Yikes. perhaps I should stop picking boletus? Are other fungi potentially sequestering radioactive compounds? Also, when I think of the word forensic, I think science for the purpose of deducing crime. When I think Cesium, I think Fukushima. Are you seeing the nuclear disaster as a criminal act?
nowadays the gaze is forensic: the pigments of Boletus, for example, can sequester 137-cesium.
I'm quite familiar with the Mountain Pine Beetle epidemic and it's fungal connection in my province, but not the California statistics. In B.C., those numbers would be rather small, I would think.
We may as well mention that bark beetles can transmit fungal pathogens to trees. Is this correct: 29 million dead in California?