To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure firstname.lastname@example.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
When the sample activity is measured for various reasons
several times, then with each measurement can be associated an individual
decision threshold and limit of detection. Each measurement can
be analyzed through its own decision threshold. The whole measurements
can sometimes present contradictory results, some measurements being
lower than the decision threshold and other higher. The problem
then arises to build a decision threshold and a detection limit
taking into account all the individual results, and to decide if
the radioactivity is finally detected or not. It is interesting
to note that it is possible sometimes that the decision threshold
taking account all results makes it possible to decide that the radioactivity
is present whereas the totality of the individual results are negative
in terms of individual decision threshold. The purpose of this article
is to show how these thresholds and these coherent limits cumulated
can be determined in way according to the experimental conditions.
In a general way a rigorous method of cumulating makes it possible
to systematically decrease the decision threshold and limit of detection
in terms of activity. This approach has interesting applications
in gamma spectrometry with multi-emitters, discharge or periodical
environmental measurements. On the basis of measurements realized
by the IRSN within the framework of the national monitoring of the
environment, we will see the potential impact of these methods on
the final assessments.
In this article, we present a laboratory astrophysics experiment
on radiative shocks and its interpretation using simple modelization.
The experiment is performed with a 100-J laser (pulse duration of about
0.5 ns) which irradiates a 1-mm3 xenon gas-filled cell.
Descriptions of both the experiment and the associated diagnostics
are given. The apparition of a radiation precursor in the unshocked
material is evidenced from interferometry diagrams. A model
including self-similar solutions and numerical ones is derived
and fairly good agreements are obtained between the theoretical
and the experimental results.
Email your librarian or administrator to recommend adding this to your organisation's collection.