Measurement of Indoor Radon in Some Dwellings in Aizawl (India)

Abstract

The indoor radon level in terms of potential alpha energy exposure (PAEE) has been measured in several dwellings of Aizawl town (23.36 N, 93.00 E) situated in north-eastern India. Films of LR-115 (type II) solid state nuclear track detector (SSNTD) were used in bare mode in the present measurements. The PAEE values in most of the dwellings are lower than the action level pre scribed by the International Commission on Radiological Protection (ICRP- 65). The geometrical mean value of the PAEE from the present set of measure ments has been found to be 7.5 ± 2.5 mWL. It is further observed that ventila tion and type of building construction materials have a considerable influence on the level of indoor radon.

Keywords

Indoor radon Solid-state nuclear track detector Passive detector LR-115 Potential alpha energy exposure

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References

Durrani SA : Radon as a health hazard at home: What are the facts?: Nucl Tracks Radiat Meas 1993;22:303-317.

Sevc J. , Kunz E. , Tomasek L. , Placek V. , Horacek J. : Cancer in man after exposure to radon daughters. Health Phys 1988;54:27-46.

Chovil A. : The epidemiology of primary lung cancer in uranium miners in Ontario. J Occup Med 1981;23;417-421.

Archer VE , Wagoner JK , Lundin Jr FE : Lung cancer among uranium miners in United States. Health Phys 1973;23:351-371.

Steinhausler F. : Indoor radon: Health effects and future trends; in Tommasino L , Furlan G , Khan HA , Monnin M (eds): Radon Monitoring. Radioprotection, Environmental Radioactivity and Earth Sciences. Singapore, World Scientific, 1990, pp 32-50.

Pershagen G. , Liang ZH , Hrubec Z. , Svenson C. , Boice Jr JD : Residential radon exposure and lung cancer in Swedish women. Health Phys 1993;63:179-186.

Henshaw DL , Eatough JP , Richardson RB : Radon as a causative factor in induction of myeloid leukaemia and other cancers . Lancet 1990;335:1008-1012.

Paschoa AS , Pinho RR , Binns Dac : Monitoring radon and environmental gamma radiation indoors and outdoors at PUC/RJ, Brazil; in-Tommasino L, Furlan G, Khan HA, Monnin M (eds): Radon Monitoring. Radioprotection, Environmental Radioactivity and Earth Sciences. Singapore , World Scientific, 1990, pp 381-396 (and references therein).

Ilic R. : Indoor and outdoor radon survey in Slovenia by etched track detection. Second Workshop on Radon Monitoring and Radioprotection, Environmental and/or Earth Sciences. Trieste, Nov 25-Dec 6, 1991.

10.

Zhang H. , Chen L. : Radon-222 indoor concentration in the CIAE region of Beijing: Nucl Tracks Radiat Meas 1993;22:511-514.

11.

Subba Ramu MC , Ramachandran TV , Muraleedharan TS , Shaikh AN : Indoor levels of radon daughters in some high background areas in India. Radiat Protect Dosimetry 1990;30:41-44.

12.

Nakhara H. , Kudo H. , Akiba F. , Murakami Y. : Some basic studies on the absolute determination of radon concentration in the air by a cellulose nitrate track detector. Nucl Instrum Methods 1980;171:171-179.

13.

Ramachandran TV , Muraleedharan TS , Subba Ramu MC : Calibration of nuclear track detectors for the measurement of indoor radon and thoron levels. Indian J Phys 1990; 64A:365-374.

14.

Lalramengzami R. : Indoor radon monitoring in Mizoram state , MSc thesis, Chemistry Department, North Eastern Hill University, Shillong 1994.

15.

Icrp : Protection against 222Rn at home and at work. Ann ICRP (ICRP Publ No 65) 1993;23.

16.

Abu-Jarad F. , Sithaparanadarajah R. , Thompson JM , Fremlin JH : Comparison of various techniques for measuring natural ventilation in rooms: Phys Med Biol 1982;27:1393-1400.

17.

Abu-Jarad F. : Variation in long term radon and daughters concentration with position inside a room. Radiat Protect Dosimetry 1982 ;3:227-231.