SURVEY ON THE CONCENTRATION OF RADON (222Rn) AND RADIUM (226Ra) IN DOMESTIC WATER IN BAC TU LIEM DISTRICT, HANOI CITY

Nguyễn Văn Dũng, Vũ Thị Lan Anh

Abstract


Radon (222Rn) and Radium (226Ra) are natural radiation isotopes that greatly affect human health. Based on that study, we surveyed the 222Rn and 226Ra concentration in domestic water, including: 12 samples of supply water, 18 samples of treated well water and 30 samples of well water in households in the area of Bac Tu Liem District, Hanoi City. Radon gas concentration is determined by a specialized measuring device, RAD-7 and Radium gas concentration is determined by Radium adsorption method on MnO2 plate. The results of the study showed that the radium concentration in the survey area had 07 samples of treated well water with concentration from ~ 1.03 to ~ 1.27 times higher than the allowed limit. The radon concentration in supply water is from (0.05 ± 0.02) Bq.l-1 to (1.05 ± 0.04) Bq.l-1; Well treated water is worth (0.8 ± 0.03) Bq.l-1 to (3.56 ± 0.08) Bq.l-1 and bore well water has values ranging from (1.67 ± 0.08) Bq.l-1 to (8.87 ± 0.23) Bq.l-1, these values are within the limits allowed by the Environmental Protection Agency (EPA) is 0.185 Bq.l-1.  Samples of well water concentration of 222Rn, 226Ra are higher than those of tap water and treated water. In addition, concentrations of 222Rn and 226Ra in the surveyed sources have no linear relationship.


Keywords


radon; radium; RAD-7; radon measurement; radium measurement method; dose

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References


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