That's a beautiful rendition Charles, I love it. Maybe some day I can do that conversion too.
Charles, it's not so much does it have Nb, it's can we use the natural radiation to prove it has Nb..... This is just a bad spot in the spectrum to be looking for weak Nb peaks when the natural radiation is literally filling the area with peaks. Lanthanide series Ka will no doubt fare much better. The picture is of Uranium Sulfate (no lower daughters) done on my Si-PIN detector - the blue tinted area is centered on poor little niobium's 16.61 peak compared to the massive Thorium etc. peak centered on 16.20.
If this were an AM radio dial instead of a gamma spectrum, radio station WNb at 1661 KHz would never be heard over the mighty clear-channel station WTh at 1620 KHz. His two choices would be to increase his power by 20dB or move up the dial to a less busy channel.
-30- 10-4 73 et SK (radio talk)
Geo
