There is that assumption by the Safety Organizations that the cancer incidence is directly proportional to the exposure to the cancer causing agent. That is Linear No-Threshold (LNT)approach. Radiation is a mild carcinogenic agent.
In reality, everyone knows that the cancer can be caused by multiple reasons, both chemical, physical and biological. There are animal research findings which show existence of a threshold, particularly at low radiation doses.
In that case, do we have to worry about small exposures (say, within the acceptable limits recommended by the ICRP) to radiation received by the occupational workers?
Follow the link below for more on the LNT Controversy.
http://www.expresshealthcare.in/inimaging2011jul/inimaging2011july09.shtml
Thursday, September 15, 2011
Sunday, September 11, 2011
Volume of Arctic ice shrank to record low in 2010 - Global Warming Effect?
The total volume of Arctic sea ice shrank last fall to the smallest amount ever observed during the age of satellites, according to a new study that used ultra-sophisticated computer modeling program that incorporates ocean observations, submarine data, and space-age monitoring. The study was carried out by a team of scientists at the Polar Science Center of the University of Washington. Sea ice volume is an important climate indicator. The melt season for Arctic sea ice climaxes each September or October.
As of July 17, 2011, Arctic sea ice extent was 7.56 million square kilometers (2.92 million square miles), 2.24 million square kilometers (865,000 square miles) below the 1979 to 2000 average. Typical results show that one-year-old sea ice in the Beaufort Sea (north of Canada/Alaska) is about 20-30 cm thinner this year than in the two previous years. In 2009 the ice thickness was 1.7 m on average, in 2010 it was 1.6 m and in 2011 it is around 1.4 m. Queries are raised as to how long this thin one-year-old sea ice will survive?
The research shows worrisome picture of rapid climate change at the top of the world that could see the Arctic Ocean ice-free within decades and a faster rise in sea levels.
As of July 17, 2011, Arctic sea ice extent was 7.56 million square kilometers (2.92 million square miles), 2.24 million square kilometers (865,000 square miles) below the 1979 to 2000 average. Typical results show that one-year-old sea ice in the Beaufort Sea (north of Canada/Alaska) is about 20-30 cm thinner this year than in the two previous years. In 2009 the ice thickness was 1.7 m on average, in 2010 it was 1.6 m and in 2011 it is around 1.4 m. Queries are raised as to how long this thin one-year-old sea ice will survive?
The research shows worrisome picture of rapid climate change at the top of the world that could see the Arctic Ocean ice-free within decades and a faster rise in sea levels.
Subscribe to:
Posts (Atom)
