Slashdot Mirror
NASA's Plutonium Supply Dwindling; ESA To Help
astroengine writes "NASA's stockpile of the plutonium isotope Pu-238 is at a critical level, causing concern that there won't be enough fuel for future deep space missions. Pellets of Pu-238 are used inside radioisotope thermoelectric generators (or RTGs) to generate electricity for space probes traveling beyond the orbit of Mars — solar energy is too weak for solar arrays at these distances. Blocked by a contract dispute with Russia to supply Pu-238 and the US Department of Energy that has not been granted funds to produce more of the isotope, NASA lacks enough of the radioisotope to fuel the future joint NASA-ESA mission to Europa. However, the head of the European Space Agency has announced that they have plans to commence a new nuclear energy program to alleviate the situation."
Pardon my ignorance and possible first post - but couldn't NASA just recycle some retiring nuke warheads for plutonium?
Oh, yes, any moron in Slashdot is a rocket scientist.
No, they can't. Nukes have Pu-239 (the fissile isotope), and they need Pu-238 (the alpha emmiter).
They just need to construct additional pylons. Problem solved.
What is the airspeed of a fully laden swallow?
Even on Mars, the MER rovers use RHUs (radioactive heating units) to keep the electronics warm during the Martian night and winter. Ditto for most any mission going beyond the Earth's orbit, especially for landers (which see night).
An orbiter can conceivably be pointed to the sun, but the solar constant is pretty low. Jupiter is 5 AU away from the sun, so the solar constant is 1/25th of Earth: a monster 40 Watts/square meter. Compare this to radiation cooling to cold sky which is about 100W/square meter. Better have pretty good insulation, which takes volume and mass, both in short supply on a spacecraft.
Juno has enormous solar panels, which raise all sorts of practical problems.
You've got to decide whether you want to burn your mass allocation on solar panels or on science instruments.
We only made it in the US at Hanford and Savannah River, both of those are shut down now.
It's very toxic, very hard to work with and very flammable and very much controlled, so thats why no private companies are in the market to produce it.
To produce Pu-238 you produce a ton of weapons grade plutonium, do we really need more of that crap churned out?
http://www.fas.org/nuke/intro/nuke/plutonium.htm
You have issues dude. I identify myself as Muslim and it's a creed, but science-wise "Muslims" (Middle East) have lost it (i.e. stop being mad about it).
Yes, Algebra and Algorithm are Arabic words traced to the amazing Mohammed Ibn Musa Al-Khawarizmi (who was "Persian" btw, yes, the people we intend to bomb), and f#@king YES, India was there first.
But that doesn't take from him (or his civilization/creed) the right to call the names.
(For the purposes of this post, I will interchange creed and civilization, even though they're far-far-FAR from being the same thing).
It's a phenomenon Neil Degrasse Tyson describes as "Naming Rights" (I'm no scholar, so maybe it has another name). But basically, when a nation/region excels and innovates, they get the right to name their discoveries and they effectively "own" them.
Why is the rest of the world using .hk, .uk and .whatever domains? Why is the US the only country that enjoys .gov, .mil and .edu without a trailing .us?
Because, this s$#t was invented here, and "we"* earned it.
Jupiter, Venus, Mars, Pluto.. all Greek mythology names, why? They were "it"** back in the day.
So, what happened to the Muslim world? Well, Al-Ghazali decided to take them 300 years back into oblivion.
No scientist/mathematician/programmer/thinker/etc. would ever express prejudice. Empathy and sorrow for ignorance, maybe, but not hatred.
Now... where are we? We have racism (been to AZ lately?), prejudice (Muslim/Jew/*INSERT RELIGION* haters) and a whole lot more.
A lot of Americans do not believe in evolution or other scientifically proven facts. We kill our enemies for our "god-given" rights and we (the majority of us) want religion taught in school.
I wonder if GWB was our "Al-Ghazali", or maybe it will be Obama. Whomever it is, we must stop it and freaking move forward. Otherwise, we're fscked. We'll be the nation that our grandchildren and history talks about as "they invented XYZ, but muhahaha, look at them barbarians." And the elite nations at the time will nuke the ish out of them for being so backwards.
I want us to prevail, but with attitudes like yours and the extreme ignorance level the populace have, I'm afraid it's already too late.
I better start learning Chinese (Ni Hao) :(
And finally; to be on-topic; NASA needs to get some more of that "shiz-nit" :P
----
* I'm kind of one of you("us") now!
** A.K.A. The $h#t
If you can't mod them join them.
Pardon my ignorance and possible first post - but couldn't NASA just recycle some retiring nuke warheads for plutonium?
Oh, yes, any moron in Slashdot is a rocket scientist.
No, they can't. Nukes have Pu-239 (the fissile isotope), and they need Pu-238 (the alpha emmiter).
Apparently actual Slashdot rocket scientists are also assholes.
- Not GP, but a rocket scientist who thought it was a reasonable question.
Thanks! and I whole-heatedly agree with you!
I recently watched The Unthinkable (if you haven't watched it, it's a great movie), and as to not spoil it for anyone, all I can say is that I was sitting at the edge of my seat and rooting for Samuel Jackson throughout the movie.
Bin Laden is an a$$hole, and the 72 virgins (myth) will be well-hung top-men scavenging his and his goons' cavities while slow-roasting them to perfection (yes I hate them as much as you do, probably even more so).
The stories that have been hitting Slashdot about censorship in Pakistan and other Islamic countries gathered quite a few "look at them backwards Muslims", instead of generating empathy about the sad state of these countries.
I should know, I lived in a couple of them growing up. People are afraid for their lives and cannot speak up. People can't discuss politics in coffee shops, because that guy smoking hooka is new and he might be from internal affairs, and if he marks you, your family won't even know what happened to you (Egyptian NSA-equivalent calls it "sending someone behind the sun").
America used to be the great nation everyone there talked about. It was wonderland, where you can criticize leaders and "be alive the next day". Where your creed and background did not matter, only what you knew and what you can do.
But somehow when we started meddling with their affairs, we became the villain. There's an Arabic saying that goes something like "Me and my brother would fight my cousin if he does us wrong, but if a stranger comes in, my cousin and I will team up".
The solution is _not_ to go into these countries with military force to "spread freedom", the solution is to stand up against tyranny with words, show them an example of democracy over here and not to co-operate with their regimes to oppress people.
Final words: Any kind of zealotry (religious/nationalistic/software) is ignorant, and I hope that I see a world without hatred before my time is up here. I doubt it, but I'm still an optimist inside and one can dream.
If you can't mod them join them.
They've got a critical amount of Pu-238 and they want more?