Recent content by Denver Dang

That is kind of the deal. My supervisor has told me that I (and other PhD students) would have to find textbooks etc. on our different topics. And then they would go through the material as well. So basically my topic would be about how radiation is deposited into matter (i.e. the body of a...

I am about to teach some of an introductory course for bachelor students in the field of medical physics. More specifically the topic "Photon and charged particle interactions with matter" in respect to radiation therapy (again, medical physics). I know there are a lot of topics within radiation...

Thank you very much for the great explanation :)

Ahhh, okay... So MLCs can actually be used in both cases, but it is actually the treatment planning system that is the main difference between 3D-CRT and IMRT ?

Hmmm, I actually thought, that MLCs were used in 3D-CRT, just as a static procedure, like it was done with lead blocks years back. But that is not the case ? MLCs are IMRT only ?

I'm having some trouble truly understanding the difference between these two. As far as I know, the 3D-CRT is just beams from different angles, where you can modulate the beam intensity by lead blocks custom made for each patient, cut out to fit the outline of a tumour. IMRT is when the...

I'm having some trouble understand this correctly, so I was hoping someone could enlighten me a bit :) Okay, so in the early Universe most of the hydrogen and helium was formed, and then kept in equilibrium, and ionized via photons. So we have a plasma of baryonic matter, including dark matter...

hehe, thank you for the answers :) It really made it a bit easier to understand.

Ahhh, a quite good note actually. A bit better explained than in Dodelson :) I do have a couple of questions if that is okay? 1. The left-hand side of my equation tells me how the number density of the chosen particle evolves with time. So if the right-hand side is equal to zero (As is the...

I'm currently reading about the Boltzmann equation, used for the early Universe. The equation I end up with, after some simplifications is the following: \begin{equation} a^{-3}\frac{d}{dt}\left(n_1a^3\right) = n_1^{(0)}n_2^{(0)}\langle\sigma v\rangle\left[\frac{n_3 n_4}{n_3^{(0)}n_4^{(0)}} -...

Once again, thank you very much :) It was very informative.

Thanks for the enlightening, it really made many of my questions clear :) But, if you don't mind, I would like to know the neutrino thing, if it's not too much to ask? I've read a lot of things about it, but it hasn't really been very detailed, so I pretty much just end up getting something...

I've gotten a bit confused about the creation of the neutron star/pulsar, so I was hoping someone could point me in the right direction :) As fusion stops, when reaching the iron phase, the outer layers (hydrogen, helium, carbon... etc.) gets pulled in-wards do to gravity. This creates a bounce...

Ah, I see what you mean now. Sorry for the confusing on my part. Thank you very much :)

Hmmm, I'm not sure I follow. How does that help me ?