Author Archive

Radiological Converter vs. Mass Activity Converter++?

November 11th, 2017

(Qu.) What are the main differences between the Radiological Converter and the Mass Activity Converter++?
(Ans. Nucleonica Team) The Radiological Converter is a further development of the Mass Activity Converter++ with the following additional features:
* The list of conversion quantities now includes a) Air Kerma Rates b) Exposure Rates and c) Ambient Dose Equivalent Rates H*(10) for approximately 1500 gamma and x-ray emitting radionuclides (depending on the database used).
* The threshold energy used in the calculations for dose quantities can be set by the user to investigate the effect of low energy photons on the dose calculations.
* Account is taken of short-lived daughter nuclides when a parent nuclide is selected.
* The underlying dataset used in the calculations can be selected from a list of international nuclear datafiles (JEFF3.1, ENDF/B-VII.1, 8th TORI)

The Radiological Converter thereby provides the internationally accepted ambient dose H*(10) and is suitable for declarations of radioactive packages.

More info…
Radiological Converter wiki page

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Nuclear Security training course at BfS

November 10th, 2017

Nucleonica Training on Nuclear Security, 7-8 November, BfS Berlin, 2017
This 1-day training course took place at the offices of the Federal Office for Radiation Protection (Bundesamt für Strahlenschutz BfS) in Berlin, during the 7-8 November 2017. This was an intermediate level training course which focused mainly on the Nucleonica core applications with emphasis on Case Studies. A detailed description of nuclear data with particular reference to the various Nucleonica nuclear databases was given. Core applications were demonstrated through the use of Nucleonica applications such as the Radiological Converter, Nuclide Mixtures, Decay Engine++, and Dosimetry and Shielding H*(10).
BetasinTissueStopping of 500 keV beta particels in 1 mm tissue.

The main differences between the
1. Radiological Converter vs. Mass Activity Converter and
2. Dosimetry & Shieldimg++ vs. Dosimetry & Shielding H*(10)
were described in detail. Nuclear security related case studies were given on the identification of suspected nuclear and radioactive materials using Cambio and WESPA++.
In total, 12 persons took part in the course from the various BfS locations in Germany.

More info…
Nucleonica Training Course Proceedings

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Fundamental Constants updated

November 6th, 2017

Nucleonica’s Physical Constants have been upgraded to account for recent 2016 values for fundanmental contacts. Based on state-of-the-art measurements, the updated values of the constants were prepared by the CODATA Task Group on Fundamental Constants. The recently updated constants including the Boltzmann constant, the Planck constant, the electron charge and the Avogadro constant will be included in the next 2018 CODATA publication.
PhyConst2016

More Information
Nucleonica Physical Constants wiki page
The CODATA 2017 Values of h, e, k, and NA for the Revision of the SI
P.J. Mohr, D.B. Newell, and B. N. Taylor (2016), CODATA recommended values of the fundamental physical constants: 2014, Rev. Mod. Phys. 88, 035009.

Posted in Karlsruhe Nuclide Chart, Nucleonica | Comments (0)

Decay engine: daughters present at time t=0?

November 2nd, 2017

(Qu.) If we take Ra-224 as an example I can set the starting quantity (N0) of Ra-224. The other nuclides in the chain start with N0 = 0. But If I also have an amount of say Pb-212 at t= 0, i.e. N0 is not equal to 0 at t= 0. Is it possible to do this in the Decay Engine?
(Ans. Nucleonica Team) This is straightforward in Nucleonica. You first create a nuclide mixture with say Ra224 (1 MBq) and Pb-212(1 MBq). Then save with the name e.g. Ra-Pb mix.
You then go back into the Decay Engine and click on the Mixture Selection. You should then see the Ra-Pb mix in the drop-down menu. It may be necessary to refresh the page so this the new mixture is loaded. Then you can redo the decay calculation with the mixture. The results are shown below.
RA-PB

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New App Portal

October 25th, 2017

A new web page has been specifically designed to enhance the navigation through the ever-increasing number of Nucleonica applications and tools. The web page “App Portal” is based on the principles of Responsive Web Design (RWD) and Flat Design and is optimised for easy navigation on a variety of devices and window or screen size (e.g. tablets and smartphones). The new page has the following main features:
– Through the use of filters, the user can access all Nucleonica applications and tools (show all) or a subset of these applications and tools based on the most recently used (last used), most popular (popular), type (applications, data, knowledge), etc.
AppPortal-RWD– Icons are colour coded according to the categories: nuclear science applications (blue), data visualisation (green) and knowledge tools (violet). The last used nuclides (brown) have their own catergory (last nuclides).
– Each icon has the form of a box with header (similar to nuclide boxes in a nuclide chart). In the header part, a short name for the application/tool is given (e.g. DE++). In the central part of the icon, the full name of the application/tool is given (e.g. Decay Engine++).
– There is a “Classic” icon which allows users to access the previous version of the App Portal i.e. Nucleonica Classic applications page. This will be supported for a limited period to allow users to become familiar with the new App Portal page.

