File:Photon Mass Attenuation Coefficients.svg

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Summary[edit]

Description Photon Mass Attenuation Coefficient for photons in energy range from 1 keV to 20 MeV for Elements Z = 1 to 100. Based on [1]. Also shown are locations of photons absorption edges (and not Compton edges as mentioned in the comments from the Matlab code).
Date
Source Own work
Author Jarekt
Other versions PNG version of the same image can be found at Image:Photon Mass Attenuation Coefficients.png.
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This diagram was created with MATLAB.
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Source code
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MATLAB code

figure
Z = 1:100;  % elements with Z in 1-100 range - number of columns
nr = 500;   % number of rows to use in the plot
E = logspace(log10(0.001), log10(20), 500);  % define energy grid
[mac, CEdge] = PhotonAttenuationQ(Z, E);
colormap(jet(128)) % use hi-res color palette
imagesc(log10(mac)); 
grid on;
axis xy; % put small numbers on y axis on the bottom
title('Photon Mass Attenuation Coefficients (in cm^2/g) and Compton Edges');
xlabel('Atomic Number of Elements');
ylabel('Energy in MeV');
% Add X-Axis 
EPos = [6 16 26 35 47 55 65 74 82 94];   % define array to store label location
ELab = { '6-C','16-S','26-Fe','35-Br','47-Ag','55-Cs','65-Tb','74-W','82-Pb','94-Pu'}; %Define Energy labels for y-axis
set(gca,'XTick'     ,EPos);
set(gca,'XTickLabel',ELab);
% Add Y-Axis
ELab = [0.001 0.003 0.01 0.03 0.1 0.3 1 3 10]; %Define Energy labels for y-axis
EPos = size(ELab);   % define array to store label location
for i=1:length(ELab), [tmp EPos(i)]=min(abs(E-ELab(i))); end
set(gca,'YTick'     ,EPos);
set(gca,'YTickLabel',ELab);
% add Colorbar
cbar_axes = colorbar;
set(cbar_axes,'YTick'     ,     -1:4 ); % The image is a log10 of the MAC ...
set(cbar_axes,'YTickLabel',10.^(-1:4)); % ... so add proper labels
hold on
% Add Conpton Edges to the plot
ed = accumarray([CEdge(:,1),CEdge(:,2)],CEdge(:,3)); % get per element energies of 14 compton edges 
ed = 500*(log(ed')-log(0.001))/(log(20)-log(0.001)); % convert energy to row numbers of the image
K=plot(ed(:,1)    ,'m','LineWidth',3); %Plot K Compton edge
L=plot(ed(:, 2: 4),'b','LineWidth',2); %Plot 3 L Compton edges
M=plot(ed(:, 5: 9),'g','LineWidth',2); %Plot 5 M Compton edges
N=plot(ed(:,10:14),'Y','LineWidth',2); %Plot first 5 N Compton edges
legend([K(1),L(1),M(1),N(1)], {'K','L','M','N'}, 'Location', 'NorthWest');
plot2svg('Photon_Mass_Attenuation_Coefficients_.svg')

With help of two external libraries:

  1. PhotonAtenuattion2
  2. Plot2SVG archive copy at the Wayback Machine

Licensing[edit]

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File history

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Date/TimeThumbnailDimensionsUserComment
current02:10, 1 October 2007Thumbnail for version as of 02:10, 1 October 2007600 × 400 (64 KB)Jarekt (talk | contribs)
17:07, 26 September 2007Thumbnail for version as of 17:07, 26 September 2007512 × 330 (64 KB)Jarekt (talk | contribs){{Information |Description={{en|Photon '''Mass Attenuation Coefficient''' for photons in energy range from 1 keV to 20 MeV for Elements Z = 1 to 100. Based on http://physics.nist.gov/PhysRefData/XrayNoteB.html}} |Source=self-made |Date=9/27/2007 |Auth

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