot
be accessed by people who are not part of the project.
You have waited at least 24 hours (not
counting weekends) after obtaining a user name and password before
trying to access the pages.
You have entered your password and user name using all
lower-case letters. The password and user name are
case-sensitive, and entering i. e. "SMITH" or "Smith" instead of "smith" as
your user name will not work. Your user name is probably
your last name only in lower-case, but for obvious reasons
this is not always true (there are many "Smith"s out there).
You are using the latest and greatest version of your internet
browser. Some older versions of certain browsers have problems
transmitting the user name and password information correctly.
You are not trying to access the NEA web pages between 21:00 and
22:00 CET (=GMT+1 wintertime, GMT+2 during the summer). The web
pages are normally automatically updated at that time, which may
cause access problems.
Sometimes there are temporary problems with internet
connections. Please wait 24 hours and try again before you decide that
you cannot access the web pages. If all else fails, send mail to
and ask for help. We try to
answer as soon as possible, but cannot always guarantee a swift
response due to the workload.
Send an e-mail to
and ask for
the required information. Please use the e-mail address you used when
you registered to send the request.
NB: If you already have a user name and a password, and have merely
forgotten what they are, do not re-register to get a new password
and user name. This will only confuse our registration system, and
may cause delays in making your account functional again.
Please send an e-mail instead.
At the beginning of the TDB project, it was planned to scan most of the available literature for measurements, estimates
and compilations of thermochemical data of relevance to the project. These
"compiled" data were then inserted in the TDB database, and were previously
available through the TDB online database retrieval. It should be emphasised,
that these "compiled" data were entered directly from the available literature
without any critical evaluation whatsoever. The idea was to facilitate
the work of the different review groups within the project by providing
a cover-all initial literature search. However, as NEA resources for the
project were decreased over time, it became impossible to continue this
work. Literature scanning is now done separately by each review team for
the publications of interest to their particular review report and not
by the NEA. It is now many years since this kind of general compilation
was done actively by the NEA. When the online access to the TDB database
was changed earlier this year, it was decided to include only the selected
data, i. e. data that has been evaluated by the review teams and published
in the review reports. This was done for two reasons:
Providing "compiled" data alongside with the selected, evaluated
data could easily confuse people and give them the impression that all the
data were endorsed by the TDB project.
For reasons outlined above, the set of merely "compiled" data in
the database was in any case badly out of date, and did not in any way
provide a complete literature coverage.