Re: Radon Field Day

[epirad@mchsi.com]

Howard,



I don't think anyone wants to volunteer to get lung 

cancer.



Bill Field 

> Good News!

> The Field (Iowa) and Wang (China) studies do suggest more frequent lung cancer 

> at

> highest radon exposure than at lesser exposure, but that may be because there is

> LESS lung cancer at moderate exposure (37 Bq/cubic meter, 1 pCi/L up to 4x that)

> than with less exposure, according to the Cohen USA study!

> 

> All three studies have confounders which the authors struggled to remove, but 

> are

> likely not to be improved upon until we have placebo controlled radon exposure.

> Any volunteers?

> 

> Howard Long

> 

> "Richard F. Orthen" wrote:

> 

> > Another from IEM's news desk:

> >

> > May 17, 2002 - Ascribe News (05/16/02) - University of Iowa Study Finds

> > Health Risk From Residential Radon Exposure Higher Than Previously

> > Estimated - The health risk posed by residential radon exposure may have

> > been substantially underestimated in previous studies, according to

> > investigators in the University of Iowa College of Public Health. Long-term

> > exposure to radon gas in the home is associated with increased lung cancer

> > risk and presents a significant environmental health hazard. "Our findings

> > indicate that the exposure assessment models used in many previous studies

> > may have underestimated the risk posed by residential radon exposure by 50

> > percent or more," said lead author R. William Field, Ph.D., a research

> > scientist with the UI Department of Epidemiology. The results of the study

> > appear in the May 2002 issue of the Journal of Exposure Analysis and

> > Environmental Epidemiology. The UI researchers examined several exposure

> > assessment methods used by previous residential radon studies performed in

> > North America, Europe and China. They compared these models to a more

> > comprehensive exposure method that linked a person's movement to various

> > radon measurements within a home. All of the models were assessed using the

> > same study population. The exposure methods used by previous studies all

> > produced lower risk estimates than the comprehensive method. The highest

> > degree of error was noted for methods that based risk solely on basement

> > radon measurements. "While radon concentrations tend to be highest in

> > basements, people typically spend limited time there," Field said. "A more

> > accurate assessment of risk can be formulated by linking multiple radon

> > measurements taken within a home to where and how much time an occupant

> > spends in the home."

> >

> > Rick Orthen

> >

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