Archive for the ‘Nucleonica’ Category

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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JRC users now with access to the KNCO++

July 17th, 2017

All users from the European Commission’s Joint Research Centre (JRC) now have additional access to the Karlsruhe Nuclide Chart Online (KNCO++). This has been arranged through a new license agreement from June 2017 between the JRC and Nucleonica GmbH.
KNCO_JRCThe Karlsruhe Nuclide Chart Online, KNCO++, provides the latest new and updated experimental data for ground states and isomers with structured and accurate information on the half-lives, decay modes and energies of the emitted radiations. For information on training courses on the Nucleonica portal and the Karlsruhe Nuclide Chart please contact the Nucleonica Team at

More information
Karlsruhe Nuclide Chart Online (KNCO++) wiki page

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I have registered with Nucleonica, but did not receive am email with login details

June 29th, 2017

Qu. I have registered with Nucleonica using the SIGN UP NOW form, but did not receive am email with login details
Ans. If you do not receive the confirmation e-mail with your username and password directly following registration, please check your Spam folder (see image below).

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Difference between the D&S H+(10) and D&S++ for dose calculations?

June 26th, 2017

Qu. I have difficulties to understand the differences between D&S++ and D&S H*(10). I read the wiki, but still find myself wondering what causes the difference in calculation.
Ans. The main differences between D&S++ and D&S H*(10) are the following:
1. Short-lived daughters are included automatically in H*(10) version but not the ++ version.
2. Buildup calculations are now more accurate in H*(10) than in the ++.
Most importantly:
3. Internationally standardised H*(10) is calculated rather than the Htis in the ++ version. The difference between H*(10) and Htis is that Htis just calculates the dose absorbed in a thin layer near the surface. In the H*(10) the dose is calculated at a distance of 10 mm inside the surface and also takes account of backscattering from behind the point in question. i.e. H*(10) makes two additional calculations (1) the attenuation over a distance 10mm is calculated and (2) backscattering from deeper tissue to the surface. See image below.H10doserate

Qu.:It’s still confusing for me. What I am not understanding: what is the difference in the calculation, between what was done before, and what is done now. Is it just a coefficient which change in the formula? Which one? Or the whole principle which change? The definition of H*(10) and Htis is understood, but not the way it is computed, I think this is the main problem.
Ans.:It is not just a change in a coefficient. Its really a different principle.
To calculate H*(10), one first calculates the kerma rate at the surface Kair.  The kerma is similar to the exposure or the dose rate in air at the surface (approximately!).
Knowing the kerma rate at the surface one then calculates H*(10) inside the body using H*(10) = Kair * (H*(10)/Kair). The quantity in brackets in a function of energy and has to be calculated for every gamma energy by Monte Carlo. 
This function evaluated using Monte Carlo and is shown here..
This section gives a detailed description of how H*(10) is calculated in Nucleonica. Its all a bit mathematical but at the end of the day, it gives values which are about 10-20% higher than those calculated using D&S++ (i.e. Htis).

Qu. You state that H*(10) should give results 10-20% higher – can you expand?
Ans.: Consider Co-60: H*(10) = 0.3539 µSv/h using D&S H*(10) no shielding. Htis = 0.337 µSv/h using D&S++ no shielding. So for Co-60 the H*(10) values is about 5% higher than the Htis value. The reason why the H*(10) is higher than Htis is due to scattering of radiation from deeper inside the bode back to the surface. This is neglected in the calculation for Htis.

We have introduced this H*(10) on the request of some users. For official declarations, only the H*(10) is acceptable and not the Htis as calculated in D&S++.

More info…
Nucleonica Support

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New Nucleonica Landing Page

June 22nd, 2017

The Nucleonica landing page at has undergone a complete redesign to make it more compatible with tablet and mobile devices using the principles of Responsive Web Design.
NuLP1Nucleonica Landing Page at The main graphic shows how the page is displayed on a PC. The inset shows the page on a mobile device.

– The landing page provides links to the most important information for potential users: Applications, Pricing, Clients, KNCShop (Karlsruhe Nuclide Chart Shop). For users interested in registering for Free Restricted access, the SIGN UP NOW buttons are shown prominently. Existing users can access the portal via the login button with username and password.
– The new Landing Page features are supported by most major browsers including Chrome, Firefox, Internet Explorer, Safari.

More Information:
Responsive Web Design (Wikipedia)
The Landing Page description in the Nucleonica Wiki

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Karlsruhe Nuclide Chart Online – Literature references now available

May 31st, 2017

Following user requests, the Karlsruhe Nuclide Chart Online (KNCO) has now been updated to provide the literature references for the nuclide chart updates in the various editions. This allows users to trace the literature references used in the nuclide data evaluation process.Pt196In the example above the references for Pt 196 are shown. From the KNCO, the nuclide Pt 196 is selected. Using the right mouse click, a Show References link leads to the latest references for this nuclide also shown above. The references are subdivided according to the edition (e.g. 10th, 9th, 8th). For each edition the entries are arranged according to Spin and Parity, Half-life, Radiations/Decay Modes, and Cross-sections.

More information
Karlsruhe Nuclide Chart Online (KNCO) wiki page

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