The sedimentation process can be correlated with time by assessing decays of radionuclides like Pb and its environmental cycle have been commonly used as environmental tracer in many environmental studies.
For assessment of chronological history of pollution in the Mumbai region, sediment samples were collected from Thane creek and sedimentation rates were estimated by measurement of Sharma, D. (ed.) (Health Physics Division, Bhabha Atomic Research Centre, Mumbai (India)); Puranik, V. (ed.) (Environmental Assessment Division, Bhabha Atomic Research Centre, Mumbai (India)); Pushparaja (ed.) (Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai (India)) (and others); Indian Association of Radiation Protection, Bhabha Atomic Research Centre, Mumbai (India); 227 p; 2012; p. IARP conference on radiological protection and safety in nuclear reactors and radiation installations; Mangalore (India); 15-; 1 fig.
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Spatial distribution of OCPs was assessed in surface grab sediments and depth profiles of HCH and DDT were obtained in different cores.
Radiological dating was performed by estimating the Po activity by alpha spectrometry, whereas the OCPs determination was carried out using gas chromatography.
The earliest evidence of Thane appears in the works of the Greek geographer, Ptolemy, who, in his writings ( 135 - 150 AD) refers to a place called Chersonesus, which, according to researches, is the area around Thane creek.
The city crops up again in the Middle Ages and slabs and copper plates dating back to the period have been discovered in Thane.