PEŠEK F. (1964): Preliminary report on autoradiographical investigations into the occurrence of natural radioactive substances in fungal fruitbodies. Česká Mykologie 18(4): 232-233 (published: 28th October, 1964) abstract Autoradiography and dosimetry revealed that fungal fruitbodies absorb radioactive elements Sr90 and K40 from the substrate and accumulate them in specific tissues.