T. Kovács1, J. Somlai1, A. Kopek2, G. Szeiler1, G. Pomázi, Z. Sas3,

1University of Pannonia, Institute of Radiochemistry and Radioecology, Veszprém (Hungary)2 Balaton Uplands National Park, Csopak (Hungary)

3 Mecsek-ÖKO Zrt, Pécs (Hungary)4 Social Organization for Radioecological Cleanliness, Veszprém (Hungary)

RADIATION DOSE ORIGINATING FROM RADON RADIATION DOSE ORIGINATING FROM RADON AND RADON PROGENY EFFECTING WORKERS IN AND RADON PROGENY EFFECTING WORKERS IN

THE SHOW CAVE OF TAPOLCA (HUNGARY)THE SHOW CAVE OF TAPOLCA (HUNGARY)

Entrance of the Entrance of the showshow cave cave and the and the loungelounge

The show cave of TapolcaThe show cave of Tapolca

16/2000. (VI. 8.) EüM16/2000. (VI. 8.) EüM

• Personal dosimetry is required (inspite of the sources are terrestrial radioisotopes) in the case of the following workplaces:

• 26.1. Spas, caves (therapy and show caves), underground mines, other underground workplaces

Radon reference level for workplaces:Radon reference level for workplaces:

ICRP 65 (1993): 500-1500 Bq/m3

ICRP 103 (2007): max. 1500 Bq/m3

ICRP (2009): max. 1000 Bq/m3

WHO (2009): max. 1000 Bq/m3

Hungary: max. 1000 Bq/m3

Radon measurements between Radon measurements between 12/03/2003 – 02/10/200312/03/2003 – 02/10/2003..

Average radon activity concentration Average radon activity concentration (kBq/m(kBq/m33))

12/03/2003 – 02/10/200312/03/2003 – 02/10/2003..

• Annual average >1000 Bq/m3

• Aeration is not allowed• Hazardous radiation workplace• Dosimetry required

Annual radon activity concentration in Annual radon activity concentration in the cave and the loungethe cave and the lounge

Monthly average radon activity Monthly average radon activity concentration in the cave and the lounge concentration in the cave and the lounge

(2006 – 2011)(2006 – 2011)

Outdoor temperature dependency of Outdoor temperature dependency of radon concentrationradon concentration

CaveCave

LoungeLounge

Outdoor air pressure dependency of Outdoor air pressure dependency of radon concentrationradon concentration

CaveCave

LoungeLounge

Annual effective dose of workersAnnual effective dose of workers

Thank you for your kind attention!Thank you for your kind attention!