nuclear power in space
DESCRIPTION
TRANSCRIPT
![Page 1: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/1.jpg)
Nuclear Power in Space
![Page 2: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/2.jpg)
In the 1950’ s space programs used…
![Page 3: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/3.jpg)
lightweight batteries
![Page 4: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/4.jpg)
fuel cells
![Page 5: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/5.jpg)
And…
![Page 6: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/6.jpg)
solar modules
![Page 7: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/7.jpg)
to produce electricity
![Page 8: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/8.jpg)
But missions started to become more difficult!
![Page 9: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/9.jpg)
So…
![Page 10: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/10.jpg)
The option was to use nuclear energy. NASA assembled the radioisotope thermoelectric generators. (RTG)
![Page 11: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/11.jpg)
What is RTG?
![Page 12: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/12.jpg)
RTG is a generator that converts heat into electrical energy.
![Page 13: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/13.jpg)
RTG uses the heat released by plutonium during its alpha decay. (238Pu)
![Page 14: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/14.jpg)
But how does this happen ?
![Page 15: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/15.jpg)
Plutonium breaks down and as it decays it generates heat.
![Page 16: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/16.jpg)
Then heat will be converted in electrical energy.
![Page 17: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/17.jpg)
NASA use plutonium because it has a half-life of 87.74 years. When it decays it becomes 237Np.
![Page 18: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/18.jpg)
What is the structure of RPG?
![Page 19: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/19.jpg)
It is made of a container full of radioactive material. As it decays it heats where thermoelectric generators are.
![Page 20: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/20.jpg)
When was the first satellite with RTG launched?
![Page 21: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/21.jpg)
It was sent in space in 1961 and it functioned for 15 years.
![Page 22: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/22.jpg)
Spacecraft, landers, satellites, and probes are functioning thanks to RTG.
![Page 23: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/23.jpg)
The missions Apollo 12-17 used RTG. RTG is used for navigational, meterological and for communications sattelites.
![Page 24: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/24.jpg)
RTG is mostly used for probes far away from the sun where solar panels can’t receive light.
![Page 25: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/25.jpg)
There are other space applications that use nuclear
power.
![Page 26: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/26.jpg)
There is another device that is used in spacecrafts, satellites and probes. It is called Radioisotope heater unit (RHU)
![Page 27: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/27.jpg)
It uses radioactive material to produce the heat to activate electronic instruments that cannot work at cold temperatures.
![Page 28: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/28.jpg)
Is RTG safe?
![Page 29: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/29.jpg)
It’s safe because it doesn’t produce heat by nuclear fission so there isn’t the formation of nuclear waste
![Page 30: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/30.jpg)
But . . .
![Page 31: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/31.jpg)
A radiactive contamination may occur
![Page 32: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/32.jpg)
It may happen that nuclear power will have to increase now that areospacial engineers are working for travel in the orbit for people.
![Page 33: Nuclear Power In Space](https://reader033.vdocuments.net/reader033/viewer/2022061200/5474a03bb4af9f980a8b5704/html5/thumbnails/33.jpg)
http://www.absoluteastronomy.com/topics/Radioisotope_thermoelectric_generator
http://en.wikipedia.org/wiki/Plutonium
http://www.wisegeek.com/what-is-a-radioisotope-thermoelectric-generator.htm
http://www.qrg.northwestern.edu/projects/vss/docs/Power/1-what-are-rtgs.html
Sources
http://www2.jpl.nasa.gov/galileo/messenger/oldmess/RTG.html
http://search.nasa.gov/search/search.jsp?nasaInclude=probes
http://en.wikipedia.org/wiki/Radioisotope_heater_unit http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator#Safety