Help:Nuclide Search / Radiation Search

From NucleonicaWiki
Jump to: navigation, search

Level: Introductory, Intermediate

Contents

Nuclide Search / Radiation Search Application

The Nuclide Search / Radiation Search application in Nucleonica can be used to search the the latest internationally evaluated nuclear data. Nucleonica has created relational databases using the international evaluated European and US nuclear datafiles JEFF3.1 and ENDF/B-VII.1 respectively. These relational databases allow for very fast and user friendly searches.


In summary, the JEFF-3.1 database contains energies and emission probabilities on:

nuclides: 3896

gammas and x-rays: 54004

alphas: 1294

beta-: 8240

ec/beta+: 7059


The ENDF/B-VII.1 database contains energies and emission probabilities on:

nuclides: 3821

gammas and x-rays: 85899

alphas: 1482

beta-: 9708

ec/beta+: 9377


With the above Nucleonica databases, the following searches can be performed:

  • Nuclide Search
  • Radiation Search
  • Advanced Search


Using the Nuclide Search / Radiation Search application

Accessing the Nuclide Search / Radiation Search application

The Nuclide Search / Radiation Search application can be accessed from the main Nuclear Science application centre or from the Applications drop-down menu (shown below). Alternatively the Nuclide Search / Radiation Search application can be accessed via the Nuclide Search / Radiation Search quick links shown in the right hand column in the figure.

Accessing the Nuclide Search / Radiation Search application


Nuclide Search

Nuclide Search and results


In the example shown, the selected Nucleonica database (JEFF-3.1) is searched for nuclides of Cs which have a half-life in the range 1 hour – 10 years. In the Table Display Options, check box selection determines which additional information is shown in the results grid. By clicking on the Search button, 10 results from 7 Cs nuclides are returned. The results grid shows the nuclides, decay modes, half-lives, spin, parity, daughter nuclide, branching ratio and Q-value.

The databases can be searched for stable/primordial nuclides and isomers. In addition, a search can be made on the decay mode. By ticking the check-box Decay Mode a small window opens showing all the decay modes possible in Nucleonica. The decay mode(s) of interest can then be selected. For more information, see Filter decay mode.

Once the input mask has been setup (with atomic number, element, mass number, half-lives etc.), together with the Table Display Options, and the results obtained, these settings are saved for later use. The values in the input mask can be cleared at any time using the Clear button.

The results shown in the output grid can be re-ordered by clicking on the column header. In the figure, it can be seen that the results have been arranged by Nuclide. Clicking once more on the Nuclide header will rearrange the results according to decreasing mass number. Similarly, the results can be arranged according to increasing/decreasing decay mode, half-life, spin, parity, daughter nuclide, branching ratio, and Q-value.

Finally, the obtained results can be downloaded as an Excel spreadsheet or as a csv (comma separated values) file to be read by a text editor such as Notepad. Using the csv option, the data entries can be separated by the chosen separator.

Decay mode filter

Decay mode filter


The filter decay mode window can be activated by checking the Decay mode button. The default values are such that all modes are checked. These can be de-activated by unchecking the boxes individually or by unchecking all boxes simultaneously by pressing the "None" button. Thereafter, individual buttons can be checked. With all boxes checked, all possible decay modes are selected.

If only alpha is checked, for example, the search will be performed on only nuclide ground states and metastable states which have alpha emission as the main decay mode. If both alpha and ß- are checked, then the nuclide chart will show all nuclides which have a main decay mode of alpha or ß- emission.

Nuclides - both ground states and metastable states - can have subsidiary decay modes in addition to a main mode. These subsidiary modes can be accessed through the Decay mode button. To perform a search on all nuclides which have a particular decay mode - either as main mode or as subsidiary mode - the user should use the frame "Decay mode", select the mode or modes of interest and press the "Update" button. The results will be shown in the output grid.

Radiation Search

Radiation Search and results


In the figure the results of a radiation search are shown. The search was performed for three gamma lines at 81, 303, and 356 keV with uncertainties of 5, 1 and 2 keV respectively. In addition, only emission probabilities greater than 0.1 are of interest. By clicking on the Search button, eight results from four nuclides are returned. The results table shows the nuclides, gamma and x-ray energies, emission probabilities, and half-lives. By checking the tick boxes in the Table display options, the uncertainties in the energies and emission probabilities can also be shown.

It may be surprising that Rh 107 appears only once in the table. Since in the input mask three energies are specified, one would expect to see three Rh 107 entries corresponding approximately to the three input energies. However, in addition a minimum emission probability of 0.1 has been selected. This selection criteria eliminates two of the Rh 107 energies (since they have emission probabilities less than 0.1). This can be seen more clearly by setting the minimum emission probability to 0. Then all three Rh 107 energies are recovered.

Once the input mask has been setup (with energies, emission probabilities, atomic number, mass number, half-lives etc.) and the resulrs obtained, these settings are stored for later use. The values in the input mask can be cleared at any time using the Clear button.

The results shown in the output table can be re-ordered by clicking on the column header. In the figure, it can be seen that the results have been arranged by increaing atominc number Z. By clicking on the Emission Probability header, for example, the results will be rearranged according to decreasing emission probability. Similarly, the results can be arranged according to increasing/decreasing atomic number, gamma and x-ray energy, and half-life, etc..

Finally, the obtained results can be downloaded as an Excel spreadsheet or as a csv (comma separated values) file to be read by a text editor such as Notepad. Using the csv option, the data entries can be separated by the chosen separator.

Advanced Search

Advanced search and results


In the figure the results of an Advanced Search are shown. The search was performed for nuclides with isotopic powers (heat generated by alpha, beta and gamma radiation) in the range 10-100 W/g. In addition, the minimum half-life should be 2 years. By clicking on the Search button, fourteen results from seven nuclides are returned. The results table shows the nuclides, specific activities, isotopic powers (for alpha, beta and gamma) and hlaf-lives. By checking the tick boxes in the Table display options, additional quantities can be displayed in the results grid.

Once the input mask has been setup and the results obtained, these settings are stored for later use. The values in the input mask can be cleared at any time using the Clear button.

The results shown in the output table can be re-ordered by clicking on the column header. In the figure, it can be seen that the results have been arranged by increaing atominc number Z. By clicking on the isotopic power headers, for example, the results will be rearranged according to increasing isotopic power, etc.

Finally, the obtained results can be downloaded as an Excel spreadsheet or as a csv (comma separated values) file to be read by a text editor such as Notepad. Using the csv option, the data entries can be separated by the chosen separator.

Download

In the figure the results of a search are shown. The results can be downloaded using the settings below the results grid.

Download search results


The results can be downloaded by checking the appropriate radio buttons and then clicking on Download. In the case that the Excel button has been checked, the user can download the results directly into Excel. If the CSV buttom has been selected, the user can download the results into a text file (Comma Separated Values, CSV) using the desired separator. The CSV file can then be viewed with a text editor such as notepad. Alternativley it can be imported into Excel using the Data import feature and the text import assistant.



References

The Nucleonica databases

The international evaluated European and US nuclear datafiles JEFF3.1 and ENDF/B-VII.1

Personal tools
nucleonica premium
Karlsruhe Nuclide Chart