Abstract
Ever since studies on uranium miners established the presence of a positive risk coefficient for the occurrence of lung cancer in miners exposed to elevated levels of 222Rn and its progeny, there was a great upsurge of interest in the measurement of 222Rn in the environment. Subsequently, considerable data is being generated on the levels of 222Rn in the environment across the worlds and is being periodically reported by UNSCEAR reports. In contrast to this, data pertaining to 220Rn in indoors and workplace environment is scaree due to the genral perception that its levels are negligible due to its shorter half life, and subsequently its contribution to the total inhalation dose is ignored, in the presence of other significant sources of natural radiation. This may not be true.
Globally many locations have higher levels of natural background radiation due to elevated levels of primordial radio nuclides in the soil and their decay products like radon (222Rn), and thoron (220Rn) in the environment. Of late, technologically enhanced naturally occurring radioactive material has also contributed to the burden of background radiation. It is estimated that inhalation of 222Rn, 220Rn and their short lived progenies contribute more than 54% of the total natural background radiation dose received by the general population. 220Rn problem exists in industries which use thorium nitrate. Including India, lamps using thoriated gas mantles are still being used for indoor and outdoor lighting and by hawkers in rural as well as urban areas. Considering the fact that large amount of thorium nitrate is being handled by these industries, contribution to the inhalation dose of workers from 220Rn gas emanated and build up of the progeny in ambient air may also be quite significant. In this paper current status of 220Rn levels in the indoor environment and workplaces as well as in other industries where large amount of 232Th is being handled is being summarized. Methods of measurement and reported levels are also summarized.
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References
UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation, Report to the General Assembly (New York: United Nations) (2000)
F Steinhausler, M Hofman and H Lettner Radiat. Prot. Dosim. 56 127 (1994)
J Porstendorfer J. Aerosol Science 25 219 (1994)
S D Schery Thoron and its progeny in the atmospheric environment, Gases Pollutants: Characterization and cycling (Inc, New York: John Wiley & Sons) Ch.10 (1992)
H Israel, M Horbert and C de La Riva Measurement of the thoron concentration of the lower atmosphere in relation to the exchanges 9thAUSTA JSCH”) IN THIS REGION, Final report, Contract DAJA 37 - 67 - C - 0593 (New York: U S Army, APO) (1968)
H Israel Atmospheric Electricity, Nat. Tech. Inf. Services (Springfield, VA) Vol. 2 (1972)
L A Burchfield, J D Akridge and P K Kuroda J. Geophys. Res. 88 8579 (1983)
D Langmuir and J S Herman Geochim. Cosmochim. Acta. 44 1753 (1980)
K H Wedepoil (ed.) Handbook of Geochem Vol. 11–5 Chapter 90 (Berlin: Springer-Verlag) (1978)
UNSACEAR, United Nations scientific Commitlee on the Effect of Atomic Radiation, Report No. A/AC.82/R-644 (New York: United Nations) (2006)
IAEA, International Atomic Energy Agency Report; Application of concept of exclusion, exemption and clearance., Safety Standards Series No. RS - G-1.7, IAEA, Vienna (2005)
L Stein Chemical properties of radon., In: Hople et al, (eds.) Radon and its decay products, ACS Sym. Se. 331 (Americal Chemical Society, Washington, DC) 240 (1987)
S D Schery and M A Wasiolek Modeling radon flux from the earth’s surface, in Proc. of 7th Tohwa Univ. Int. Symp., October 23–25, 1997 (Fukuok, Japan) (1997)
T Chrlensen, H Ehdwall and E Stranden (eds) Natural radiation, nuclear wastes and chemical Pollutants: Nordic Liason Committee for Atomic Energy, Stockholm, Sweden (1990)
NEPA, (1990) National Environmental Protection Agency, Nation-wide survey of environmental radioactivity levels in China (1983–1990), Rep. No. 90, S315–206, The People’s Rep. of China
F Steinhausler Environmental Rn 220 A Review, Envir. International, 22,Suppl. 1, pp. S111–S1123 (1996)
J Porseenclorfer Tutorial lessons: Properties and behavior of radon and thoron and their decay products in the air: In. IV Int. Symp. on the Nat. Radiat. Envir., Austria, Sept. 1991 (1991)
V K Shukla, S Sadasivan, V K Sundaram and K S V Nambi Radiat. Prot. Dosim. 59 127 (1995)
W Zhuo, T Lida and S Morizumi Radiat. Prot. Dosim. 93 357 (2001)
UNSCEAR, United nations Scientific Committee on the Effects of Atomic Radiation, Report to the General Assembly (New York: United Nations) (1993)
NEA, Exposure to radiation from the natural radioactivity in some building materials., Report by an NEA group of experts., Nuclear Energy Agency., Organisation for Economic Co-operation and Development, France (1979)
European Commission, Radiological Protection Principles Concerning the Natural Radioactivity of Building materials., Report No. Radiation Protection — 112 (1999)
