Radioisotopes present in building materials of workplaces

Claro, Flávia Del; Paschuk, S.A.; Corrêa, Janine Nicolosi; Denyak, V.; Kappke, Jaqueline; Perna, Allan Felipe Nunes; Martins, M.; Santos, Talita Oliveira; Rocha, Zildete; Schelin, H.R.

doi:10.1016/j.radphyschem.2017.02.037

Cited by 14 publications

(3 citation statements)

References 17 publications

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“…where C eq is the equilibrium radon concentration in Bq m −3 ; V eff is the effective volume of air into the system (taking into account chamber volume, active detector volume, and plastic tubes); C Ra is the activity concentration of 226 Ra in Bq kg −1 measured with gamma spectrometry method and m is sample mass in kg (Del Claro et al 2017).…”

Section: Radon Emanationmentioning

confidence: 99%

The influence of building material structure on radon emanation

Kuzmanović¹,

Miljević²,

Todorović³

et al. 2022

J. Radiol. Prot.

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In this work, the radon emanation coefficients for selected building materials that are most often used in Serbia for covering floor surfaces (concrete, concrete screed, granite, glazed ceramic tiles, marble, roofing tile, and terrazzo tile) were determined, and the influence of the material structure on their values. The concentration of 226Ra activity in the samples was determined using the gamma spectrometry method. Radon emanation was measured with the RAD7 device. The porosity of the samples was tested using mercury intrusion porosimetry and water absorption methods, and the structural analysis was performed using X-ray diffraction analysis and X-ray fluorescence analysis. The measured values of 226Ra activity concentrations were in the range (4.93 – 298) Bq kg-1, and the estimated values of the radon emanation coefficients were in the range (0.55 – 6.05) %. The obtained results indicate that the chemical and mineralogical composition, method of production, and the 226Ra activity concentration have an influence on the emanation of radon from the material. No significant correlation was found between the radon emanation coefficient and the open porosity of the material, most likely due to the inhomogeneous presence of pores of different dimensions in the materials. It was established that the total value of the emanation coefficient depends on the emanation coefficient for pores ≤100 μm in size.

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Section: Radon Emanationmentioning

confidence: 99%

The influence of building material structure on radon emanation

Kuzmanović¹,

Miljević²,

Todorović³

et al. 2022

J. Radiol. Prot.

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“…The exhalation rate is the flux density in the surface of the material. Once the gas can accumulate inside dwellings, it is necessary to determinate the indoor radon-222 activity [11][12][13][14][15], its exhalation from soil [16][17][18][19][20], building materials [21][22][23][24][25][26][27], and objects rich in radium-226 from private and museum collections [28][29][30]. There are several different techniques to determine the emanation factor and the effective radium-226 activity from radon-222 exhalation [18,25,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Determining radium-226 concentration from radon-222 emanation in building materials: a theoretical model

Barreto¹,

Perna²,

Narloch³

et al. 2019

Braz. J. Rad. Sci.

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It was developed an improved theoretical model capable to estimate the radium concentration in building materials solely measuring the radon-222 concentration in a confined atmosphere.This non-destructive technique is not limited by the size of the samples, and it intrinsically includes back diffusion.The resulting equation provides the exact solution for the concentration of radon-222 as a function of time and distance in one dimension.The effective concentration of radium-226 is a fit parameter of this equation.In order to reduce its complexity, this equation was simplified considering two cases:low diffusion in the building material compared to the air, anda building material initially saturated with radon-222.These simplified versions of the exact one dimension solution were used to fit experimental data.Radon-222 concentration was continuously measured for twelve days with an AlphaGUARD detector, located at the Laboratory of Applied Nuclear Physics at Universidade Tecnologica Federal do Parana (UTFPR).This model was applied to two different materials: cement mortar and concrete, which results were respectively (15.7 +- 8.3) Bq/kg and (10.5 +- 2.4) Bq/kg for the radium-226 effective concentration.This estimation was confronted with the direct measurements of radium in the same materials (same sources) using gamma-ray spectrometry, fulfilled at Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), which results were respectively (13.81 +- 0.23) Bq/kg and (12.61 +- 0.22) Bq/kg.

