STUDIES ON THE ACTIVITY RATIOS OF PO-210 TO PB-210 AND THEIR DRY-DEPOSITION VELOCITIES AT BOMBAY IN INDIA

被引：35

作者：

ANAND, SJS

RANGARAJAN, C

机构：

[1] Pollution Monitoring Section, Bhabha Atomic Research Centre, Bombay, 400085, Trombay

来源：

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 1990年 / 11卷 / 03期

关键词：

D O I：

10.1016/0265-931X(90)90017-P

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Atmospheric concentrations and dry fallout of 210Pb and 210Po have been measured at Bombay in India during 1985-1987 using air samplers and surrogate collectors respectively. The objective of these measurements was to compare the 210Po/210Pb activity ratios in surface air and dry fallout and to estimate the dry-deposition velocity, Vg, of the atmospheric particulates carrying these two radionuclides. The location of Bombay is eminently suitable for such studies in view of its continuous dry period of about eight months. An analysis of the collected data shows that the average 210Po/210Pb activity ratio in dry fallout (0·47 ± 0·39) is considerably higher than that in surface air (0·12 ± 0·08). This has been attributed to the higher values for 210Po (0.76 ± 0.48 cms-1) relative to 210Pb (0.14 ± 0.07 cm s-1). The higher Vg values for 210Po could be due to complementary sources of 210Po, such as resuspension of soil particles, etc., in addition to atmospheric 222Rn. A source apportionment has also been carried out for atmospheric 210Po using the 210Po/210Pb activity ratios, the Vg values for a range of radionuclides and their estimated atmospheric residence times. This calculation indicates that only about 17 ± 13% of 210Po may derive from atmospheric 222Rn, while 25 ± 10% is from soil and the rest from other sources. The Vg values from surrogate collectors reported here are useful as indices of deposition to other surfaces and give an idea of the relative magnitudes of Vg values for various species. © 1990.

引用

页码：235 / 250

页数：16

共 32 条

[21]

Moore, Poet, Martell, Size distribution and origin of lead-210, bismuth-210 and polonium-210 in airborne particles in the troposphere, Natural Radiation Environment III, pp. 415-429, (1980)

[22]

Nevissi, Schell, Use of lead-210 and polonium-210 as tracers of atmospheric process, Natural Radiation Environment III, pp. 405-414, (1980)

[23]

Nozaki, DeMaster, Lewis, Turekian, Atmospheric <sup>210</sup>Pb fluxes determined from soil profiles, Journal of Geophysical Research, 83, pp. 4047-4051, (1978)

[24]

Parfnev, Polonium-210 in the environment and in the human organism, Atomic Energy Review, 12, pp. 75-143, (1974)

[25]

Peirson, Cambray, Spicer, Lead-210 and polonium-210 in the atmosphere, Tellus, 18, pp. 427-433, (1966)

[26]

Poet, Moore, Martell, Lead-210 bismuth-210 and polonium-210 in the atmosphere Accurate ratio measurement and application, Journal of Geophysical Research, 77, pp. 6515-6527, (1972)

[27]

Pruppacher, Semonin, Slinn, Precipitation Scavenging, Dry Deposition and Resuspension, (1983)

[28]

Rangarajan, Eapen, Gopalakrishnan, Measured values of the dry deposition velocities of atmospheric aerosol carrying natural and fallout radionuclides using artificial collectors, Water, Air and Soil Pollution, 27, pp. 305-313, (1986)

[29]

Rangarajan, Madhavan, Gopalakrishnan, Spatial and temporal distribution of lead-210 in surface layers of the atmosphere, J. Environ. Radioactivity, 3, pp. 23-33, (1986)

[30]

Sehmel, Particle and gas deposition: A review, Atmos. Environ., 14, pp. 983-1011, (1980)

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