Conclusion of the expert
I here by testify that I have been warned about the responsibility under articles 92 and 95 of the Criminal Code of the RSFSR
(Levashov's signature) 18.V.1959
back
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)
- 1 -
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 Sanitary epidemiological 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:
Table №2 shows the contamination of various types of clothing (see on the back).
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 | 120 111 |
270 100 |
600 230 |
7 | Jacket from №4 (after washing) |
88 | 210 777 |
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.
- 2 -
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)
№ | 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
- 3 -
The results of the measurements from the control samples are summarized in Table №3 (see below)
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. Vozrozhdenniy 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
natural radioactive Potassium-40. Radiation by type refers to Beta particles. Alpha particles and gamma quanta are not detected.
Chief radiologist of the city of Levashov 27.05.1959 (Signed)
The study was carried out in a radiological laboratory from 18/V-59 to 25/V-
Additional questions to the expert:
Expert: chief radiologist of the city Levashov (signed) 05/29/1959
Sheets 376, back, 377, back are the originally handwritten and signed documents summarized in the typed copy on sheet 375