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Questions tagged [gamma-rays]

Electromagnetic radiation with high energies and a typcial wavelength of less than 10 picometers.

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Which exact element makes Spent Nuclear Fuel dangerous?

I understand that beta and gamma emissions are what makes the decay of a radioisotope dangerous. However, U-238, which is what SNF is mostly made of, doesn't emit gamma or beta particles frequently ...
BigBox989's user avatar
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Do gamma rays not follow the Beer-Lambert law?

I was looking at an info table for radionuclides, and it said that for F-18, the 511keV gamma rays have a 1st half-value layer of 7mm, and a 2nd half-value layer of around 4mm (Edit: in lead). Why is ...
Jazzman's user avatar
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GRB 221009A Comparison with solar flare NOOA scale

I'm trying to found a comparison of the energy received on Earth by GRB 221009A in comparison of various solar flares based on NOAA Space Weather Scales (or other). I failed to find any comparison (...
Vincent ISOZ's user avatar
-3 votes
3 answers
254 views

Why can gamma rays penetrate a thick layer of lead and why can't a beta particle penetrate a thin sheet of aluminum?

This might be a stupid question, but, why is it that gamma rays are able to penetrate almost any barrier without question? We know that gamma rays are simply high frequency waves with massive amounts ...
Newton's cat's user avatar
1 vote
1 answer
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Gamma Ray Emission in the Wu Experiment

In the classic Wu experiment (https://doi.org/10.1103/PhysRev.105.1413) parity violation was discovered in the weak interaction through the asymmetry in the distribution of electrons in the beta decay ...
jkcwioqnkfdsoia's user avatar
1 vote
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Compton Scattering Angle Distribution, and the Klein-Nishina Model

I have a Geant4 simulation where 662keV photons are going into a detecting volume (Germanium). As expected, when I look at the output of the simulation, these photons undergo Compton scattering and ...
Owain G's user avatar
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If I sent a sample of U238 to the upper atmosphere

If I sent a sample of U238 to the upper atmosphere, would the solar gamma rays be sufficient enough to cause photodisintegration and the subsequent production of Np237?
Young Jun Lee's user avatar
2 votes
1 answer
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How close would a evaporating primodial black hole be to be detected? [closed]

The power output of a black holes hawking radiation is inversely proportional to the square of it's mass. According to here, in it's final second of existence, it'll emit over 2E22 joules of energy, ...
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Gamma Spectroscopy Scintillator for X-ray Fluorescence

I have been reading into X-ray and gamma spectroscopy. I have found that they can both be done with scintillation detectors and work off similar principles. That is to say that when a sample is ...
import_hill's user avatar
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Potential yields of Np-237 using a synchotron

U238 releases a neutron when it is exposed to photons of around 11 MeV, and the resulting U237 promptly decays into the fissile Np237. In such a situation, what equations can I use to relate the ...
Young Jun Lee's user avatar
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190 views

Count vs Count-per-channel

Hi there Wise people of the internet, I am trying to do analysis some data gathered from a gamma scintillator setup, its stored in root. So i have to do some coincidence measurements, and i found that ...
Carolus_Rex's user avatar
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Where are the Gamma rays in Beryllium-7 decay coming from? [closed]

Beryllium-7 decays via electron capture. This gives of Neutrino and later a Auger electron/Extreme ultraviolet photon. So where does the Gamma rays that occur 10% of time according to here come from?
blademan9999's user avatar
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Energy of an x-ray generated by cathode ray

I'm trying to understand if I could capture the event of generation of an electron positron pair from a gamma ray inside a cloud chamber. So far I've been thinking of using a cathode ray tube as a ...
Luke__'s user avatar
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How would we create a device to detect communication using the x-ray and gamma bandwidth? Like a radio. But x-ray gamma spectrum [closed]

I realize the dipole would have to be small enough (in the nucleus of an atom range) and we don't have any mechanism that is small enough to demodulate the frequencies at this rate. But is there some ...
ZiiZii's user avatar
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Is it possible to collide two neutrons? [closed]

If it is possible to collide two neutrons, how is it so? What particle accelerator or pre-collision processes are necessary and what results can be expected? If the products of neutron-neutron ...
Ayman Fayaz's user avatar
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1 answer
190 views

Why does deuterium fusing with a proton produce a gamma ray?

For the pp chain, the second process is listed as the d(p,γ) 3He reaction: D + p --> 3He + gamma ray. I cannot find an explanation why a gamma ray is created in this process. Can anyone explain why ...
Justin Pelzer's user avatar
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2 answers
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Emissions in the gamma ray frequency from gamma ray burst [closed]

Since almost all the emissions detected from gamma-ray burst are from its afterglow which are not in the gamma-ray frequency. Is the afterglow emission frequency lower than gamma-ray frequency ? I ...
Edy A.'s user avatar
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2 answers
118 views

Why can't high-level nuclear waste be disposed of by bombarding troublesome isotopes with neutrons, protons and gamma rays (photodisintegration)?

