Home | Community | Message Board

NorthSpore.com BOOMR Bag!
This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: Myyco.com Golden Teacher Liquid Culture For Sale   Kraken Kratom Red Vein Kratom

Jump to first unread post Pages: < Back | 1 | 2 | 3  [ show all ]
OfflineHematite
Newbee
Male User Gallery


Registered: 05/04/07
Posts: 156
Loc: Wisconsin
Last seen: 11 years, 6 months
Re: Mystery pic [Re: Ferris]
    #8915056 - 09/11/08 08:42 PM (15 years, 8 months ago)

The uranium originated in granite that was weathering away to the west of where the dinosaur was buried, during the first uplift of the Rockies. Oxidized uranium is water soluble while reduced uranium is not. Groundwater carried the oxidized uranium from where it weathered in the mountains to where the dinosaur was buried, where it encountered a reducing environment-- possibly created by the slow decay of the dinosaur's soft tissues-- where it precipitated (pyrite also forms under reducing conditions). It is possible that some of the iron and sulphur originated in dinosaur tissues, or they could have ben carried in in groundwater as well.

This particular bone was about 1% uranium-- which I discovered is enough for it to sustain a chain reaction when bombarded by enough thermal neutrons, as in the core of a nuclear reactor.

Extras: Filter Print Post Top
InvisibleMinstrel
Man of Science
Male User Gallery


Registered: 03/15/05
Posts: 1,974
Loc: Hogtown
Re: Mystery pic [Re: Hematite]
    #8915131 - 09/11/08 08:57 PM (15 years, 8 months ago)

>This particular bone was about 1% uranium-- which I discovered is enough for it to sustain a chain reaction when bombarded by enough thermal neutrons, as in the core of a nuclear reactor.

Really?  Even though this 1% is natural U238 which cannot sustain a chain reaction?  Doesn't U238 not release any neutrons when fissioning, and hence, cannot sustain it's own reaction?  Doesn't it need to be U235, and even if that 1% was all U235, doesn't there need to be enough to cause criticality? 

U238 will fission if hit with fusion neutrons, I know (as in a thermonuclear bomb's tamper/case), but those neutrons must come from an outside source.

I bet Seuss will know for sure.


--------------------

Edited by Minstrel (09/11/08 09:04 PM)

Extras: Filter Print Post Top
InvisibleFerris
PsychedelicJourneyman
Male

Folding@home Statistics
Registered: 03/12/06
Posts: 11,529
Re: Mystery pic [Re: Minstrel]
    #8915201 - 09/11/08 09:12 PM (15 years, 8 months ago)

Bombarding the U238 with neutrons causes neutron absorption, temporarily converting the material to U239, which is a fissible isotope

EDIT: ah, I guess you understand that much


--------------------

Discuss Politics

Edited by Ferris (09/11/08 09:16 PM)

Extras: Filter Print Post Top
InvisibleMinstrel
Man of Science
Male User Gallery


Registered: 03/15/05
Posts: 1,974
Loc: Hogtown
Re: Mystery pic [Re: Minstrel]
    #8915277 - 09/11/08 09:24 PM (15 years, 8 months ago)

As I understand, it is the difference between fissile and fissionable.  The former can chain react, the latter can't.


--------------------

Extras: Filter Print Post Top
InvisibleFerris
PsychedelicJourneyman
Male

Folding@home Statistics
Registered: 03/12/06
Posts: 11,529
Re: Mystery pic [Re: Minstrel]
    #8915321 - 09/11/08 09:34 PM (15 years, 8 months ago)

:lol: fissile. That's the word I was going for.

I suspect that you don't need a chain reaction to occur for power production, although I wouldn't quote me on that.


--------------------

Discuss Politics

Extras: Filter Print Post Top
OfflineHematite
Newbee
Male User Gallery


Registered: 05/04/07
Posts: 156
Loc: Wisconsin
Last seen: 11 years, 6 months
Re: Mystery pic [Re: Minstrel]
    #8915396 - 09/11/08 09:48 PM (15 years, 8 months ago)

Quote:

Minstrel said:
>This particular bone was about 1% uranium-- which I discovered is enough for it to sustain a chain reaction when bombarded by enough thermal neutrons, as in the core of a nuclear reactor.

Really?  Even though this 1% is natural U238 which cannot sustain a chain reaction?  Doesn't U238 not release any neutrons when fissioning, and hence, cannot chain react?  Doesn't it need to be U235, and doesn't there need to be enough to cause criticality? 

Seuss?




"Sustained chain reaction" was a poor choice of words, you're right. What I should have said is that when bombarded my slow neutrons, the bone produces enough of its own neutrons to boost substantially the rate of fission in it. When it came out of the reactor it was more loaded with fission products than could be explained by the reactor's neutron flux alone. So there was a chain reaction, but a self-quenching one.

Extras: Filter Print Post Top
OfflineHematite
Newbee
Male User Gallery


Registered: 05/04/07
Posts: 156
Loc: Wisconsin
Last seen: 11 years, 6 months
Re: Mystery pic [Re: Ferris]
    #8915437 - 09/11/08 09:56 PM (15 years, 8 months ago)

Quote:

Ferris said:
Bombarding the U238 with neutrons causes neutron absorption, temporarily converting the material to U239, which is a fissible isotope

EDIT: ah, I guess you understand that much




238 also can undergo fission directly, but neutron capture is more likely with slow (thermal) neutrons. 235 does not undergo fission with fast neutrons while 238 does.

Extras: Filter Print Post Top
OfflineN2loma
Foaming Pipe Snake
Male User Gallery


Registered: 05/17/08
Posts: 925
Last seen: 14 years, 7 months
Re: Mystery pic [Re: zouden]
    #8935910 - 09/15/08 08:54 PM (15 years, 8 months ago)

bone?


--------------------
"So can you tell me what exactly does freedom mean/
If I'm not free to be as twisted as I wanna be" -Divide by Disturbed

Good Guitars Don't Cry

Extras: Filter Print Post Top
OfflineHematite
Newbee
Male User Gallery


Registered: 05/04/07
Posts: 156
Loc: Wisconsin
Last seen: 11 years, 6 months
Re: Mystery pic [Re: N2loma]
    #8935923 - 09/15/08 08:57 PM (15 years, 8 months ago)

Yes

Extras: Filter Print Post Top
Jump to top Pages: < Back | 1 | 2 | 3  [ show all ]

Shop: Myyco.com Golden Teacher Liquid Culture For Sale   Kraken Kratom Red Vein Kratom


Similar ThreadsPosterViewsRepliesLast post
* PIC Microcontrollers zeta 2,511 17 01/30/04 06:36 AM
by Seuss
* resizing pics oggleman 591 4 03/12/04 10:33 PM
by Hanky
* Awesome pics! Mercury passes across Sun TackleBerry 1,286 10 05/13/03 02:07 AM
by ExtravagantDream
* Arcade Machine Difficulties *PICS* gir 832 6 09/01/03 01:40 AM
by gir
* My digital camera makes blurry pics T0aD 706 3 01/19/03 09:11 AM
by T0aD
* how can i make my pic less kb? Sterile 1,585 4 05/09/04 12:43 PM
by ekomstop
* Looking for Tongue Diagram-Gross Pic Added 1/9 Joshua 22,554 16 01/14/04 11:09 PM
by DisoRDeR
* Are you using incriminating pics and don't know it Lana 597 0 09/26/01 05:43 PM
by

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: trendal, automan, Northerner
3,701 topic views. 0 members, 0 guests and 1 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.017 seconds spending 0.004 seconds on 12 queries.