Column heading explanations for 1_Spatial_dataset.csv
Column heading	Explanation	Units	Notes	
Code	Database serial number - unique ID	n/a	n/a	
Identifier	UIAR unique label - chemical analysis number	n/a	n/a	
Latitude	Location of sampling site 	Decimal degrees	Coordinates determined using the satellite GPS receivers (Trimbl Navigation Scout Master GPS and MAGELLAN NAV DLX-10) in   WGS-84 (World).  Accuracy of the GPS-receiver was about 100 m with a systematic deviation of about 300 m.	
Longitude	Location of sampling site 	Decimal degrees	Coordinates determined using the satellite GPS receivers (Trimbl Navigation Scout Master GPS and MAGELLAN NAV DLX-10) in WGS-84 (World).  Accuracy of the GPS-receiver was about 100 m with a systematic deviation of about 300 m.	
ADR	Absorbed dose rate at one metre height	micro Gray per hour (mGyh-1)	Certified dosimeters DRG-01T	
Hr	Hydrolytic acidity determined using the Kappen method (GOST 26212-91)	milligrams equivalent of H+ per 100grams dry soil	http://docs.cntd.ru/document/gost-26212-91 	
Ca	Exchangeable calcium in soil GOST 26487-85	milligrams per 100 grams soil	http://docs.cntd.ru/document/gost-26487-85 	
pH_KCl	Salt extracted soil acidity represented as dimensionless algorith of concentration of H+ ions GOST 26483-85	n/a	http://docs.cntd.ru/document/gost-26483-85 	
pH_H20	Water extracted soil acidity determined GOST 26423-85	n/a	http://docs.cntd.ru/document/gost-26423-85 	
P2O5	Mobile phosphorus content in soil	milligrams per 100 gram soil		
K2O	Mobile potassium content	milligrams per 100 gram soil	http://docs.cntd.ru/document/gost-26207-91  	
Humus	Organic matter content GOST 26213-91 	Percentage	http://docs.cntd.ru/document/gost-26213-91	
Soil_type	using USSR countries classification (including Ukraine) in accordance with FAO/UNESCO system		Stolbovoi, V. 2000. Soils of Russia: Correlated with the revised legend of the FAO soil map of the world and world reference base for soil resources. IIASA Research Report. IIASA, Laxenburg, Austria: RR-00-013  http://pure.iiasa.ac.at/6111	
Note	Habitat type	n/a	n/a	
Date_of_activity_measurement	Date of measurement 	dd-mmm-yy	n/a	
137Cs	Terrestrial density_of_soil_contamination_with 137Cs 	kilo bequerels per metre squared (kBq_m-2)	Gamma spectrometry measurements were performed using HPGe-detectors, of 30 % relative efficiency and 1.90 keV FWHM for 1333 keV (GEM-30185, EG&G ORTEC, USA).	
Relative_uncertainty_137Cs_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		
134Cs	Terrestrial density_of_soil_contamination_with 134Cs 	kilo bequerels per metre squared (kBq_m-2)	Gamma spectrometry measurements were performed using HPGe-detectors, of 30 % relative efficiency and 1.90 keV FWHM for 1333 keV (GEM-30185, EG&G ORTEC, USA).	
Relative_uncertainty_134Cs_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		
154Eu	Terrestrial density_of_soil_contamination_with 154Eu 	kilo bequerels per metre squared (kBq_m-2)	Gamma spectrometry measurements were performed using HPGe-detectors, of 30 % relative efficiency and 1.90 keV FWHM for 1333 keV (GEM-30185, EG&G ORTEC, USA).	
Relative_uncertainty_154Eu_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		
90Sr	Terrestrial density_of_soil_contamination_with 90Sr 	kilo bequerels per metre squared (kBq_m-2)	The activity of 90Sr was determined using a radiochemical method (Pavlotskaya, 1997) with treatment of the samples by boiling in 6M nitric acid for four hours.	
Relative_uncertainty_90Sr_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		
Date_of_Pu_measurement	Date of Pu measurement 	dd-mmm-yyyy		
238Pu	Terrestrial density_of_soil_contamination_with 238Pu 	kilo bequerels per metre squared (kBq_m-2)	For determination of plutonium radioisotopes at a given site, one of the homogenized 100 cm3 samples was used. After heating at 450 °C overnight, the samples were boiled for 4 hours in 6M HNO3. Plutonium radioisotopes were extracted by a standard radiochemical method (Pavlotskaya, 1997). Activities on the plates were measured using a Soloist alpha-spectrometer equipped with a Soloist-U0300 detector (EG&G ORTEC, USA).	
Relative_uncertainty_238Pu_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		
239+240Pu_kBq_m-2	Terrestrial density_of_soil_contamination_with 239+240Pu
	kilo bequerels per metre squared (kBq_m-2)	For determination of plutonium radioisotopes at a given site, one of the homogenized 100 cm3 samples was used. After heating at 450 °C overnight, the samples were boiled for 4 hours in 6M HNO3. Plutonium radioisotopes were extracted by a standard radiochemical method (Pavlotskaya, 1997). Activities on the plates were measured using a Soloist alpha-spectrometer equipped with a Soloist-U0300 detector (EG&G ORTEC, USA).
	
Relative_uncertainty_239+240Pu_%	Relative uncertainty of determination (at 95% confidence interval)	Percentage		

References
Kashparov, V. A., Lundin, S. M., Khomutinin, Yu V., Kaminsky, S. P., Levtchuk, S. E., Protsak, V. P., Kadygrib, A. M., Zvarich, S. I., Yoschenko, V. I. and Tschiersch, J.: Soil contamination with 90Sr in the near zone of the Chernobyl accident. Journal of Environment Radioactivity, 56, (3) 285-298, 2001. 
Kashparov V. A.: Hot Particles at Chernobyl, Environmental Science and Pollution Research, 10, 1, 21-30, 2003.
Kashparov V.A., Lundin S.M., Zvarich S.I., Yoschenko V.I., Levtchuk S.E., Khomutinin Yu.V., Maloshtan I.N., Protsak V.P. Territory contamination with the radionuclides representing the fuel component of Chernobyl fallout  //The Science of The Total Environment, vol.317, Issues 1-3, 2003, pp. 105-119.
Pavlotskaya, F.I.: Main principles of radiochemical analysis of environmental objects and methods of measurements of strontium and transuranium elements radionuclides. Journal of analytical chemistry, 52 (2), 126-143. (In Russian), 1997.