Gamma-background Bulletin

A permanent gamma-background monitoring is implemented by 5 authorities on the territory of Republic of Bulgaria:

• Executive environmental agency to the MEW maintains the National automatic system for continuous monitoring of gamma-background (BULRaMo system);
• An one-point background measurement is implemented within the National centre of radiobiology and radiation protection – MH;
• General directorate “Civil protection” to the MI receives data from the gamma-background measurements, performed in 335 posts, located within the municipal administrations and from other 28 posts, located within the district administrations.
• Kozloduy NPP performs gamma-background measurements by the Automated information system for off-site radiation control (AISORC) which is incorporated within the BULRaMo system.
• Institute for Nuclear Research and Nuclear Energy (INRNE) to the BAS performs measurements at Mussala peak and at 7 points on the territory of the INRNE and the research reactor.

The measurements results are summarized in the NRA. The data for the last 24 hours show that the gamma-background values in Bulgaria are within the limits of the natural background variations, typical for the corresponding sites.

Excerpt from the averaged values of the gamma-background in the country by 11:00 on 23.05.2013 for the last 24 hours.

	station	µSv/h
	Sofia	0.11
	Varna	0.08
	Plovdiv	0.13
	Pleven	0.07
	Russe	0.06
	Veliko Tarnovo	0.06
	Petrohan	-
	Emine	0.10
	Oryahovo	0.07
	Novi Han	0.10
	Kozloduy	0.11

  * For the territory of the Republic of Bulgaria the natural gamma-background is from 0.06 to 0.40 µSv/h.