Why can't isotopes with long half-lives be radiated with free protons, neutron radiation and gamma rays (photodisintegration) in order to transmutate those isotopes into something either stable (or ...
Kurt Hikes's user avatar
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1 answer
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Do $\beta^+$ particles convert in an equal amount of $\gamma$ particles?

When $\beta ^+$ particles are stopped in alluminium they produce $\gamma$ radiation. My question is: is the amount of $\gamma$ radiation (whit alluminium infront of the counter) seen on a geiger ...
Mich Vaughan's user avatar
3 votes
1 answer
388 views

Compton absorption vs Compton scattering

I'm reading Knoll's book "Radiation Detection and Measurement", and in the chapter discussing the interactions between gamma radiation and matter, he explains about the three main types of ...
Ofek Gillon's user avatar
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MicroTeslas As Gamma Radiation Unit

I live in Poland and currently due to international situation (War in Ukraine) there is quite high risk of nuclear attack here. I also live in capital which makes it most probable target. This is why ...
Never Man's user avatar
2 votes
0 answers
70 views

Why does the intensity of the escape peak from an Am-241 gamma ray seem to change based on the element placed in front of the Am source?

I am trying to measure the value of Germanium's $K_{\alpha}$ x-ray by measuring the escape peaks produced by an Amersham $Am^{241}$ source x-ray striking a Germanium x-ray detector. The Amersham ...
Utheri Wagura's user avatar
5 votes
2 answers
939 views

Reflection of Gamma Rays

I have an experiment with a radioactive Cs$^{137}$ source which beta decays to Ba$^{137}$. Some of the barium are in an excited nuclear state which decay to the ground state and emit a $662$ keV $\...
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Does Mössbauer effect have a minimum requirement on the hardness of solid materials?

Mössbauer effect is a recoilless absorption and reemission of gamma photons in solid materials. Although atomic nuclei are very heavy, because the momentum of gamma photons is very large, the recoil ...
哲煜黄's user avatar
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What decides the penetrating power of radiation?

When I tried to find out why UV rays cannot penetrate through glass, I found this answer. But then I thought of gamma rays. Why should gamma-ray bursts or cosmic radiation, be of concern to us then? ...
Ambica Govind's user avatar
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1 answer
779 views

How does gamma radiation ionise atoms?

I am having trouble understanding how gamma radiation can ionise atoms. I think it is due to a lack of understanding about how photons work. My basic understanding is that gamma radiation doesn't ...
cabbagesss's user avatar
2 votes
2 answers
179 views

Help with debunking pseudoscience physics claim

I read this paper (PHYSIQUE MICRO-VIBRATOIRE ET FORCES INVISIBLES par A. de BELIZAL et P. A. MOREL) that claims that purely magnetic gamma rays exist. They call them negative green. They show pictures,...
user avatar
1 vote
1 answer
62 views

Hardness ratio of gamma-ray busrts

As we know there are two types of GRB (gamma-ray bursts) classes based on their time duration (t90). The presence of bimodality in histograms also verifies it. Also, I have read many papers in which ...
Akshit Dhillon's user avatar
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1 answer
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Variation of gamma line broadening with time of the source

What explains the broadening of the gamma linewidth as the source "gets old"? I have been using Iron-57 in my radiation studies but the source I obtained 6 months ago shows significant line ...
Deo's user avatar
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How do electrons escape nuclear reactors to cause Cherenkov radiation?

From what I understand, nuclear reactor cores are shielded, so that gamma rays don't get too far too often. But since electrons are expected to penetrate less material, then how are underwater nuclear ...
Eltrigs's user avatar
1 vote
1 answer
89 views

What is passive gamma ray emission?

I was trying to find the meaning of passive gamma-ray emission through the internet. I haven't found any helpful article except some research paper just denoting the word passive ray emission. They ...
Lonely walker's user avatar
0 votes
2 answers
125 views

Can gamma rays pass through Geiger-Muller counter?

Im trying to build a custom Geiger-Muller counter with an argon tube ( i’m still choosing to use wether argon 36 or 40 ) . The fact is that the counter will be made of multiple tubes which are all on ...
Alessandro Mini's user avatar
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1 answer
80 views

How is energy in terms of Intensity and Amplitude comparable to Energy in terms of Frequency?

Let's take LASER light. It has a high energy ,in terms of Amplitude, let's take a red light, of same frequency ,we are giving each of these to two atoms , now atom no $1$ is subjected to LASER light ,...
Harry Case's user avatar
0 votes
2 answers
81 views

The effect of higher and higher gamma ray energies on the atom

My knowledge in this area is very limited. Let's suppose we are cranking out more and more energetic gamma rays, as in we try to go far beyond one million electronvolts. What happens when it interacts ...
Water's user avatar
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1 vote
1 answer
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Would electricity be able to make a gamma ray?

