Archive for November, 2017

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.

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.

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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.

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