Gamma ray Definition and 131 Threads

Hey everyone, I need to be able to be able to explain how a gamma spectrometer (NaI scintillator) can determine the energy of a given gamma ray (or more particularly, determines the effective dose rate, but that shouldn't be to hard once I figure out how to get the energy). The problem, as far...

From what i have read the gamma ray frequency cap ranges from 3×10^19 to 3×10^24. I want to know what you guys have heard it is. Are the highest measured gamma ray from a supernova calculated with any time dialated effects? Also what is the thoertical cap of something higher than a gamma ray...

Hello, I'm attempting to analyse the data recovered from an experiment that I performed in lab, but I'm having some problems understanding how to properly apply the statistical methods learned to this specific problem. Essentially, the experiment consisted of placing a source of gamma rays...

Okay, I'm writing a short response of about one page right now. Here's the question: Regarding soft gamma ray repeaters, 1. Is there any connection between the electromagnetic radiation and gravitational radiation? (specify: luminosity of the source? Thresholds?) and 2. How much...

I was reading this: https://www.physicsforums.com/showthread.php?t=181830 I was wondering if there is any up to day info about the speed of gamma ray burst that could confirm or debunk these claims. Or are LQG and String Theory in troubles?

http://www.sciencedaily.com/releases/2008/09/080919185809.htm * "This is the most amazing burst Swift has seen," said the mission's lead scientist Neil Gehrels at NASA's Goddard Space Flight Center in Greenbelt, Md. "It's coming to us from near the edge of the visible universe."...

Very cool image. Does anyone know, is anything in the information we got from this so far at all surprising? Is it likely we will learn anything about gamma ray bursts from this or is more information

In gamma-ray spectrometry with germanium detector, the summing effects have to be taken into account at low source detector distance. The peaks due to coincidence summing of X+X, X+gamma, gamma+gamma rays can complicate the spectrum obtained by this type of detector and significantly change the...

Hi, Atmospheric gamma-ray extensive air showers are induced by pair-production interactions. The equation that governs pair production is: \gamma + \gamma = e^- + e^+ My understanding of the interaction is that a gamma passes "close" to the electric field of a nucleus. The nucleus acts...

questions about life of gamma ray particle question-are gamma ray particles unchanged after gamma ray burst 13 billion years ago? question-are changes detected not due to travel through normal space, scattering? changes due to dark matter/energy? question-positronium decay at end universe...

Homework Statement a) A back-of-the-envelope calculation shows that in about 120 seconds the gamma ray burst released a total energy of about 10^48 Joule. How does this compare to the total energy that would be released by instantly vaporizing our sun into pure energy? (The sun's mass is...

If the exploding star that caused the gamma ray burst on Wednesday had occurred as close to us as Alpha Centauri what would be the effect on Earth?

Homework Statement Find the frequency and wavelength of a 100 MeV gamma ray photon Homework Equations 100 MeV=1.602 X 10^-11 The Attempt at a Solution I do not know how to do this. I am in a class for elementary teachers and we have to solve this problem.

Does a gamma ray ray carry enough information to prove its source?

On February 1, 2007, the Konus-Wind, Integral, Messenger, and Swift gamma-ray satellites measured a short but intense outburst of energetic gamma rays originating in the direction of M31, the Andromeda galaxy, located 2.5 million light-years away. The majority of such short (less than two...

Hey guys having a bit of problem with my year 1 essay. Would really appreciate any help :) What are the main sources of gamma ray bursts both short and long duration? I know some are from supernovae but where do others come from?

I was watching a show on Discovery about things that could end the Earth and one of them was a Gamma Ray Burst. They said on the show that by the time we knew it was coming towards us, it would be too late but if it moves a the speed of light or slower wouldn't that mean that we would see the...

Hello Guys! Please help me in this question: What is the nature of the gamma ray bursts? Why do they last for mo only 2 seconds? thx!

When an electron and anti-electron come together a gamma ray is produced. So are gamma ray bursts just the product of lots of electrons and anti-electrons coming together? I gather that at least twice the mass of our Sun is required for a gamma ray burster to form,so if we have two masses and...

Last night I was watching a show on the science channel about astronomy. The show was very interesting but it was after my bed time and I fell asleep when they were talking about the mysterious origin of gamma ray burst. Last I remember they were talking about the burst coming from the early far...

If we could produce the highest order of Gamma Ray energy of a single photon and bombarded an Atom with direct precision, Would the Atom be Annihilated? If the Atom is Annihilated then would the release of Energy of the Atom be greater than the Single High Energy Gamma Photon? Assume that...

http://arxiv.org/abs/astro-ph/0506520 Title: Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV Authors: Kyungjin Ahn Eiichiro Komatsu Comments: 5 pages, 3 figurs; submitted to PRD, Rapid Communication The origin of the cosmic gamma-ray background at 1-20 MeV...

I've been searching the internet for a reasoanable explanation for the fenomenon and one observation of a GRB 8 billion light years from Earth tranformed 1.3 times the mass of the sun into gamma radiation and 16 days later they detected a new blue galaxy with stars already forming. Can someone...

i heard some breaking news about a gamma ray emission which is confusing some scientists. did anyone heard about it?

What is the recoil energy (in eV) of a 57Co nucleus emitting a 14.4 keV gamma ray? If anyone knows the equation that I can use, thanks.

A Fe (57) atom is in an excited state 14.4 keV above the ground state. The nucleus decays to the ground state with the emission of a gamm ray. What's the recoil speed of the nucleus? I'm not sure how to set this up. I thought a photon would have no mass, therefor no momentum. If so I...

I was just thinking, nuclear fusion in the core of a star produces a gamma ray burst that takes about one million years to reach the surface of the star where it becomes visible light. Why does it take the gamma ray one million years to reach the surface if it is traveling at light speed? I...

Would a quark-gluon plasma reflect x rays and gamma rays and would such a plasma exist in gamma ray bursters and black holes?

What causes the short-lived, highly energetic, flash of light emitted by some black holes as they are created?

This Paper may be large, but it is a must for some pretty far reaching consequences for Cosmology. http://uk.arxiv.org/PS_cache/astro-ph/pdf/0312/0312347.pdf I will astounded if the paper is not seen in the near future as a remarkable paper of astronomical foresight and will be a paper...

It's embarassing to have to ask this, but I have never seen this issue discussed. Is there an upper limit on the energy of the gamma rays from the gamma ray bursts? Namely 1.022 MeV? Because any gamma ray of that energy or greater can and will produce pairs of electrons and positrons by...