S. Namitha - Academia.edu (original) (raw)

Papers by S. Namitha

Nuclear and Particle Physics Proceedings

Aerosol particles, their size, and number distribution play a key role as they affect the climate... more Aerosol particles, their size, and number distribution play a key role as they affect the climate, quality of the air, and human health. In the present work, the distribution of aerosol particles was studied using the NanoScan SMPS (TSI 3910) during Deepawali, a festival of lights, at three locations in Madikeri town, Karnataka, India, and the diurnal variation of radon and its progeny was studied at one location. People celebrate this festival by bursting crackers and lighting lamps, which increases aerosol particles leading to pollution of air. The observation showed an increase of nucleation particles of size 11.5 nm and 15.4 nm during this period. The average number of nucleation, Aitken, and accumulation particles at L1 was 48.86, 30.98, and 19.31 cm − 3 ; at L2 was 37.44, 26.75 and 16.21 cm − 3 ; and at L3 was 29.88, 19.95, and 15.192 cm − 3. During the study period, the average concentration of 222 Rn at L1 was found to be 19.54 Bq m − 3. The diurnal studies at L1 showed 222 Rn and its progeny to be higher during early morning and late evening hours, whereas lower during daytime. The radon progeny were observed to be lower during the festive period compared to other days, which may be attributed to the increased ion-aerosol recombination processes. The average concentrations of 218 Po, 214 Pb and 214 Po at L1 before and during the festival were 3.06, 1.61, and 1.52 Bq m − 3 ; and 2.09, 0.55, and 0.53 Bq m − 3 , respectively.

Research Square (Research Square), Aug 17, 2023

Groundwater dissolves radioactive minerals like uranium, radium, radon and polonium during its ow... more Groundwater dissolves radioactive minerals like uranium, radium, radon and polonium during its ow. 226 Ra, 222 Rn, and 210 Po are the decay products of the 238 U series which causes ingestion dose to human being. The activity of these radionuclides was studied in groundwater samples collected from Chamarajanagar district, Karnataka, India. 226 Ra, 222 Rn and 210 Po concentration in bore well water samples were varied from 2.18 to 96.42mBql − 1 , 0.94 to 26.95Bql − 1 , 0.72 to 6.33mBql − 1 respectively. The average ingestion dose due to 226 Ra, 222 Rn and 210 Po were 6.41, 11.60 and 2.51µSvy − 1 respectively.

Trace amounts of uranium along with its decay products are found in varying levels in natural soi... more Trace amounts of uranium along with its decay products are found in varying levels in natural soil, rocks, water and air. They are a matter of significant concern due to their carcinogenic nature. In the present work, the distribution of U and 210 Po in groundwater of Kodagu District, Karnataka, India, was studied. The concentration of total U in groundwater samples was estimated using LASER and LED fluorimeter, and the activity of 210 Po in groundwater was studied using electrochemical deposition followed by alpha counting method. The concentration of U and 210 Po varied from 0.4 to 8.8 μgl −1 and 0.47 to 4.35 mBql −1 , respectively. The ingestion dose due to U and 210 Po in groundwater varied from 0.33 to 7.17 and 0.41 to 3.81 μSv y −1 , respectively. The estimated U activity was found to be well below the standard safe limits of 30 μgl −1 in drinking water, as recommended by WHO and USEPA. The 210 Po activity was low compared with the recommended 100 mBql −1 standard of WHO.

Journal of Radioanalytical and Nuclear Chemistry, 2022

The concentrations of 226Ra and 222Rn were measured in ground water samples of Davanagere distric... more The concentrations of 226Ra and 222Rn were measured in ground water samples of Davanagere district, Karnataka state, India using emanometry technique. Activity of 226Ra and 222Rn in groundwater varied from 15.6 ± 3 to 68.9 ± 5 mBql−1 and 37 ± 4 to 245 ± 8 Bql−1 respectively. More than 53% of the water samples showed higher radon concentration compare to standard safe limit of 100 Bql−1 prescribed by WHO. Effective dose to the public due to 222Rn in water was found to vary from 0.15 to 1.00 mSvy−1 with an average of 0.49 mSvy−1.

Nuclear and Particle Physics Proceedings, 2023

Aerosol particles, their size, and number distribution play a key role as they affect the climate... more Aerosol particles, their size, and number distribution play a key role as they affect the climate, quality of the air, and human health. In the present work, the distribution of aerosol particles was studied using the NanoScan SMPS (TSI 3910) during Deepawali, a festival of lights, at three locations in Madikeri town, Karnataka, India, and the diurnal variation of radon and its progeny was studied at one location. People celebrate this festival by bursting crackers and lighting lamps, which increases aerosol particles leading to pollution of air. The observation showed an increase of nucleation particles of size 11.5 nm and 15.4 nm during this period. The average number of nucleation, Aitken, and accumulation particles at L1 was 48.86, 30.98, and 19.31 cm − 3 ; at L2 was 37.44, 26.75 and 16.21 cm − 3 ; and at L3 was 29.88, 19.95, and 15.192 cm − 3. During the study period, the average concentration of 222 Rn at L1 was found to be 19.54 Bq m − 3. The diurnal studies at L1 showed 222 Rn and its progeny to be higher during early morning and late evening hours, whereas lower during daytime. The radon progeny were observed to be lower during the festive period compared to other days, which may be attributed to the increased ion-aerosol recombination processes. The average concentrations of 218 Po, 214 Pb and 214 Po at L1 before and during the festival were 3.06, 1.61, and 1.52 Bq m − 3 ; and 2.09, 0.55, and 0.53 Bq m − 3 , respectively.

