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  1. AndresPB

    Electric Field from its Potential of a Half Circle along its Z axis

    So I figured out the potential is: dV = (1/(4*Pi*Epsilon_0))*[λ dl/sqrt(z^2+a^2)] . From that expression: We can figure out that since its half a ring we have to integrate from 0 to pi*a, so we would get: V = (1/(4*Pi*Epsilon_0))*[λ {pi*a]/sqrt(z^2+a^2)] In that expression: a = sqrt(x^2+y^2)...
  2. AndresPB

    Programs Medical Physics Graduate Programs

    Amazing Answer! You really helped me a lot with those stadistics. The research I've made seems to tell that most people consider Vanderbilt a very clinical oriented program, and that the medical physicists that come out from this University are very good. It seems that most of them go for a...
  3. AndresPB

    Programs Medical Physics Graduate Programs

    Thank you very much Choppy! Great answer, it clarifies a lot for me.
  4. AndresPB

    Programs Medical Physics Graduate Programs

    Well I've already done the research, and got every program strenghts. I wanted a new perspective if you have one about any of these programs so I can have more information, If you don't have any opinion it's ok, but if you got, you are welcome to share it.
  5. AndresPB

    Programs Medical Physics Graduate Programs

    Good night to all, I would really appreciate if everyone could give me their opinions on: MS in Medical Physics in Duke University MS in Medical Physics in Columbia University MS in Medical Physics in Vanderbilt University MS in Medical Physics in Cleveland State University Ph.D in Radiological...
  6. AndresPB

    Medical OSL Dosimetry and Build Up Region

    I understand the following image as follows: There is a build up region that varies with photons energy, the Dmax for 6 MV photons is around 1.5 cm. The build up region means that kerma > dose in that region, meaning that photons are creating electrons and when the Dmax is reached it is going...
  7. AndresPB

    Response of a System: Transfer Function

    Some time ago I made a modelling project and obtained a plot. Now, I want to remember what the transfer function was, as I want to try changing the parameters. The graph is the following: How can I obtain the transfer function? Thanks a lot
  8. AndresPB

    I Acceleration of a Particle Because of a Wave

    Hello all, I would like to know why an electron is accelerated in a linear accelerator because of the microwaves emitted by a magnetron?. Can someone tell me what are the relevant physics equations and what is the role of skin-effect here? Thanks a lot.
  9. AndresPB

    I Help with a Reference Level of Radon in Water

    Guys, I'm keep searching for a WHO standard of Radon of Water in Bq/m3 but I can't find one. Can anyone help me find some references of maximun contamination level of Radon in Water? It may be EPA, or something else too. Thanks a lot
  10. AndresPB

    Charged Particle Radiation

    That would be all thanks, you are the best. Just to get all clear, could you explain why is the distance important here? Is it because the desaceleration/aceleration happen faster when distances are short so they have to be bigger? It doesnt matter one happens via bremstrahlung and the other...
  11. AndresPB

    Charged Particle Radiation

    Thanks a lot, where can i read about its deduction?
  12. AndresPB

    Charged Particle Radiation

    Thanks a lot, could you put the formula?
  13. AndresPB

    Medical X-Ray Machines and Physics

    Ok so i think we can conclude is that the acceleration via potential difference is not enough for a good amount of x rays to produce so the bremshtrahlung or characteristic emision processes are the ones that matter for this fenomena, my last question would be why does the order of magnitute...
  14. AndresPB

    Charged Particle Radiation

    Totally awesome thanks, how can i do a fast estimation of why the accelaration due to the potential diference is insufficient?
  15. AndresPB

    Charged Particle Radiation

    Good morning all, I was just wondering the following question. When an electron is accelerated it emits electromagnetic radiation, depending on how much it is accelerated the energy varies so the frecuency does and the electromagnetic wave emitted would be of different colors or maybe even...
  16. AndresPB

    Medical X-Ray Machines and Physics

    Good morning all, I was just wondering the following question. When an electron is accelerated it emits electromagnetic radiation, depending on how much it is accelerated the energy varies so the frecuency does and the electromagnetic wave emitted would be of different colors or maybe even...
  17. AndresPB

    Medical X-Ray Machine Specifications

    The info about generation of x-rays I've already got. I'm looking for a bit more specific information like the radiation pattern of any oral x-ray machine, and the exact accelaration effectuated on a electron.
  18. AndresPB

    Medical X-Ray Machine Specifications

    Good afternoon, I'm doing a research on x-rays machines. I chose the model KL27-0.8-70 (or any oral x-ray machine). I would be very grateful if someone could provide me some technical information as the radiation pattern, the aceleration efectuated on the electrons, and the electric field...
  19. AndresPB

    I Medical Physics Question about the formula D(x)=alfa*mu*I(x)/rho

    Thanks for your answer, still don't fully comprehend
  20. AndresPB

    I Medical Physics Question about the formula D(x)=alfa*mu*I(x)/rho

    Hello I had two doubts, I know that medical physicist when working with x-rays use the formula D(x)=alfa*mu*I(x)/rho where D(x) is the dosis absorbed Alfa is the factor of the energy that damages Rho is the density mu is the absorbtion coefficient My doubt is the following: Does this formula...
  21. AndresPB

    I Why is there an energy loss in helicoidal movement?

    Already been there but I would like a more physical explanation.
  22. AndresPB

    I Why is there an energy loss in helicoidal movement?

    Hello, I was just wondering why is there an energy loss in helicoidal movement, specially in syncrotons. I know that there is energy loss because there is a production of X-rays, why this happens?
  23. AndresPB

    Coordinate Rotation

    Thank you all for your help, if it is not to much trouble can someone model a cube rotating 120° degrees throughout (1,1,1)? is there a program for doing this? Also do we need to consider if we rotate clockwise or not clockwise? Is there a convention when someone says "rotate through an axis"?
  24. AndresPB

    Coordinate Rotation

    thanks a lot, very good explanation
  25. AndresPB

    Coordinate Rotation

    Thanks a lot, can you assume the equal angeles constraints refers to the angle to the negative half axis? or can you achieve another solution?
  26. AndresPB

    Coordinate Rotation

    I mean that depending on the axis I'm rotating the solution will be diferent, I don't need a generalization, as the problem says we need to rotate 120 degrees through and axis and there is an specific solution so that the angles are equals from the original. So if i choose to rotate x2 the...
  27. AndresPB

    Coordinate Rotation

    So the answer would be (0,0,1;1,0,0;0,1,0) and in another case (0,1,0;0,0,1;1,0,0)? Each ; is another row in a matrix
  28. AndresPB

    Coordinate Rotation

    Homework Statement [/B]Hello, I am seeking help solving the following problem: find the transformation matrix that rotates a rectangular coordinate system through an angle of 120° about an axis making equal angles with the original three coordinate axes. Homework Equations none, we need to...
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