Nova Scotia Token Brass Vs Bronze

XRF
Which token?

Bronze: a copper alloy that usually contains tin, but not zinc.

Brass: a copper alloy that usually contains zinc, but not tin.

Note that the terminology is somewhat flexible. Most "coinage bronze", and the alloy used to make Olympic "bronze medals", is technically a brass. But in general, a "bronze" might contain zinc, but a "brass" won't contain tin.

XRF will tell you if there's any tin present in the alloy, and thus whether it's technically a bronze or a brass. However, for token manufacturers, the exact composition of tokens was not something regulated through government legislation, as it was for coins. They'd have used whatever alloy was cheapest and/or easiest to obtain, which was likely a scrap metal mixture of recycled bronzes and brasses. There may be traces of tin present in coins that ought to be classified as "brass". So for accurate calibration of results, you really need to run three different coins through the XRF: your mystery coin, a coin "known" to be bronze, and a coin "known" to be brass.