I looked back and I did say "dose" - I should have said "exposure". It was
a concentration times time, which is not the same as dose because it
depends on (an assumed) human respiration rate and inspired volume.

On Mon, Apr 24, 2017 at 12:59 PM, David C Brown <dcb.home@gmail.com> wrote:

> You quoted them as doses not concentrations.  Quite different
>
> __________________________________________
> David C Brown
> 43 Bings Road
> Whaley Bridge
> High Peak                           Phone: 01663 733236
> Derbyshire                eMail: dcb.home@gmail.com
> SK23 7ND          web: www.bings-knowle.co.uk/dcb
> <http://www.jb.man.ac.uk/~dcb>
>
>
>
> *Sent from my etch-a-sketch*
>
> On 24 April 2017 at 14:35, Sean Breheny <shb7@cornell.edu> wrote:
>
> > David,
> >
> > No - both of those figures are concentrations. It's not 50ug - it's
> > 50ug/m^3.
> >
> > Sean
> >
> >
> > On Mon, Apr 24, 2017 at 9:19 AM, David C Brown <dcb.home@gmail.com>
> wrote:
> >
> > > You would need 16 litres at 3mg m^-3 to be equivalent to the 50ug
> > > permissible dose.  That is a helluva lot of solder smoke.
> > >
> > > __________________________________________
> > > David C Brown
> > > 43 Bings Road
> > > Whaley Bridge
> > > High Peak                           Phone: 01663 733236
> > > Derbyshire                eMail: dcb.home@gmail.com
> > > SK23 7ND          web: www.bings-knowle.co.uk/dcb
> > > <http://www.jb.man.ac.uk/~dcb>
> > >
> > >
> > >
> > > *Sent from my etch-a-sketch*
> > >
> > >
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