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“…The nat u ral ra dio ac tiv ity lev els and ra don ex hala tion rates in build ing ma te ri als have been a mat ter of con cern in re cent de cades [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this study, (1) the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in the build ing ma te ri als com monly used in the West ern Black Sea re gion of Tur key were mea sured us ing a gamma ray spec trom e ter equipped with a high pu rity ger ma nium (HPGe) de tec tor, (2) the 222 Rn con cen tration and 222 Rn ra don ex ha la tion rates (sur face and mass) of these ma te ri als were mea sured by ac tive method us ing a con tin u ous ac tive ra don mon i tor ing sys tem (AlphaGUARD PQ2000 PRO) with an ac cumu la tion con tainer, and (3) ra dio log i cal risks that may arise from the use of build ing ma te ri als were eval u ated by es ti mat ing their ra dio log i cal pa ram e ters.…”

Section: Introductionmentioning

confidence: 99%

Natural radiation exposure and radon exhalation rate of building materials used in Turkey

et al. 2018

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1 De part ment of Phys ics, Fac ulty of Sci ence and Let ters, Uni ver sity of Kastamonu, Kastamonu, Tur key 2 Mugla Sitki Kocman Uni ver sity, Mugla, Tur key 3 De part ment of Phys ics, Fac ulty of Sci ence and Let ters, Cukurova Uni ver sity, Adana, Tur key 4 Turk ish Atomic En ergy Au thor ity, Lodumlu, An kara, Tur key Sci en tific pa per http://doi.org/10.2298/NTRP1802159TMea sur ing the nat u ral ra dio ac tiv ity lev els and ra don ex ha la tion rates (sur face and mass) in build ing ma te ri als is es sen tial to eval u ate the ex tent of ra di a tion ex po sure (ex ter nal and in ternal) for res i dents in dwell ings. Gamma-ray spec trom e try with a high pu rity ger ma nium de tector was used to mea sure the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in some build ing ma te ri als used in Tur key. More over, an ac tive ra don gas analyser with an ac cu mu la tion container was used to mea sure their ra don sur face and mass ex ha la tion rates. Re sults showed that the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K var ied from 5.2 ± 0.6 (satin plas ter) to 187.0 ± 2.4 (gran ite) Bqkg -1 , 2.6 ± 0.8 (gyp sum) to 172.2 ± 7.6 (gran ite) Bqkg -1 and 12.3 ± ±.17.0 (sand) to 1958.0 ± 83.4 (brick) Bqkg -1 , re spec tively. Ra don sur face and mass ex ha lation rates var ied from 2.9 (mar ble) to 2734.6 mBqm -2 h -1 (gran ite) and 0.033 (mar ble) to 53.866 mBqkg -1 h -1 (gran ite), re spec tively. The ac tiv ity con cen tra tion in dex, in door ab sorbed gamma dose rate and cor re spond ing an nual ef fec tive dose were es ti mated and com pared with the rec om mended limit val ues. The re sults in di cated that the build ing ma te ri als sam pled presented no sig nif i cant ra dio log i cal risk.Key words: nat u ral ra dio ac tiv ity, ra don ex ha la tion rate, AlphaGUARD, an nual ef fec tive dose, build ing ma te ri al S. Turhan, et al.: Nat u ral Ra di a tion Ex po sure and Ra don Ex ha la tion Rate of .

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Radioisotopes present in building materials of workplaces

Cited by 14 publications

References 17 publications

The influence of building material structure on radon emanation

The influence of building material structure on radon emanation

Determining radium-226 concentration from radon-222 emanation in building materials: a theoretical model

Natural radiation exposure and radon exhalation rate of building materials used in Turkey

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