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Fw: Radon in LP Gas







>

>-----Ursprüngliche Nachricht-----

>Von: Tad Blanchard <Tad.M.Blanchard.1@gsfc.nasa.gov>

>An: radsafe@list.vanderbilt.edu <radsafe@list.vanderbilt.edu>

>Datum: Freitag, 20. Juli 2001 22:49

>Betreff: Radon in LP Gas

>

>

>>Hello all,

>>

>>Someone called me this morning and I couldn't give them an answer to this

>question. They wanted to know if there was any significant amounts of Radon

>in Liquid Propane Gas. If someone has information on this, please post a

>link on the radsafe list.

>>

>>I seem to recall seeing something about radon in "natural" gas but nothing

>about LP gas.

>

>

>Tad,

>

>As a first information I can tell you the following:

>

>During production of LPG radon, which has a boiling point in the range

>of -50 C, is concentrated in the LPG. (Radon always accompanies natural

>gas.) Since LPG is usually not used right after production, but stored in

>tanks, the radon will decay (half life 3.8 d). Equipment like pumps and the

>tanks themselves will be contaminated by the accumulated longlived decay

>products like Pb-210 and Po-210. These might pose a radiation hazard by

>inhaling them, when for instance pumps are taken apart and cleaned. The

>accumulation in tanks should not play a big role by external radiation,

>especially because of the shielding effect of steel.

>

>I remember some papers - (one of) the first might have been a paper by

>Howard Pritchard.  I do not have them at hand - they are in my office, but

>they are of course not available on the web.

>

>If this information is not enough, please contact me and I would look on

>Monday into my literature collection.

>

>Best regards,

>

>Franz

>

>

>



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