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A very low level of radioactivity would indicate that most of the pyritic sulphur had been driven off, taking with it the radioactive tags.
From Time Magazine Archive
When he applied ammonia, explained Keller, the raw coal broke down into fine particles, separating the purer hydrocarbons from rock and pyritic sulfur and significantly reducing its ash content.
From Time Magazine Archive
A higher level would show that the organic sulphur had been eliminated, leaving behind the pyritic sulphur.
From Time Magazine Archive
It cannot proceed from the decomposition of sulphurets of iron, or pyritic strata.
From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 by Alexander von Humboldt
Cornish ores are almost entirely pyritic; and indeed it is from such ores that by far the largest proportion of copper is extracted throughout the world.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" by Various