I read that lightning creates gamma rays, but i'm not sure if it would be possible to have a capacitor that powerful to make a gamma ray. If this is possible, how efficient would such a process be?
Tyler's user avatar
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What materials can bend or reflect gamma rays?

I have heard that gold can be used as a lens for gamma rays, but what exactly could reflect them? Having this technology could make something like a Dyson sphere much more efficient, I believe.
Tyler's user avatar
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0 answers
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How does scintillation work? [duplicate]

We are doing an experiment on gamma spectroscopy and came across the concept of scintillation. It says that it's a property of materials through which we can change high energy photons (gamma photons ...
Young Kindaichi's user avatar
3 votes
1 answer
132 views

Is a gamma ray burst cylindrical (like a beam) or a cone? Could one hit both Earth and Mars at the same time?

I've always seen a GRB as a beam in various depictions. Can this beam be as wide as the distance from Earth to Mars? As in, could the beam be 400 million km in width as it travels through space? Or is ...
Water's user avatar
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Is liquid lead better gamma ray absorber than solid lead?

Is liquid lead better gamma ray absorber than solid lead? Can this be compared with the fact that an el.conductor has more resistance to current at higher temperatures? If yes could it be used in ...
Janko Bradvica's user avatar
1 vote
0 answers
17 views

Is the capacity of absorbtion of gamma rays by a material dependent on its temperature?

Is the capacity of absorbtion of gamma rays by a material dependent on its temperature? As electrons heat up a wire that wire increases its resistance to the current. Is it same regarding gamma ray ...
Krešimir Bradvica's user avatar
0 votes
4 answers
267 views

How can a gamma ray conserve its momentum while travelling from the center towards the sun's surface?

How can a gamma ray can conserve its momentum while travelling from the center towards the surface of the sun? Shouldn't it lose most of its momentum while scattering from very lite hydrogen and ...
Janko Bradvica's user avatar
0 votes
2 answers
547 views

Can we detect the alpha and beta particles using the scintillator detectors?

In the experiment gamma ray detection with scintillators, we can detect the gamma ray particle. Is it possible to detect alpha and beta particle using scintillator detectors. If not then why is so? ...
Stacy arora's user avatar
-1 votes
1 answer
28 views

Storing large quantities of potassium salts: nuclear radiation [closed]

Assuming I store $300 \;\text{kg}$ of potassium hydroxide in plastic bags on a palette in my living room. This is equivalent to $5347 \;\text{mol}$ of potassium content or roughly $0.626 \;\text{mol}$ ...
tstone-1's user avatar
0 votes
1 answer
111 views

How to produce ionizing radiation without radioactive substance?

I think ionizing radiation caused by ray or particles. My professor told me:"without radioactive substance,with only commercial products,it's possible to produce ionizing radiation." Can ...
kittygirl's user avatar
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3 votes
1 answer
88 views

Energy released when particles and anti-particles encounter

My physics teacher told me that when particles and antiparticles collide, the energy of their vanished mass plus any kinetic energy they possessed, is converted into the energy of $\gamma$ rays or ...
Lime's user avatar
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0 answers
162 views

Why aren't gamma rays more ionizing than beta and alpha rays considering the fact that it is the highest energy photon and very penetrative?

Gamma rays are photons and light waves that have more than enough energy to excite an electron and break its bond. So why aren't they more ionizing than beta and alpha particles? Is this comparison ...
PhysicsSolvesAll's user avatar
2 votes
1 answer
79 views

I thought specific activity was a property of the radionuclide?

How can specific activity of Mo-99 be higher for Mo-99 produced from fission than Mo-99 produced from neutron capture? I thought specific activity would be a property of Mo-99 so it will always be the ...
Bob Ahmed's user avatar
0 votes
1 answer
690 views

How does the channel relate to the energy of a peak in gamma spec?

In Gamma Ray Spectroscopy, what does the channel numbers for several peaks tell us about the energy of each peak? I'm not sure I quite understand the concept of the channel number. I'm sorry I cannot ...
o's1234's user avatar
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0 votes
2 answers
134 views

Can a gamma ray or x-ray cause an isotope change of a nucleus with all its electrons stripped away?

I learned that Sodium22 atoms decay to Neon 22 by ($\beta$+) (positron) emission. Also some other radioactive elements isotopes can undergo positron emission or electron absorption with a similar ...
The Transcendentian's user avatar
0 votes
1 answer
353 views

Do all radioactive isotopes and compounds exhibit photoluminesce?

I have an antique item - colored in a florescent yellow, which may be comprised of radioactive pigment like Uranium Oxide or other radionuclides I haven't a Geiger counter, but I already shined a UV ...
Isaac Dweck's user avatar

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