More information…
App Portal wiki page

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Karlsruhe Nuclide Chart Online (KNCO++) Revisited

August 22nd, 2017

The Karlsruhe Nuclide Chart Online (KNCO++) has been upgraded to provide the following new features:
– The colours used in the KNCO++ have been historically based on the modes of decay. A new colour scheme has been introduced which shows, in addition, the half-lives of the nuclides. The user can toggle between the decay modes and half-lives charts to obtain the complimentary Chart views.
KNCO_BG2Karlsruhe Nuclide Chart Online, KNCO++, with new features.
– The user can now select various pre-defined background colours to enhance the visual impact of the Chart.
– When the mouse cursor is placed over a nuclide, the nuclide box is highlighted and magnified (see example of U-238 above). On clicking on the highlighted nuclide, the Chart is zoomed to the nuclide selected thus provided a useful navigation tool.
– Literature references for the nuclide data are now availabe. A mouse right click on a nuclide opens a context menu from which a link to the references can be selected.

More info…
Karlsruhe Nuclide Chart Online wiki page

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Virtual Cloud Chamber revisited

August 7th, 2017

The Virtual Cloud Chamber has been updated. The previously used Cortona VRML plugin viewer used to view the GEANT4 3D simulations is no longer supported by modern browsers and has been discarded. In its place, the VMRL WRL files are now converted from WRL to X3D HTML format using a tool from InstantReality. A major advantage is that the converted files can now be shown directly in the browser – without the use of a plugin.
VCC-IR10 MeV photons incident on a lead target showing the production of electron -positron pairs in the presence of a magnetic field.

Animations can also be generated by the Virtual Cloud Chamber but these cannot currently be shown directly in the browser. To view the 3d animations, the user should download the Instant Reality player (instantplayer) for this purpose.

More info…
Virtual Coud Chamber wiki page
InstantReality downloads

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Nucleonica Get a Quote

August 3rd, 2017

It is now possible for new users to obtain a quote for a Nucleonica licence directly from the Nucleonica landing page. The new application allows the user to select the product (Nucleonica portal, Karlsruhe Nuclide Chart Online), their organisation type (academic, government, commercial) and the number of licences being requested.
GaQAdditionally, after entering some personal details, a pdf quote can be downloaded for the user’s purchasing / finance department. After issuing a purchase order (PO) the requested product will be invoiced.

More information
Get a Quote wiki page

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Problem with the decay chain of Pu-244 and the JEFF database

July 25th, 2017

Qu.(from M.R. KTE Karlsruhe): We encountered a problem while reproducing the decay chain of Pu-244.
The first decay is an α-decay to U-240 followed by a β-decay to Np-240. The question is if U-240 decays to the metastable or directly to the ground state of Np-240. In the universal nuclide chart application in Nucleonica it shows a difference between the JEFF (Np-240) and ENDF (Np-240m) databases.
When using the Decay Engine++ application only the Np240 ground state is shown. The (more like a juristical) problem is that our regulations only include the metastable state.
Do you have additional information about the decay of U-240? Which one is the physical correct daughter?

Ans.(Nucleonica Team): Indeed there is an error in the JEFF3.1 database. You can also see this clearly in the KNCO application where you see that U-240 decays to Np-240m only. In view of this, we have changed the data in JEFF3.1 for U-240 – allowing only the decay to Np-240m. This you can see in the Nuclide Datasheets.
If you now redo the decay calculation for Pu-244, you will see the Np240m is much more important than Np240.
Thanks again for pointing this out and hopefully it did not cause to much inconvenience. It just shows once again how important it is to have a number of databases for comparison purposes.

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New Blog category for Forum and FAQ posts

July 18th, 2017

From 2017, Forum and FAQ posts will be hosted together in a new Blog category FAQs.
Pre-2017 Forum and FAQ posts have been moved to Wiki page FAQs.

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