One of the things that remains unexplained about the Dyatlov Pass incident is the radioactive substances found on pieces of clothes that Dubinina and Kolevatov were wearing. The expert testimony in the original radiation analysis report makes it clear that the radiation was unusual.
The 1959 analysis included an experiment involving washing the clothes of the hikers — which they found reduced the level of contamination. The expert then emphasized that the bodies were found in running water. Meaning the level of radioactivity detected, which was excessive when the bodies were found, would have been significantly higher at the time of their death.
Check out the original radiation analysis report, along with all of the other case files scanned and translated at DyatlovPass.com, an amazing resource that has compiled many of the original documents related to the case: https://dyatlovpass.com/case-files-371-377?rbid=17743