IAEA, International Atomic Energy Agency, International basic Standards for Protection Against Ionizing Radiation for the Safety of Radiation Sources., Safety Series No. 115, IAEA, (Vienna) 1994
G W Israel Thoron measurement in the atmosphere and their applications in meteorology, Tellus, XVII 3, 388 (1965)
A Druilhet, D Guedalia, J Fontanm and J L Laurent J. Geophys. 6508 (1992)
S D Schery Hlth. Phys. 49 1061 (1985)
A Reineking, G Butterweck, K Kesten and J Porstendorfer Radiat. Prot. Dosim. 45 353 (1992)
S Tokanami, H Yonehara and W Zhuo Understanding of high radon concentrations observed in a well ventilated Japanese wooden house in: Indoor air., 2002., 665–669, Proceeding of the 9th Int. Conf. on Indoor Air Quality and Climate., California., Int. Soc. of Indoor and Climate (Santa Cruze, CA) (2002)
S Tokanami, T Takahashi and T Lida Hlth. Phys. 73 494 (1997)
W S Zhuo, H Tokanami and M Yonehars Rev. Sci. Instrum. 73 2877 (2002)
M N Monnin Physical basis for radon emission ans measurement techniques. in: Proceeding of the International Workshop on radon Monitoring in Radioprotection, Environmental radioactivity and earth Sciences. (eds.) L Tommasini, G Furlan, H A Khan and M Monnin (Singapore: World Scientific) 199 (1989)
G Jha Development of a passive radon dosimeter for application in radiation protection and uranium exploration, PhD Thesis, University of Mumbai (1986)
D P Bhanthi and A M Bhagwat Theoretical behaviour of calibration factors of bare mode SSNTD dosimeters for radon and thoron daughter products. In Proc. 5th Nat. Symp. On Envir., Feb 28–March, 1 (Calcutta) (1996)
T V Ramachandran, B Y Lalit and U C Mishra Nuclear Tracks Radi. Meas. 13 81 (1987)
R Ilic and T ind Sutleg Radon monitoring devices based on etched track detectors, In radon measurements by etched track detectors: Applications in Radiation Protection, Earth Sci. and the Envir., (eds.) S A Durrani and R Ilic (Singapore: World Scientific) 103 (2000)
G Jonsson Nucl. Instrum. Methods 190 407 (1981)
T S Muraleedharan and M C Subba Ramu Performance of LR — 115 films in a large scale, long — term radon monitoring programme, in Proc. 2nd Nat. Sym. On Envir. (Jodhpur) 41 (1993)
K P Eappen, T V Ramachandran, A N Shaikh and Y S Mayya J. Radi. Prot. Envir. 24 410 (2001)
U C Mishra Natural and fallout gamma nuclides in Indian soils, Natural Radiation Environment — II, Vol. 1, USERDA, CONF -720805-P2, 333 (1972)
V K Shukla, S Sadasivan, V K Sundaram and K S V Nambi Radiat. Prot. Dosim. 59 127 (1995)
A V Sankaran, B Jayaswal, K S V Nambi and C M Sunia U, Th and K distributions inferred from regional geology and the terrestrial radiation profiles in India, BARC, Tech. Report (1986)
K P Eappen, R N Nair, Y S Mayya, T V Ramachandran, S Sadasivan, M Krishnan Nair and P Gangadharan A study of inhalation dose estimated at high background radiation areas in Kerala, in Proc. 9th Nat. Symp. on Envir. (Bangalore) 173 (2000)
T V Ramachandran, M C Subba Ramu and K S V Nambi Bull. Radiat. Prot. 18 109 (1995)
J Biju Mine models and the thoron problem in underground uranium mines. Rad. Hazards in Mining., Soc. of Mining Engg. (New York) (1981)
E Stranden Thoron daughter to radon daughter ratio in mines. In. H. Stocker, (ed.) Occupational Radiation Safety in Mining. Canadian Nuclear Association (Toranto) 604 (1985)
D W Dixon, A C James, J C Strong and A D Wrixon A review of all sources of exposure to natural radiation in UK mines. In H Stocker, (ed.) Occup. Radiation Safety in Mining. Canadian Nuclear Ass. (Toronto) 241 (1985)
A Rannou Contribution a letude du risque le a la presence du radon222 et du radon 220 das Fatmosphere des habitation, Rapp. CEA-R-5378 Commissariat a lenergie Atomic, Saclay (France) (1987)
B L Shuai Thorium buildings and the nature of gas measurement. J. Chongqing University. 22No. 4 (1999)
ICRP., International Commission on radiological Protection. Lung Cancer Risk from Indoor Exposures to radon daughters. Annals of the ICRP 17(1)., ICRP Publications 50, (Oxford: Pregamon press) (1987)
AERB., Atomic Energy Regulatory Board. Standard specification — SS4. Radiological Safety in Design and Manufacturing of Consumer Products containing radioactive Substances (Atomic Energy Regulatory Board, India) (1991)
G Sadagopan, K S V Nambi, G Venkataraman, V K Shukla and K Kayasth Radiat. Prot. Dosm. 71 53 (1997)
M J Duggan Health Phys. 24 301 (1973)
J Biju Radiat. Prot. Dosim. 35 47 (1991)
A S Paschoa and J Pohl-Ruling Environ. Int. 19 519 (1993)
BEIR, Biological Effect of Ionizing Radiation, BEIR-IV report, Health Risks of radon and other internally deposited alpha emitters (Washington, D.C.: Nat. Academy Press) (1988)
P Chittapore, N Harley and R Medora Health Phys. 80 S 171 (2001)
S Tokonani, M Yang and T Sanada Health Phys. 80 612 (2001)
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Ramachandran, T.V., Sahoo, B.K. Thoron (220Rn) in the indoor environment and work places. Indian J Phys 83, 1079–1098 (2009). https://doi.org/10.1007/s12648-009-0086-z
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DOI: https://doi.org/10.1007/s12648-009-0086-z