Author Archive

Decay Engine++ with Source Terms

July 12th, 2018

It is now possible to use source terms in Nucleonica’s Decay Engine++. Given the production rate(s) of the source(s) and duration in time, the activity buildup for the parent(s) and daughters (during the production time) is calculated using the Bateman equations with source term(s). At the end of the production time, the source term is switched off and the nuclides decay as described by the Bateman equations with no source(s).
As an example, consider the production of Rn212 at ISOLDE in CERN using 4 hours of beamtime. The produced Rn212 will decay to Po208 which has the potential to contaminate the accelerator.Rn212-Source

The diagram shows the buildup of Rn212 and Po208 during the 4h production period. Thereafter, the Rn212 (halflife 24 m) decays leaving the longer-lived Po208 (half-life 2.9 y) in the system.
The Decay Engine++ can also be used in the case of multiple sources. In a first step a nuclide mixture is created containing the quantities of the source components (in Bq, Ci, mole, etc.). Thereafter the Decay Engine++ is used for the mixture. When the “source rate” units are selected (e.g. Bq/s, Ci/s, mole/s etc.), the source terms are interpreted as source rates.
During the development of the Bateman solution for constant source terms, numerical instabilities were observed principally for short production and decay times typically used in practical applications. To overcome these issues a multiple precision mathematic library was introduced into Nucleonica giving the user the opportunity to select the precision of the Decay Engine++ calculations to avoid such numerical instabilities.

More information:
Nucleonica’s Decay Engine++ wiki page

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WESPA++ with new features

June 21st, 2018

Nucleonica’s Web Spectrum Analyser (WESPA++) has been extended to include the following new features:
* 5 generic detectors from high to very low resolution are now available (HPGe, CdZnTe, LaBr3, NaI, CsI)
* A peak can be deleted from the list of identified peaks
* A peak can be added to the list of identified peaks
* Peak area and detection limit functions can be shown on the spectrum graph
* Half-life column is added into the candidate nuclide grid
PA-DL2The original spectrum (red) is shown with identified peaks (black triangles). The peak area (green) and the detection limit/threshold (blue) functions are shown superimposed on the original spectrum. The detection limit/threshold is proportional to the uncertainty in the peak area calculation. Only peaks with peak area function above the detection limit/threshold can be classified as real peaks.

In the figure above, the spectrum in red shows the peaks and the background. The green curve shows the area function for the (red) spectrum. Associated with this area function is the detection limit / threshold function in blue which is related to the uncertainty in the area calculations. Only when the green curve lies above the blue curves are real peaks to be seen (denoted by a black triangle). It may be necessary to zoom into the peak area to see the exact location of the green and blue functions.

More info…
Nucleonica’s Web Spectrum Analyser (WESPA++) wiki page
WESPA++: Web Spectrum Analyser for Nuclear and Radioactive Material Identification

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Unidentified peaks in I-125 spectrum

May 30th, 2018

Qu. (from Z. S. JRC Karlsruhe) Using the Gamma Spectrum Generator app in Nucleonica I have created a gamma spectrum for I-125 (shown below). Comparing the results from the Nuclide Datasheets++, I find the three lines at approx. 35, 31, 27 keV (see inset from the Datasheets++). Where do the extra peaks at approx. 21 and 17 keV come from?
UnPeaksAns. (Nucleonica Team)
The additional lines from the I-125 spectrum are X-escape peaks.

Ge emits X-rays at approx. 10 keV (Intensity 48%), 11 keV (intensity 6%), and about 1.2 keV (Intensity 0.5%) so Xesc-peaks can be expected at:
21 keV = 31 keV – 10 keV
20 keV = 31 keV – 11 keV and 21 -1.2

17.6 keV = 27.5 – 10 keV
16.5 keV = 27.5 – 11 keV and 17.6 – 1.2

25.4 keV = 27.5 -1.2 keV
The relative intensities correspond about to the relative Ge X-ray intensities.
More information:
X-Ray Emission Lines
X-ray Escape Peaks

