Platinum

This area is for the discussion of what's new, what's on your mind, and general photographic topics. A place to meet, make comments on this site, and get the latest community news.

Moderators: Pau, rjlittlefield, ChrisR, Chris S.

Beatsy
Posts: 1648
Joined: Fri Jul 05, 2013 3:10 am
Location: Malvern, UK

Platinum

Post by Beatsy »

I recently found a small (31 x 3.5 x 0.05mm) strip of platinum in a random bits box. Roughly a tenth of a gram or so. It's the straightened-out heating element from a needle puller. Not worth chopping in for bullion, my left sock is probably worth more, so I kept it. But now it just sits there being irritatingly boring, nonreactive platinum and I can't think of anything interesting to do with it, or use it for.

Surely, there must be *something*!

Any ideas...?

mawyatt
Posts: 2479
Joined: Thu Aug 22, 2013 6:54 pm
Location: Clearwater

Post by mawyatt »

Research is like a treasure hunt, you don't know where to look or what you'll find!
~Mike

Sym P. le
Posts: 48
Joined: Thu Jul 04, 2019 9:53 pm
Location: BC

Post by Sym P. le »

Heavy! 8)

JW
Posts: 165
Joined: Wed Feb 23, 2011 7:38 am
Location: New Haven, CT, USA

Post by JW »

Form it into a loop with handle, and use the looped end as a holder to burn stuff in a flame

Stick it in hydrogen peroxide (must be clean) and make some H2 and O2 bubbles - may be a slow reaction, though
It's not what you look at that matters, it's what you see - Henry David Thoreau

Smokedaddy
Posts: 1710
Joined: Sat Oct 07, 2006 10:16 am
Location: Phoenix, Arizona
Contact:

Post by Smokedaddy »

... isn't platinum radioactive?

ChrisR
Site Admin
Posts: 8560
Joined: Sat Mar 14, 2009 3:58 am
Location: Near London, UK

Post by ChrisR »

Smokedaddy wrote:... isn't platinum radioactive?
I think that would be plutonium, Jim ;)
Chris R

Smokedaddy
Posts: 1710
Joined: Sat Oct 07, 2006 10:16 am
Location: Phoenix, Arizona
Contact:

Post by Smokedaddy »

Six naturally occurring isotopes of platinum exist: platinum-190, platinum-192, platinum-194, platinum-195, platinum-196, and platinum-198. Of these, only platinum-190 is radioactive. ... These isotopes are produced when very small particles are fired at atoms. These particles stick in the atoms and make them radioactive.
Last edited by Smokedaddy on Thu Mar 05, 2020 9:20 am, edited 1 time in total.

Smokedaddy
Posts: 1710
Joined: Sat Oct 07, 2006 10:16 am
Location: Phoenix, Arizona
Contact:

Post by Smokedaddy »

I was thinking you could make a Cloud Chamber.

https://www.youtube.com/watch?v=yJjJ_FCI7Uc&t=1s

-JW:

rjlittlefield
Site Admin
Posts: 21028
Joined: Tue Aug 01, 2006 8:34 am
Location: Richland, Washington State, USA
Contact:

Post by rjlittlefield »

Smokedaddy wrote: platinum-190 is radioactive
...
was thinking you could make a Cloud Chamber
Right, but check the half-life and abundance. https://en.wikipedia.org/wiki/Isotopes_of_platinum says 6.5E+11 years and 0.012% .

I'm also seeing atomic weight of 195 gm/mole and density of 21.45 gm/cm^3 .

From there, my spreadsheet works the sums as...

mass of Beatsy's sample = (31mm x 3.5 mm x 0.05 mm) * (0.001 cm^3/mm^3) * (21.45 gm/cm^3) = 0.116 gm
moles of Beaty's sample = 0.116 gm / 195 gm/mole = 0.000597 moles of mixed platinum
moles of Pt-190 = 0.000597 * 0.012% = 7.16E-08
atoms of Pt-190 = 7.16E-08 *6.02E+23 (Avogadro's number) = 4.31E+16
disintegrations/year = 4.31E+16 * 0.5 / 6.5E+11 = 3.32E+4
disintegrations/second = 3.32E+4 / 3.15E+07 = 1.05E-03
seconds/disintegration = 1/1.05E-03 = 950

So, roughly 1 disintegration every 16 minutes, for Beatsy's sample?

That's more than I expected, but might be a little boring anyway. :(

--Rik

Bob-O-Rama
Posts: 65
Joined: Sat Dec 06, 2014 6:46 am
Location: Allentown, PA, USA, Earth, etc.
Contact:

Post by Bob-O-Rama »

I have some 1oz platinum crucibles my dad used in grad school. He kept the original receipt from the Syracuse U bookstore c. 1962 in his papers: they were $12 each.

There are a lot of catalytic reactions you can demonstrate with a small piece like you have.

https://www.youtube.com/watch?v=rsIhjinuBYA

https://www.youtube.com/watch?v=bBBy4-0uUC4

Post Reply Previous topicNext topic