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The x-ray spectrum is advantageous because its non-destructive and detects elements. Shown is my portable x-ray fluorescence detector which I am just starting to experiment with. It was originally used to detect lead in paint but can produce a spectrum from 10 Kvp to 100 Kvp. This device requires the specimen to be dosed with x-rays in order to work.
Just seeing what's inside lumps of stuff is cool too. This is my portable x-ray generator from Golden Engineering. Have x-rays will travel!
Fossil bones in a clay ball.
Fossil dinosaur egg with something inside. Probably NOT an embryo.
My hand, notice the sliver of steel embedded in the tip of my index finger.