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Action required by users to confirm new privacy policy

May 29th, 2018

Nucleonica Compliance with the EU-GDRP from 25 May 2018:
Nucleonica has updated its Privacy Policy to be compliant with the European Union’s General Data Protection Regulation (EU-GDPR) from 25 May 2018. As a registered user of the Nucleonica portal we need your agreement with this new Privacy Policy.
PP-Agreement

More information:
Nucleonica’s Privacy Policy page

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New Privacy Policy for EU-GDPR (25 May 2018)

May 24th, 2018

Nucleonica has updated its Privacy Policy to be compliant with the European Union’s General Data Protection Regulations (EU-GDPR) from 25 May 2018.
Whether you are a customer or a visitor of our website: we respect and protect your privacy. This Privacy Policy Statement applies to the usage of the online portal at www.nucleonica.com which is operated by Nucleonica GmbH. Nucleonica will not disclose any customer related data to any third party, save as expressly mentioned herein or if required by law or regulation. Additional points covered by the new Privacy Policy include:
– Declaration of consent and authorization
– What type of data is collected by Nucleonica?
– Collection of data during registration
– Collection of data during usage
– Disclosure of data
– How long is my user data stored?
– User Information
– Withdrawal of consent
– Cookies and Tracking

More information:
Nucleonica’s Privacy Policy page

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Feedburner Deactivated

May 3rd, 2018

Because of recent problems, the Feedburner service for managing RSS feeds has been deactivated. The Nucleonica Blog posts are now sent directly to Nucleonica’s Networking page using the WordPress feeds. Users can no longer receive these post feeds via email. However, the most recent feeds are shown directly on the Networking page.

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e-Ship streamlined

April 30th, 2018

Following the CERN training course in April, the e-Ship++ transport assistant has been streamlined and made more coherent from a training perspective.
The transport characterisation based on A1 and A2 coefficients and activity limits has been more clearly separated from the source characterisation based on Swiss RPO. This allows new users to concentrate on the transport aspects of the package.
eship_Reporte-Ship++ transport report showing only the main tranport characteristics.

The source characteristics are an advanced option which allow users to estimate the radiological impact of the shipment in the event of a release of radioactivity into the environment. The source characterisation also allows to declassify materials according to clearance limits and authorisation limits, and calculate the surface and air contamination limits.

More information:
e-Ship++ wiki page

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Nucleonica Training Course, CERN, 16-17 April 2018

April 20th, 2018

Introduction to Nucleonica: Core Applications and Tools, 16-17 April, CERN, Switzerland, 2018.
This 2-day course 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 the Radiological Converter, Nuclide Mixtures, Decay Engine++, and Dosimetry and Shielding H*(10). The new e-Learning centre to support the Nucleonica applications was described.
IMG_20180416_144805 A key lecture with exercises was given by Mr. Yann Donjoux (CERN) on the e-Ship++ radiological transport assistant application in Nucleonica.
A special session was devoted to gamma spectrometry tools including the Gamma Spectrum Generator, Gamma Library, Cambio and WESPA. The latter tools (Cambio and WESPA) were used for the identification nuclear and radioactive materials.
In total, 11 persons took part in the course from CERN.
Speakers included Mr. Y. Donjoux (CERN) in addition to Dr. J. Magill and Mr. R. Dreher from the Nucleonica team.

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Nucleonica Training Course, KTE, Karlsruhe, 12 April 2018

April 20th, 2018

Introduction to Nucleonica: Core Applications and Tools, 12 April, KTE, Karlsruhe, 2018.
This 1-day course 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 the Radiological Converter, Nuclide Mixtures, Decay Engine++, and Dosimetry and Shielding H*(10). The new e-Learning centre to support the Nucleonica applications was described.
In total, 10 persons took part in the course from KTE.
Speakers included Dr. J. Magill and Mr. R. Dreher from the Nucleonica team.

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SSL secure access active again

April 9th, 2018

SSL secure access has been reactivated.
Access to Nucleonica again available now through https://nucleonica.com.

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