DYATLOV PASS

Radiological Analysis Report

31-03-2018

Conclusion of the expert

Sheet 371

I here by testify that I have been warned about the responsibility under articles 92 and 95 of the Criminal Code of the RSFSR
(Signature of Levashov) 18.V.1959

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Reference

In the Certificate of Examination all objects of investigation are numbered from №1 to №4. I.e:

№1 Kolevatov
№2 Zolotaryov
№3 Thibault Brignoles
№4 Dubinina
 
As in the autopsy reports.
 
Signature (Ivanov)

Sheet 372

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Conclusion

Samples of solid biosubstrates and clothes combined in groups under Nos 1, 2, 3,4 were submitted to the radio-isotope laboratory of the Sverdlovsk sanitaryepidemic station and were analyzed for presence of radioactive materials.
Dosimetric measurements of clothes showed excessive radioactivity (Betaemission only, no Alpha or Gamma-quanta) of 200–300 counts per minute (cpm) over the natural background. Further investigation allowed maximum contamination to be established on different spots of clothing:

  1. Brown sweater from №4: 9900 cpm on 150 cm2
  2. Bottom part of bloomers from №1: 5000 cpm on 150 cm2
  3. Belt of sweater from №1: 5600 cpm on 150 cm2

Table №2 shows the contamination of various types of clothing (see on the back).

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Table №2

Contamination of clothes

Description Area cm2 Total cpm Radioactivity of
contaminated area
Radioactivity of
contaminated area
in terms of 150 cm2
1 Soil from №1 - 96 - -
2 Waistband from №1

(after washing)
70 384
300
244
218
2600

1280
5600

2700
3 Bottom part of trousers from №1

(after washing)
55 297
265
210
184
1840

970
5000

2600
4 from №2

(after washing)
60 182
160
182
163
820

560
2000

1400
5 Sheepskin jacket from №2
(after washing)
60 176
156
770
370
1920
940
6 Bottom part of trousers №3
(after washing)
66 120 11 270
100
600
230
7 Jacket from №4
(after washing)
88 210 77 1070
690
1800
1160
8 Leggings from №4 (after washing) 77 164
140
660
360
1280
700
9 White sweater from №4
(after washing)
63 185
163
850
560
1840
1340
10 Brown sweater from №4
(after washing)
75 640
390
4900
2600
9900
5200

 

Recalculation was performed on the B-2 installation in a lead house with a cassette counter STS-6 in the number of 4 pieces.

Conversion factor
installations B-2 k = 8.9;
background in lead house (before washing) 90 pulses/min;
background in lead house (after washing) 100 pulses/min.

Sheet 373

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Experimental washing of the clothes showed that the pollution is reduced, the percentage of decreasing varies from 30% to 60% (clothes were washed in running cold water for 3 hours).
When determining the type of radiation, it is established that the activity takes place due to beta particles. Alpha particles and gamma quanta were not detected. The absence of appropriate instruments and conditions in the laboratory made it impossible to perform radiochemical and spectrometric analysis to determine the chemical structure of the emitter and its radiation energy.
Radiometric measurements of solid biosubstrates were carried out at the B-2 facility (№ 2554) in a lead house with a BFA-25 meter.
The unit was measured using a strontium preparation with an activity of 1) 7000 rpm, 2) 2000 rpm.
The results of measurements of samples from №1, 2, 3, 4 are summarized in Table №1 (see on the back)

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Table №1

Description Sample
mass, g
Raw sample
mass, g
Ash mass,
g
Background,
imp/min
Excess over
background, cpm
Sample
activity, cmp
Sample
activity, curie/kg
1 Intestine №1 0.2 24.42 0.670 23 3 2000 0.9*10-9
2 Liver №1 0.2 19.130 0.690 22 3 3000 1.35*10-9
3 Brain №1 0.2 42.820 0.710 26 4 1850 0.85*10-9
The
4 Heart №1 0.2 8.500 1.300 24 2 8400 3.8*10-9
5 Skin №1 0.25 1.400 0.025 24 - - -
6 Intestines №2 0.2 20.470 0.350 23 6 2800 1.25*10-9
7 Liver №2 0.2 13.590 0.480 29 6 5800 2.6*10-9
8 Brain №2 0.2 41.00 0.840 26 4 2200 1.0*10-9
9 Stomach №2 0.2 24.460 0.480 29 3 1600 0.85*10-9
10 Breastbone №2 0.2 4.170 0.740 24 - - -
11 Breastbone, rib №2 0.2 4.300 0.390 24 - - -
12 Thigh skin №2 0.022 6.500 0.300 24 - - -
13 Intestines №3 0.2 21.770 0.740 23 3 2800 1.25*10-9
14 Liver №3 0.2 33.00 0.920 20 6 4600 2.0*10-9
15 Kidney №3 0.08 10.10 0.080 26 - - -
16 Skin №3 0.014 1.150 0.040 24 - - -
17 Breastbone №3 0.2 7.200 1.300 24 - - -
18 Intestines №4 0.058 14.10 0.100 23 - - -
19 Liver №4 0.2 18.830 0.490 34 7 5000 2.2*10-9
20 Kidney №4 0.2 18.470 0.330 27 4 2000 0.9*10-9
21 Skin № 4 0,091 11.910 0.100 27 4 900 0.4*10-9
22 Thigh skin №4 0.2 7.600 0.280 24 2 2000 0.9*10-9
23 Shin skin №4 0.1 3.840 0.150 24 - - -
24 Heart №4 0.2 12.720 0.350 24 4 3000 1.4*10-9
25 Rib №4 0.177 1.300 0.180 24 - - -

