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21.08.95

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28.08.95

29.08.95

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31.08.95

01.07.95

01.07.95

02.07.95

03.07.95

04.07.95

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06.07.95

07.07.95

3

08.07.95

09.07.95

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15.07.95

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20.07.95

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24.07.95

25.07.95

26.07.95

27.07.95

28.07.95

29.07.95

30.07.95

31.07.95

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C

ANNEX 3

«ass

D

ÍD

0

ANNEX 4

UMWELTFORSCHUNGSZENTRUM LEIPZIG-HALLE GMBHSEKTJON ANALYTIK - ABTEILUNG UMWELTRADIOAKTIVITÂT UND -ISOTOPEPermoserstraBe 15, 04318 Leipzig 9 (0341) 2352297 FAX: (0341)2352625

REPORT

Measurement of radionuclides in soil samples from surroundings ofthe test house in Barcelona by gammaspectrometry

Dr.H.C.TreutlerDr. K. Freyer

Leipzig, August 18, 1995

Measurement technique

The sampling was done by the coworkers of Barcelona. There was noinformation about the sample origin (depth, location). The samples were dryedunder 80 °C and milled to a grain size of < I mm. Stones in the samples were notmilled and also not measured. About 100 g of the milled sample material wasfilled in a cylindrical sample container (volume: 108 cm3).The gammaspectrometrical measurements were done using HPGe detector with0.5 mm beryllium window. It has an energy resolution of 570 eV on the level of122 keV. The passive shielding consists of 105 mm lead, 2 mm copper and 4 mmplexiglass. The detector and the measuring geometry were calibrated withcertified reference material RGU-1 and RGK-1 from the International AtomicEnergy Agency (IAEA) and with a calibration mixture solution sold byPhysikalisch-Technische Bundesanstalt Braunschweig, Germany.The gamma spectra were evaluated by the commercial software ,,GAMMAW"(Dr. Westmeier Gesellschaftiur Kernspektrometrie mbH). For the calculation of

4

the specific activities of the determined radionuclides the following y-energieswere used:Th-234: 63.3 keV (3,8%)

Ra-226 was calculated by its daughter nuclidesPb-214: 351.9keV (37.1%)

295.2keV (19.2%)Bi-214: 609.3 keV (46.1%)

1120.6 keV (15.0%)

Pb-210: 46.5 keV (4.05%)

Ac-228: 911.1keV (29.0%) _ _•" 968.9keV (Ï7.0%)

338.4 keV (12.0%)

K^tO: 1460.8 keV (10.7%)

Results

In the table I the specific activities of these radionuclides in the soil samples aresummarized. The radionuclides Th-234, Ra-226 and Pb-210 are members of thedecay chain of uranium-238. Because of the relative short half life time of Th-234 (24.1 d) it is really in radioactive equilibrium with U-238. Therefore it ispossible to calculate the uranium content of the samples (table 2).Ac-228 (half life time: 6.1 h) comes from the decay chain of Th-232. It is thesecond daughter nuclide in this chain after Ra-228 (half life time: 6.7 a). On the

understanding of stable conditions in the sampling region in the last 50 years Ac-228 is in radioactive equilibrium with Th-232 and under this asumption thethorium content of the samples was calculated (table 2).Average uranium concentrations are [1] in- acid igneous 3.0 ug/g,- intermediate igneous 1.5 ug/g,-basic igneous 0.6 ug/g.

Average contents of Ra-226, Th-232 and K-40 are [1] in-igneous Ra-226:48 Bq/kg Th-232:48 Bq/kg- sedimentary sandstones 15 Bq/kg 25 Bq/kg-shales 15 Bq/kg 40 Bq/kg- limestones 15 Bq/kg 5 Bq/kg

K-40: 800 Bq/kg240 Bq/kg800 Bq/kg

80 Bq/kg

Under this point of view the uranium and thorium contents of the measured soilsamples are in the normal environmental level.

