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August 2010

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 20 Aug 2010 14:58:35 -0500
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Hi folks - here is the Friday Element Quiz Question and Answer:


The Question:

I am an element that was first produced in 1828 but was identified 
centuries earlier. Peak demand for this element was in the 1960s. This 
element has been extensively studied for possible use in reactor fuel 
breeding but only one master alloy is commercially available. The dominant 

isotope of this element has a half life of 1.41 x 1010 years. This 
element's compounds were part of an invention in 1891 and  have been a 
significant part of people's camping experience. This element comprises 
8.1 ppm of the earth's crust. What element am I?

The Answer:

The element is Thorium (Th). Thorium oxide (ThO2)was part of the 
incandescent gas light mantle patent (which I didn't know myself until 
today). Gas camping lanterns have woven cotton mantles that are soaked in 
a ThO2 and Ce(NO3)3 solution. The cotton burns away when first lit leaving 
a delicate web of sintered nitrate residues. The ThO2 has low thermal 
conductivity and supports/insulates the CeO2 particles which catalyze gas 
combustion.  Today, U.S manufacturers have substituted Yttrium to avoid 
the regulatory costs associated with Th. 


The winner of the quiz is Bev Christian, RIM, will get the services of 
Clumpy, the 8th dwarf, for one task. Bev - you will need to let us know 
what Clumpy accomplished for you.


Everyone have a good weekend.

Dave Hillman
Rockwell Collins
[log in to unmask]

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