[ RadSafe ] Thorium mineral ALI

[Tsurikov, Nick]

Dear Kai,

The dose conversion factors used in the West Australian mineral sands
industry, depending on Activity Median Aerodynamic Diameter (AMAD):
1 micron AMAD = 0.0130 mSv/Bq (used for members of the public);
5 micron AMAD = 0.0097 mSv/Bq (default value);
10 micro AMAD = 0.0057 mSv/Bq (if a pre-set number of valid personal
impactor samples in the monitoring period indicates that this is the
case).
>From here you can easily estimate what the ALI would be.

Please contact me direct if you need any additional information.

Kind regards
Nick Tsurikov
Eneabba, Western Australia



-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Kai Kaletsch
Sent: Wednesday, 8 June 2005 8:43 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Thorium mineral ALI

Friends,

I am looking for a default inhalation ALI value to use for natural
Thorium 
in equilibrium with its progeny as it occurs in ores. One could
calculate a 
value from the values published in ICRP 61, but I was hoping someone had

looked at more realistic size distributions that would occur in earth
moving 
type applications.

Thanks in advance,
Kai


Kai Kaletsch
Environmental Instruments Canada Inc.

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