145Indoor radon activity concentration [Bq.m -3 ]8070605040302010One liter scintillation chamberAlphaGUARD monitor014.IV.07 15.IV.07 16.IV.07 17.IV.07DateFig. 7 The courses of the 222 Rn activity concentration measured by one liter scintillation chamber andAlphaGUARD monitorTab. 1 Detection limits of radon monitors for 2 h counting period and 30% statistical uncertaintyMonitor AG SCH 1L LSCHDetection limit [Bq·m –3 ] 4.6 5.1 2.9The detection limits of radon monitors for2-hour counting period and 30 % statistical uncertaintyare shown in Tab. 1. As can be seen the highestsensitivity has the monitor built on the basisof the large scintillation chamber. The sensitivitiesof other two monitors are mutually comparable.Compactness and high sensitivity are advantageousfeatures of the AlphaGUARD monitor butmonitors based on scintillation chambers are betteradaptable for different conditions of radon measurements.CONCLUSIONWe built two radon monitoring systems on thebasis of scintillation chambers and compared theoperation of three continuous radon monitoringsystems in the real conditions. The results of testsshow that the records of radon activity concentrationsof all three monitors are very similar andaverage values of radon concentrations calculatedon the basis of the measured data are identical inthe scope of counting errors. Moreover, it was foundout that AlphaGUARD provides radon activityconcentrations a few percent higher in minimum ofdaily radon variations than other two monitors. Allthree monitors can be successfully used for solvingdifferent problems of radon diagnosing of inhabitedbuildings starting from the level of radon concentrationof some Bq·m –3 .AcknowledgmentsThe authors would like to express their thanksfor the financial support of the work to the Ministryof Education of the Slovak Republic (VEGA projectNo. 1/3046/06, ESF project JPD BA 3 2005/1-034)and Comenius University in Bratislava (Grant forJunior Scientists UK/369/2007).REFERENCES1. STANYS, T., HOLÝ, K., BOSÁ, I.: Výsledky kontinuálnehomonitorovania 222 Rn a jeho produktovpremeny <strong>vo</strong> vnútornom ovzduší. In: Zborník 2.Banskoštiavnické dni, ISK Senec. 2001, pp. 96–107.2. BUSIGIN, A., VAN DER VOOREN, A. W., PHIL-LIPS, C. R.: Interpretation of the response of continuousradon monitors to transient radon concentrations.In: Health Physics. 1979, Vol. 37, pp. 659–667.
1463. THOMAS, J. W., COUNTESS, R. J.: Continuous radonmonitor. Health Physics. 1979, Vol. 36, p. 734.4. WARD, D. C., BORAK, T. B.: Determination of time– varying 222Rn concentrations using flow–throughscintillation flasks. In: Health Physics. 1991, Vol. 61,No. 6, pp. 799–807.5. REINEKING, A., BUTTERWECK, G., POR-STENDÖRFER, J., STRONG, J. C., VAN MARCKE,H., VAN DINGENEN, R.: Intercomparison of methodsfor investigating the physical characteristics ofradon decay products in the indoor environment.Rad. Protect. Dos., 1992, Vol. 45, No. ¼, pp. 41–46.6. SAKAMOTO, S., TAKAKURA, H.: Efficiency ofa large scintillation cell. J. of Radioanal. and Nuc.Chem., 1998, Vol. 236, No. 1–2, pp. 257–260.7. GENRICH, V.: AlphaGUARD PQ/MC50 – MultiparameterRadon Monitor, Genitron InstrumentsGmbH, Frankfurt, Germany.8. BELÁŇ, T., CHUDÝ, M., ĎURANA, L., GRGU-LA, M., HOLÝ, K., LEVAIOVÁ, D., POVINEC, P.,RICHTÁRIKOVÁ, M., ŠIVO, A.: Investigation ofradionuclide variations in the Bratislava air. In: PO-VINEC, P., (Ed.) Rare Nuclear Processes. Proc. ofthe 14th Europhys. Conf. on Nuc. Phys. Singapore:World Scientific, 1992, 441 p.
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19are lower in ill patients compare
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26the load during its exposure to f
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28Tradescantia paludosa 02 test and
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30Tab. 5: Results of positive contr
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35DISCUSSIONThe ionising radiation
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39222Rn is produced by radioactive
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41180160140this reason we also pick
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435001450400350hKz0,8h [m]300250200
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46deposit is that stripped in off-l
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48TruenessTrueness was determined i
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50MATERIAL AND METHODSChloroform (p
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52absorbance [a.u.]1,000,750,500,25
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54Tab. 1: Rrequirements determinati
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56Methods of VOC testing were set a
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59Tab. 6: ContinuedSamples withsurf
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63One of the possible explanations
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65Ai - Ai-1 [Bq.m -3 ]86420-2-4-6-8
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69BiodegradabilityThe great variety
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71degradation starts of late days,
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73Fig. 4 Treated (after 28 days of
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75parameters of the cutting process
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79Fraction: D (residual rest) prese
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81was not confirmed. Maximum of mer
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84Fig. 1 Schematic diagram of atomi
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86Alpha spectrometryAlpha spectrome
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8880007000y = 6622xR 2 = 0.939SIMS
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91ACTA FACULTATIS ECOLOGIAE, 16: Su
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93Gemer according to the German mod
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