does anyone know where can i find data on the variation of natural radiactivity with depth?
400811
Well, from what I know, there are two major concentrations of radioactive elements and isotopes: The Earth's core, where heavy elements differentiated from lighter ones while the Earth was molten about 4 billion years ago, and the crust, where more recent processes have allowed radioactive elements to exist. I guess your variation would be up- down -up. Sorry, I don't know where I learned this, so I can't give you a definate source. However, from my exerience, Wikipedia knows pert near everything, so maybe try it.
529607
If you have access to the Journal of Applied Physics, this should help:\nhttp://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000076000009005380000001&idtype=cvips&gifs=yes
915800
http://www.sciencebuddies.org/mentoring/project_ideas/home_Phys.shtml?gclid=CNDljtrK6IgCFQ7eSgodNw4Ssg\n\nthere are MANY projects available getting more complex as you come to the bottom of the page.
864425
One source that breaks down these classifications by temperature, or maybe it was only color photometry (I don't recall) is Kenneth Lang's Astrophysical formula:\n\nhttp://www.amazon.com/Astrophysical-Formulae-Radiation-Processes-Astrophysics/dp/3540296921/sr=1-1/qid=1163374728/ref=sr_1_1/102-7735916-8685767?ie=UTF8&s=books\n\nVolume I has some tables I think you will find helpful.  You might need to do a little interpolation...\n\nanother place to look would be the iau website http://www.iau.org . The IAU is the kind of group that would define a standard, though this might be too detail oriented for them to mess with.\n\nYou will be hard pressed to find an equation, however.  You are going to be stuck with a lookup table.
53189
http://tigger.uic.edu/~mansoori/Thermodynamic.Data.and.Property_html\nhttp://www.aii-usa.com/proezgc/database.htm\nhttp://theweatherprediction.com/thermo/images/\nhttp://www.lib.utexas.edu/chem/info/thermo.html
138925
YES\n\nhttp://www.flux.utah.edu/~aclement/templair/collection/Unknown%20-%20Unknown%20-%20A%20dragon%20in%20a%20cave.jpg\nOR\nhttp://graphics.stanford.edu/data/3Dscanrep/dragon.jpg\n\nJUST GO TO GOOGLE AND CLICK THE IMAGES LINK ABOVE THEN TYPE WHAT YOU WANT...
513176
Try http://googleearth.com\nMaster.
978796
Study of data with respect to different spectral responses
497601
You might try searches at\n\nhttp://www.scirus.com/srsapp/\n\nhttp://www.scienceresearch.com/search/
545899
sciencedirect.com\n\nif you're accessing from a university or  library, you'll be able to search the database.
2133
CRC Handbook of Chemistry and Physics is likely the only source. Nothing online I could find. Check your local university library. It's there.
786396
hi, try this link .. its a nice one ..\n\nhttp://eo.ucar.edu/rainbows/
834583
You can use the Rydberg formula, which relates the reciprocal of the wavelength of the photon absorbed or emitted to the squares of the reciprocals of the principal quantum numbers.\n\n1/wavelength = R(1/n_l^2 - 1/n_u^2)\n\nSo, for the listed values of n, \n\nA.  1/w = R(1/ 2^2 - 1/4^2) = 0.1875R\nB.  1/w = -0.75R\nC.  1/w = 0.21R\nD.  1/w = -0.04861R\n\nSince energy and frequency are proportional to 1/wavelength,\nlooks like the order is D, A, C, B.
436244
here's a link to a picture of the em spectrum along with corresponding wavelengths for each type of radiation:\n\nhttp://kingfish.coastal.edu/marine/Animations/Images/Electromagnetic-Spectrum-2.png
179131
Try this:\nhttp://kr.cs.ait.ac.th/~radok/physics/f3.htm
216148
GO to www.noaa.com... you can get everything under the sun from this site.
694764
Try this site \n\nhttp://en.wikipedia.org/wiki/High_Frequency_Active_Auroral_Research_Program