To summarize what we know about radiation regarding DPI
From the Case Files
Vol.1, 370-377: Ivanov ordered to perform radiation testing of clothing and parts of bodies of 4 dead hikers. The testing was performed by expert Levashov. Contamination of the clothing by some radioactive material (beta emitter) was detected.
Vol.2, 21: Ivanov inserted results of Levashov’s radiation testing in the first version of the Case Resolution statement. Prosecutor Klinov stroke it out and did not put his signature on the sheet 18.
Vol.1, 369: Ivanov removed results of Levashov’s radiation testing from the case files (sheets 370-377) and put them into separate package.
Vol.1, Receipt: Ivanov transferred directions from his boss Klinov to the Prosecutor’s office archive worker to keep the package in top secret proceedings section in a secret archive.
Beyond the Case Files
Ivanov’s interview to Bogomolov:
“- I only managed to conduct a radiation examination. Even had to carry on location a device in a large wooden box.
- Geiger counter?
- Yes, it looks like it. It was clicking a lot... I am sure there was radiation. But nobody told me how much, and I didn't find out.”
Mr.Kikoin’s son recollections:
“As far as I can remember, my father took some equipment with him, especially since radiation physics was one of his specialties. Unfortunately, I don't have any detailed information about what kind of device it was. I was 14 years old at the time, so my education wouldn't have been sufficient to ask my father the right question. Additionally, he was bound by a non-disclosure agreement and didn't share any information with his family.”
P.Bartolomey’s investigation (Bartolomey was in Kikoin’s group at the Pass):
“The famous physicist Abram Konstantinovich Kikoin investigated radiation level at the place of death of the hikers. He was also a head of the mountaineering section at UPI, a physics teacher, PhD. Kikoin flew there with the most advanced radiometer of that time, developed by Yuri Stein, also a graduate of UPI. Although that radiometer was quite bulky, it was considered to be very efficient. It was used in 1957 to measure radiation at the site of the famous accident at the Chelyabinsk Mayak.”
E.Okishev’s interview:
“There was one event that put us on alert. When the last bodies were found in May, an order came to collect all items found at the pass and send them for radiological examination. Also, all people who had been in contact with the things found in the tent and nearby were ordered to undergo test for radiation of their bodies. So it was done, but neither a reassuring, nor any other results were made known to us.”
...
“We sent a letter signed by prosecutor Klinov to either Prosecutor General of the USSR or Prosecutor General of Russian Federal republic – I don’t remember exactly now – asking to explain what really we were investigating into? And how it was related to radiation? ”
V.Korotaev’s interview:
“Well, what else alarmed me: when autopsies of the Ravine 4 were performed, there were two vats of ethanol, and we had to submerge into the ethanol on completing each step. Then, after the case was closed, prosecutor Tempalov was given a free coupon to the medical recreation center at the South. He advised me to undergo medical examination too. He hinted that I might become an impotent.”