 

Set conversion ratio = 5.5

Sheet 374

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The results of the measurements from the control samples are summarized in Table №3 (see below)

Table №3

Control samples

Description Sample
mass, g
Raw sample
mass, g
Ash mass,
g
Background,
imp/min
Excess over
background, cpm
Sample
activity, cmp
Sample
activity, curie/kg
1 Lung 0.2 23,100 0.700 24 +3 2500 1.1*10-9
2 Kidney 0.2 30.200 0.920 24 +1 - -
3 Liver 0.2 26.030 0.960 24 +1 - -
4 Heart 0.2 19.640 0.950 24 +6 8000 3.6*10-9
5 Skin 0.2 28.200 0.690 24 +3 2000 0.9*10-9
6 Rib 0.2 13,.800 1.180 24 +2 4700 2.1*10-9

 

Forensic medical expert Dr. Vozrozhdenny obtained control samples of tissues of a person who died in motor vehicle accident in Sverdlovsk. The presence of the natural radiological element Potassium-40 was in approximately the same amounts as in Table №1.

Thus, the results of the studies in Tables 1 and 3 do not exceed the averaged data on the content of radioactive substances in human organs and may be due to

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natural radioactive Potassium-40. Radiation by type refers to Beta particles. Alpha particles and gamma quanta are not detected.

Conclusions:

  1. The content of radioactive materials in analyzed solid biosubstartes is within the natural level (and is due to the presence of isotope K-40).
  2. The analyzed samples of clothing carry slightly excessive amounts of radioactive substances being the source of Beta-emission.
  3. The detected radioactive materials or radioactive substance show a tendency to washing-off in the course of clothing samples washing, i.e., they are not due to a neutron flux or induced radiation, but rather to radioactive contamination with Beta-particles.

Chief radiologist of the city of Levashov 27.05.1959 (Signed)

The studies were performed in the radiological laboratory from 18/V-59 to 25/V-59.

Sheet 375

Additional questions to the expert:

  1. Should there be (can it be) increased contamination of clothing with radioactive substances under normal conditions, i.e. without being in a radioactively contaminated environment or place?
    Answer: Definitely not.
     
  2. Was there any contamination of the objects you are researching?
    Answer: As stated in the conclusion, there is a contamination of radioactive substances (substance) by the beta emitters of individual, selectable areas of clothing, sent samples. Thus, for example, the cut from №4 - the brown sweater at the time of the study had 9900 beta-particles decays per minute at 150 cm2, and after washing (for 3 hours in our room), he gave 5,200 decays per minute of beta particles with 150 cm2. For example, according to the sanitary rules that exist in our country, the contamination in beta particles from 150 square centimeters per minute should not exceed 5000 cleavages (washing), and after cleaning (washing) there should be a natural background, e. as much as it gives cosmic radiation to all people and all objects in a given locality, this is the norm for workers with radioactive substances.
    Piece from №1 - the waistband of the sweater shows up to wash 5600 decays, and after washing - 2700. The bottom of the trousers from №1 shows 5000 decays before washing and 2600 after washing.
    In your data it is indicated that all these objects were in the flowing water for a long time before the study, i.e. have already been washed.
     
  3. Is it possible to consider that this clothing is contaminated with radioactive dust?
    Answer: Yes, clothes are contaminated or radioactive dust dropped from the atmosphere, or this garment has been exposed to contamination when working with radioactive substances, or on contact. This pollution exceeds, as I have already indicated, the norm for persons working with radioactive substances.
     
  4. What do you think, what could be the degree of contamination of individual objects, if you take into account that prior to research they had been in the running water for about 15 days.
    Answer: It can be assumed that the contamination of individual garments was many times greater, but here one must take into account that clothes could be washed unevenly, that is, with varying degrees of intensity
     

Expert: chief radiologist of the city of Levashov (Signed) 05/29/1959

Sheets 376, back, 376, back are the originally handwritten and signed documents summarized in the typed copy on sheet 375

 

 

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