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Monazite sand does not cause excess cancer incidence

PostPosted: 02 Jan 2009, 14:35
by Johan
Another indication that the linear no treshold model is flawed...

Monazite sand does not cause excess cancer incidence

Now it is official. In the January 2009 issue of the Health Physics Journal, researchers from the Regional Cancer Centre (RCC), Thiruvananthapuram, and their collaborators have shown that there is no excess cancer risk to people living in the area of high natural background radiation in Kerala from exposure to terrestrial gamma radiation.

In the coastal panchayats, the median outdoor gamma radiation levels are more than 4 mGy y{+-}{+1} and in certain locations, the levels are as high as 70mGy y {+-}{+1}.(Gy is a unit of radiation dose; mGy is one thousandth of a Gy; the annual gamma radiation level in normal locations is on an average one mGy).

They estimated the excess risk as -0.13 Gy{+-}{+1} (95 per cent confidence limit:-0.58, 0.46). The authors pointed out that the upper limit of 95 per cent confidence limit was lower than 0.97, which other researchers got for pooled analysis for nuclear workers from 15 countries (BMJ, 2005) and slightly lower than 0.47 Gy{+-}{+1} reported in the study of atomic bomb survivors in Hiroshima and Nagasaki (Radiation Research, 2007)