[1] M. Eisenbud, Environmental Radioactivity from Natural, Industrial, andMilitary Sources, Academic Press, San Diego, New York ..., 1987.

Table 1: Specific activities of Th-234, Ra-226, Pb-210, Ac-228 and K-40 in soilsamples from the surroundings of the Barcelona test house

sample

AMIAM2AM3AM4BlB2DlD2D3D4D5D6D8F IF2F3JM1JM2JS1JS2L IL2L3PA1PA2RC1*RC1**RC2

mass

tel114,5107,0116,9114,0108,4108,3104,8111,1103,895,0

108,6120,1105,898,5

102,2106,4148,199,6

116,9128,9108,4105,7104,097,3

129,3123,5108,1100,5

det.

2221112221\21121221111

21

._.!212

specific activity [Bq/kg]Th-23439 ±333 ±539 + 920+829 ± 1328± 1037 ± 1330±626 ±336± 1137+ 1331±536+ 1431±929 + 331+1425 + 632 + 7

43+ 1044+ 1022 + 932 + 627+724+ 1022 +.234 + 334 + 931 + 6

Ra-226 133+ 131 + 233 + 318 + 2

25 + 224+ 132 + 331 + 429 + 230 + 333 + 328± 137 + 328 + 230 + 22 7 + 319±231 + 240+ I40 + 213+ I

25 + 227 + 215 + 2

24 + 128+ I31 + 233 + 2

Pb-2 JO35+ 135 ±741 + 516 + 7

32+ 1030+ 1041 + 940 + 238 + 4

35+ 1039 + 434 + 357+ 1036+ !038 + 227 + 619 + 24 0 + 547+745 + 525 + 732 + 734 + 528+823 + 429 + 445 + 8

45 ± 12

Ac-22853 + 241 + 249 + 229+ 139 + 237 + 238±344 + 235 + 239 + 249 + 241 + 259+339 + 240 + 236 + 334 + 237 + 255 + 254 + 221+ 142 + 238+223+ 132+ 145 + 247 + 240 ± 1

K-40

605 + 19506 + 29521 + 28336+ 12495+ 16498+ 18526 + 2 I434 + 23452+ 19483 + 17603 + 17495 ± 20695 ± 2 1456 + 23478+22460+ 14701 + 25518 + 29653+ 18598 ± 16279+ 13563+ 17545 + 28311+15392 ± 10684 + 36589+ 17512 + 20

* 20 cm depth** 100 cm depth

Table 2: Uranium and thorium contents of the soil samples

sample

AM1AM2AM3AM4B1B2D1D2D3D4D506D8F1 'F2F3JM1JM2JS1JS2L1L2L3PA1PA2RC1*RC1"RC2

conteruranium3.2 + 0.22.7 + 0.43.2 + 0.71.6 + 0.62.3+ 1.12.3 + 0.83.0+ 1.12.4 + 0.52.1 + 0.22.9 + 0.93.0+ 1.12.5 + 0.42.9+ 1.12.5+ 1.12.3 + 0.22.5+ 1.12.0 + 0.52.6 + 0.63.5 + 0.83.6 + 0.81.8 + 0.72.6 + 0.52.2 + 0.61.9 + 0.81.8 + 0.22.8 + 0.22.8 + 0.7

" 2.5 + 0.5 " ̂

* [pg/g]thorium

13.1 + 0.510.1 + 0.512.1 + 0.57.2 + 0.29.6 + 0.59.2 + 0.59.4 + 0.7

10.9 + 0.58.7 + 0.59.7 + 0.5

12.1+0.510.1 + 0.514.6 + 0.79.6 + 0.59.9 + 0.58.9 + 0.78.4 + 0.59.2 + 0.5

13.6 + 0.513.4 + 0.55.2 + 0.2

10.4 + 0.59.4 + 0.55.7 + 0.27.9 + 0.2

11.1 + 0.511.6 + 0.599 + 0:2""""

* 20 cm depth ** 100 cm depth