Recent content by tirwit

Hi! How did you get: du = (8*pi/c^3)[hv/(exp(hv/kT)-1)]v^2*dv ? This is very urgent please :)

I think I found something that will help me. The PDF, in case you're interested is at: http://files.me.com/pedro.gordo/v8t4pd Quadric surfaces are in the section 5.2. Tirwit

I wanted something more extensive, if you know what I mean :) Wikipedia and Wolfram were the first places I went. As for books I found a reference to it in Riley's "Mathematical Methods for Physics and Engineering" but it was nothing special.

Hi! I need to know how to work with quadric surfaces to draw a 3D structures in a code. However I have no idea how to do this. I can't find any place in the internet where they explain quadric surfaces for newbies... Can someone point me in the right direction, please? I didn't post this...

Hi! I need to know what's the "hard bremsstrahlung emission". I googled it but it only showed papers (and few because my university don't have access to many) on experiences that at some point mention this effect but don't explain it. I know what's bremsstrahlung emission, just don't know...

Following your method I also checked the datasheet for 60Co. The listed branching ratio in the bottom of the page was 1. Which would give the same 0,99 intensity for the two 60Co main gammas, when it should give 0,5 for each gamma. Am I confusing the concepts?

Nah, the code example is right ;). It comes in the PENELOPE package. It's a Monte Carlo Simulation for energy loss of particles in materials. It's used, among other things, to calibrate the efficiency of radiation detectors. It's driving me crazy lol :eek: My supposition is that for a...

Homework Statement Obtain the solution of the diffusion equation, u(t,x) a) satisfying the boundary conditions: u(t,0)=u1, u(t,l)=u2, u(0,x)=u1+(u2-u1)x/l+a.sin(n\pix/l); b) in the semi-plane x > 0, with u(t,0)=u0+a.sin(\omegat). Homework Equations Wish I knew... The...

So when I'm writing the code and the instructions for the source definition say: C SPECTR : For a source with continuous (stepwise constant) spectrum, C each 'SPECTR' line gives the lower end-point of an energy C bin of the source spectrum (Ei) and the associated...

The table for nuclide search for Co60 at http://ie.lbl.gov/toi/nuclide.asp?iZA=270060, give intensity for it's 2 main gammas. Each gamma has a intensity of approximately 99,9%, but these 2 if sum, give more than 100%. But, for Co60 (a simple case just to demonstrate), we know that each of those...

Ah ok ;) Thanks both :)

I'm reading Riley's "Mathematical Methods for Physics and Engineering" and I came across this expression about vector spaces: "A set of objects (vectors) a, b, c, ... is said to form a linear vector space V if the set is closed under commutative and associative addition (...)" What I don't...

Hi! This is a very basic question. How do I calculate the total probability for a certain gamma of a decay? For example, I know from empiric method that the 2 gammas from Co60 have a probability of 50%. But for Eu152 I have lots of gammas and I need to compute them all in a simulation program...

Homework Statement Write the del operator in spherical coordinates? Homework Equations I wrote the spherical unit vectors: \hat{r}=sin\theta.cos\phi.\hat{x}+sin\theta.sin\phi.\hat{y}+cos\theta.\hat{z} \hat{\phi}=-sin\phi.\hat{x}+cos\phi.\hat{y}...