[ RadSafe ] Please Critique This Reply by Rosalie Bertell

[Marcel Schouwenburg]

Daer Mrs/Ms Bertelli,

The ICRP Respiratory Tract Model can be apllied to particles with a 
diameter < 0.1 micron. For this purpose the model describes a.o. 
fractional deposition in various compartments of the respiratory tract 
for particles down to a an Activity Median Thermodynamic Diameter, AMTD 
(to be used in stead of the AMAD because of the small particle size) of 
0.001 micron. So, the model can also be used for particles in a DU 
aerosol with a size between 0.001 micron and 0.1 micron.

Reference
ICRP-66 (1994), Human Respiratory Tract Model for Radiological 
Protection. ICRP-Publication 66, Annals of the ICRP 24(1-3), Elsevier 
Science LTD, Oxford, pp. 49-54.

With kind regards,

Marcel Schouwenburg
Head / Lecturer Training Centre Delft, Health Physicist, expert level 2
RadSafe Moderator & Listowner
National Centre for Radiation Protection (Dutch abbr. NCSV)

Delft University of Technology
Faculty of Applied Sciences / Reactor Institute Delft
Mekelweg 15
NL - 2629 JB  DELFT
The Netherlands
T: +31 (0)15 27 86575
F: +31 (0)15 27 81717
M: +31 (0)6 419 83 145
E: m.schouwenburg at tudelft.nl



Roger Helbig wrote:

>----- Original Message ----- 
>From: "Rosalie Bertell" <rosaliebertell at greynun.org>
>To: "'Roger Helbig'" <rhelbig at california.com>
>Sent: Tuesday, February 20, 2007 8:45 AM
>Subject: RE: Nichols Publish the Truth??????
>
>
>Dear Roger,
>
>My guess is that you are sending the estimates by the physicists who use the ICRP Respiratory Model methodology. This is only valid down to particles of aerodynamic diameter of
>0.1 micro. DU aerosol has been shown to coalesce into particles of
>aerodynamic diameter between 0.001 and 0.1 micron (nano particles).
>Therefore they miss some of the most serious effects.
>
>Dr. Rosalie Bertell.
>
>
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