# Search results

1. ### 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. ### 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...
3. ### 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...
4. ### 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
5. ### 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.
6. ### 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

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...
8. ### 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...
9. ### 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...
10. ### 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...
11. ### 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?
12. ### 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...