Dosimetry certification of Ukraine - 2011

Results of Dosimetry certification of Ukraine in 2011 has been published at the website of the Ministry of Emergency Situations of Ukraine (MES). For comfort view the results also are presented as an interactive Google map using a Mediawiki based web application (see here). A brief analysis of the certification is also conducted there.

Dosimetry certification of Ukrainian localities, exposed to radioactive contamination from the Chornobyl disaster (Certification-2011), was conducted pursuant to subparagraph 3 paragraph 1 of the Decree of the President of Ukraine "On measures related to the 25-anniversary of the Chornobyl disaster" to ensure the revision of boundaries of radioactive contamination zones from the Chornobyl disaster based on expert opinion of the National Commission on Radiation Protection of Ukraine (NCRPU), the National Academy of Sciences of Ukraine (NASU), the respective central authorities.

To fulfill Certification-2011 MSE was appointed as a main customer  According to MSE in the certification of 2011: 1,971 localities (from 2163 localities that are subject of the dosimetry certification) were surveyed, 13 785 samples of milk and 10 330 samples of potato were collected and measured for ¹³⁷Cs content, ¹³⁷Cs body content in 58 515 individuals of 814 localities was measured using whole body counters (WBC).

In total, according to Cabinet Decree of July 23, 1991 No.106, categories of zones 2, 3 and 4 were assigned to 2163 localities. The 2-th zone includes 50 localities  the 3rd - 830, and the 4 th - 1283. All the localities are distributed over 73 districts (rayons) of 12 regions (oblasts) of Ukraine with the total population of not less than 2 million 247 thousand people.

Statistical analysis of certification-2011 and comparison with previous certification of 2006 confirms the general trend of public annual exposure reduction. So Table 1 presents data on zoning of localities under Cabinet Decree of July 23, 1991 No.106 and distribution of number of localities (NoL) over the radioactive contamination zones according to dosimetry certifications performed in 2006 and 2011.

TABLE 1. Distribution of number of localities (NoL) over the radioactive contamination zones according to criteria established by the Law of Ukraine, and as results of dosimetry certifications performed in 2006 and 2011.

Dose range, mSv/year	Decree of Cabinet No 106 of 23.07.1991			Certification - 2006		Certification - 2011
zoning		%	NoL	%	NoL	%	NoL
0.5	no restriction	0.0	-	82.0	1817	90.0	1967
0.5 - 1.0	4	59.3	1283	14.3	275	8.3	165
1.0 – 5.0	3	38.4	830	3.7	71	1.7	31
> 5.0	2	2.3	50	0.0	0	0.0	0
ВСЬОГО		100.0	2163	100.0	2163	100.0	2163

Sources:

• wiki.urps.info (detailed Certification-2011 data analysis and an interactive map based on Google Maps)
• mns.gov.ua (report with initial tabular data)

Read more on:

• Results of dosimetry certification of Ukraine - what next? (of 2006-2008)
• Scientific review the ongoing consequences of the Chornobyl disaster
• Proposals for revising the list of localities of Ukraine subjects of radioactive contamination zones (of 2006-2008)
• Formation of external exposure in the Chornobyl exclusion zone and adjacent areas (of 2006-2008)
• Dosimetry certification of Ukraine: internal exposure verification  (of 2006-2008)