Window All Channels

The Window Spectral Radiometric Data option (RPSWINDOW GX) extracts the Region Of Interest (ROI) windows for K, U, Th, Total Count and Cosmic radiation from spectral radiometric data stored in an array channel.

Window Spectral Radiometric Data dialog options

Spectral data channel

The name of the array channel that contains the spectral radiometric data.

Script Parameter: RPSWINDOW.DATA

K start

end

The start and end points for the Potassium window. On a Picodas spectrometer, these are normally 117.0 and 135.0. This data will be placed in a channel named "K_raw".

Script Parameter: RPSWINDOW.K0 and .K1

U start

end

The start and end points for the Uranium window. On a Picodas spectrometer, these are normally 142.0 and 160.0. This data will be placed in a channel named "U_raw".

Script Parameter: RPSWINDOW.U0 and .U1

Th start

end

The start and end points for the Thorium window. On a Picodas spectrometer, these are normally 206.0 and 241.0. This data will be placed in a channel named "Thraw".

Script Parameter: RPSWINDOW.TH0 and .TH1

Total count start

end

The start and end points for the Total count window. On a Picodas spectrometer, these are normally 35.0 and 241.0. This data will be placed in a channel named "TC_raw".

Script Parameter: RPSWINDOW.TC0 and .TC1

Cosmic start

end

The start and end points for the Cosmic window. On a Picodas spectrometer, these are normally 255.0 and 256.0, which is the data stored in the last channel. This data will be placed in a channel named "Cosmic_raw".

Script Parameter: RPSWINDOW.COS0 and .COS1

Application Notes

The input spectral data channel exists as one array channel within the database, normally a 256 channel array channel. Within that channel a number of spectral channels or windows exist. For example, the radiometric spectrometers typically output 256 spectral channels. Each spectral channel corresponds, in this case, to the number of gamma rays detected with energy levels falling within a pre-determined range. Historically, radiometric processing has been carried out on predefined regions of interest (ROIs), namely potassium (K), uranium (U), thorium (Th) and total count (TC), each of which span a number of spectral windows. The lower and upper limits of an ROI are defined in terms of the spectral channels. The first channel is 0 and, in the case of a 256 channel spectrometer, 255 is the last.

When extracting single spectral channels, such as COSMIC, which is usually located in the last spectral channel (255), LOWER would be defined as 255.0 and UPPER as 256.0.

You should consult your spectrometer specifications to determine the optimum windows for your spectrometer. The default window limits noted above are typical for a Picodas spectrometer.

The output windowed data will be the simple sum of values in the specified windows of the input spectral data. Fractional windows may be specified to account for spectral drift if required.

If the output channels do not exist, they will be created using the data type of the input spectral data.

This dialog will call the Window a Single Channel to perform the windowing for each channel. If a script is recorded, the Window a Single Channel definitions and GX can be removed before using the script.

Other channels can be extracted using the Window a Single Channel, which follows this option in the RPS menu.