```Dear Joshi and Tim

may I ask you what this is useful for???

1TU is defined as a ratio of tritium to hydrogen atoms of 1e-18,
so by definition 1Mol of Water with 1TU contains 3e-18g of Tritium.
Or in one liter with 1 TU there is 3e-18 *1000/18=1.7e-16g Tritium.
If you really want to know that.

But since you are talking of contaminant transport, why the hell do you want
to swich units to g/l???
The Unit TU is linear to mixing of different water masses, and as far as I
know the differential equations of contaminant transport, they work well
with TU...

So what is this good for? Use TU in your transport model!

Yours
Axel

*****************************************
Dr. Axel Suckow
Institut für Geowissenschaftliche
Gemeinschaftsaufgaben (GGA);
Institute for Joint Geoscientific Research (GGA);
Geochronology and Isotope Hydrology (S3);
Stilleweg 2;
30655 Hannover;
Phone: +49 511 6432527;
Fax:   +49 511 6433665;

-----Ursprüngliche Nachricht-----
Gesendet am: Mittwoch, 31. Januar 2001 18:14
Betreff: Re: errata

Hello Tim:

I shall be very grateful if you can review the following calculation for me.
It is based on the input received from you

3.2 pCi/L =1 TU = 2.09E7 atoms/L        (Am I right here?? How do you get
the atoms/L)

Now 3g Tritium = 6.023E23 atoms

So 1 atom of Tritium = (3/6.023E23) g

So 1TU = (2.09E7*3/6.023E23) g/L = 1.04E-16 g/L

Now 1 TU = 0.118 Bq/ L (from Clark & Fritz pp. 175)

so 1 TU = 1.04E-16 g/L = 0.118 Bq/L

Can we then say that

1.04E-16 g of Tritium = 0.118 Bq                ????

Even though Bq is a frequency unit (dps)it appears that it can be
equivalenced to mass of tritium.
I have to convert TU into a mass unit for a contaminant transport
simulation and this is the way I found

But is this valid??

I shall be very grateful for your help

Regards

:

-----Original Message-----
Sent: Tuesday, January 30, 2001 10:21 AM
Subject: [ISOGEOCHEM] errata

You are correct that 1 TU = 3.2 pCi/L, not the other way around.  Sorry for
the misinformation.  I'll go a little slower before I hit the reply button
next time.
- Tim

*****************************************************************
Timothy P. Rose
Analytical and Nuclear Chemistry Division, L-231
Lawrence Livermore National Laboratory
Livermore, CA  94550
Phone: 925-422-6611
Fax: 925-422-3160