Re: Fw: Glass-Based Radon Measurements

[Kai Kaletsch <info@eic.nu>]

John et al,



That depends how one defines "good". A little bit of systematic error is

worse than a lot of random error for these studies. Random errors tend to

"come out in the wash".



Radon concentrations in a house are partially a function of the properties

of the house and partially a function of the lifestyle of the occupants

(opening windows and doors, using central vac ...). Since a lung cancer

diagnosis will affect lifestyle (probably in the same direction for most

people), using current air measurements to extrapolate to previous exposures

can introduce biases.



My interest in the glass based measurements is that they represent a

measurement of the cases' pre-diagnosis radon exposure. However, so far, it

is not making any sense. I'll keep trying. Thank you to those who have taken

the time to help me with the problem both on and off list.



Regards,

Kai



From: "John Johnson" <idias@interchange.ubc.ca>



> Tony et al

>

> I agree. Glass based measurement or not as good as continuous air

> monitoring, but the are better than a single "real time" air sample.

>

> John

> ________________

> John R Johnson, Ph D

> 4535 West 9th Ave.

> Vancouver, B. C.

> V6R 2E2

> (604) 222-9840

> idias@interchange.ubc.ca

>

>

> Subject: Re: Fw: Glass-Based Radon Measurements

>

>

> > The point of the paper, however, was not lung cancer risks, but that

> > glass based measurements provide a better basis for long term dose

> > assessment than air samples, a claim that has been made in other papers.

> >  I think the jury is still out on that one, and we can honestly say that

> > it needs further investigation.

>

>



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