Nuclear and Particle Physics Proceedings

Aerosol particles, their size, and number distribution play a key role as they affect the climate... more Aerosol particles, their size, and number distribution play a key role as they affect the climate, quality of the air, and human health. In the present work, the distribution of aerosol particles was studied using the NanoScan SMPS (TSI 3910) during Deepawali, a festival of lights, at three locations in Madikeri town, Karnataka, India, and the diurnal variation of radon and its progeny was studied at one location. People celebrate this festival by bursting crackers and lighting lamps, which increases aerosol particles leading to pollution of air. The observation showed an increase of nucleation particles of size 11.5 nm and 15.4 nm during this period. The average number of nucleation, Aitken, and accumulation particles at L1 was 48.86, 30.98, and 19.31 cm − 3 ; at L2 was 37.44, 26.75 and 16.21 cm − 3 ; and at L3 was 29.88, 19.95, and 15.192 cm − 3. During the study period, the average concentration of 222 Rn at L1 was found to be 19.54 Bq m − 3. The diurnal studies at L1 showed 222 Rn and its progeny to be higher during early morning and late evening hours, whereas lower during daytime. The radon progeny were observed to be lower during the festive period compared to other days, which may be attributed to the increased ion-aerosol recombination processes. The average concentrations of 218 Po, 214 Pb and 214 Po at L1 before and during the festival were 3.06, 1.61, and 1.52 Bq m − 3 ; and 2.09, 0.55, and 0.53 Bq m − 3 , respectively.

Research Square (Research Square), Aug 17, 2023

Groundwater dissolves radioactive minerals like uranium, radium, radon and polonium during its ow... more Groundwater dissolves radioactive minerals like uranium, radium, radon and polonium during its ow. 226 Ra, 222 Rn, and 210 Po are the decay products of the 238 U series which causes ingestion dose to human being. The activity of these radionuclides was studied in groundwater samples collected from Chamarajanagar district, Karnataka, India. 226 Ra, 222 Rn and 210 Po concentration in bore well water samples were varied from 2.18 to 96.42mBql − 1 , 0.94 to 26.95Bql − 1 , 0.72 to 6.33mBql − 1 respectively. The average ingestion dose due to 226 Ra, 222 Rn and 210 Po were 6.41, 11.60 and 2.51µSvy − 1 respectively.

Trace amounts of uranium along with its decay products are found in varying levels in natural soi... more Trace amounts of uranium along with its decay products are found in varying levels in natural soil, rocks, water and air. They are a matter of significant concern due to their carcinogenic nature. In the present work, the distribution of U and 210 Po in groundwater of Kodagu District, Karnataka, India, was studied. The concentration of total U in groundwater samples was estimated using LASER and LED fluorimeter, and the activity of 210 Po in groundwater was studied using electrochemical deposition followed by alpha counting method. The concentration of U and 210 Po varied from 0.4 to 8.8 μgl −1 and 0.47 to 4.35 mBql −1 , respectively. The ingestion dose due to U and 210 Po in groundwater varied from 0.33 to 7.17 and 0.41 to 3.81 μSv y −1 , respectively. The estimated U activity was found to be well below the standard safe limits of 30 μgl −1 in drinking water, as recommended by WHO and USEPA. The 210 Po activity was low compared with the recommended 100 mBql −1 standard of WHO.

Journal of Radioanalytical and Nuclear Chemistry, 2022

The concentrations of 226Ra and 222Rn were measured in ground water samples of Davanagere distric... more The concentrations of 226Ra and 222Rn were measured in ground water samples of Davanagere district, Karnataka state, India using emanometry technique. Activity of 226Ra and 222Rn in groundwater varied from 15.6 ± 3 to 68.9 ± 5 mBql−1 and 37 ± 4 to 245 ± 8 Bql−1 respectively. More than 53% of the water samples showed higher radon concentration compare to standard safe limit of 100 Bql−1 prescribed by WHO. Effective dose to the public due to 222Rn in water was found to vary from 0.15 to 1.00 mSvy−1 with an average of 0.49 mSvy−1.

Nuclear and Particle Physics Proceedings, 2023

Aerosol particles, their size, and number distribution play a key role as they affect the climate... more Aerosol particles, their size, and number distribution play a key role as they affect the climate, quality of the air, and human health. In the present work, the distribution of aerosol particles was studied using the NanoScan SMPS (TSI 3910) during Deepawali, a festival of lights, at three locations in Madikeri town, Karnataka, India, and the diurnal variation of radon and its progeny was studied at one location. People celebrate this festival by bursting crackers and lighting lamps, which increases aerosol particles leading to pollution of air. The observation showed an increase of nucleation particles of size 11.5 nm and 15.4 nm during this period. The average number of nucleation, Aitken, and accumulation particles at L1 was 48.86, 30.98, and 19.31 cm − 3 ; at L2 was 37.44, 26.75 and 16.21 cm − 3 ; and at L3 was 29.88, 19.95, and 15.192 cm − 3. During the study period, the average concentration of 222 Rn at L1 was found to be 19.54 Bq m − 3. The diurnal studies at L1 showed 222 Rn and its progeny to be higher during early morning and late evening hours, whereas lower during daytime. The radon progeny were observed to be lower during the festive period compared to other days, which may be attributed to the increased ion-aerosol recombination processes. The average concentrations of 218 Po, 214 Pb and 214 Po at L1 before and during the festival were 3.06, 1.61, and 1.52 Bq m − 3 ; and 2.09, 0.55, and 0.53 Bq m − 3 , respectively.