Questions tagged [gamma-rays]

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

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How close would a supernova be to endanger the astronauts on the ISS?

How close would a supernova be to endanger the astronauts on the ISS? Would Betelgeuse be close enough?
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Can gamma rays be blocked or redirected by magnetic or electromagnetic fields?

I've been interested in fusion research for a while now and found that reactions such as the proton-proton cycle produce a lot of gamma rays which require large quantities of water or lead to shield ...
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Metal, X-Ray, Gamma-ray

As I know, all metals absorb x-ray and gamma radiation. Also, as I know, all rays are converted into any energy. In this case, I mean warmth. For example, an x-ray is absorbed by metal, then metal ...
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How do you experimentally determine the value of the Compton edge from data?

A NaI scintillation detector was used to acquire the following data. In order to calibrate the detector, I fitted a Gaussian function to the photopeak. I now want to check that my measured value for ...
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Understanding the effect of Compton scattering in Gamma ray spectroscopy

The following calibrated gamma ray spectrum was taken using data for a Cs-137 source acquired using an NaI scintillation detector. The predicted value of the Compton edge was calculated using the ...
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What are the more important effects or consequences of gamma-ray bursts for the cosmos?

I would like to know what are, in general, the consequences/effects of the known gamma-ray bursts. I refer gamma-ray bursts from the Wikipedia Gamma-ray burst that shows how are classified and the ...
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On the uncertainty principle when a gamma-ray burst is passing close enough of the magnetic bubbles placed at the edge of a planetary system

I'm going to ask a related question to my past post Collision or impact of a gamma-ray burst against the magnetic bubbles at Solar System's edge on this site Physics Stack Exchange. I have no a good ...
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Gamma-ray burst velocity

Is it possible for an impactor wave in an expanding gamma-ray burst jet to accelerate from subluminal to superluminal velocities, or decelerate from superluminal to subluminal velocities? If so, how?
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How should I treat background radiation in an experiment?

I am performing an experiment to verify the inverse-square law for the intensity of a beam of $\gamma$ rays emitted by a sample of $^{60}\text{Co}$. The set-up is as follows: A Geiger-Müller tube ...
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Collision or impact of a gamma-ray burst against the magnetic bubbles at Solar System's edge

I'm going to ask* about what should be the effect/interaction, if any, when a gamma-ray burst crashes or hits against the magnetic bubbles at Solar System's edge. These magnetic bubbles are explained ...
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Backscattering of gamma rays due to lead

I am conducting an investigation of backscattering in gamma ray spectroscopy. A backscattering factor $F_b$ is defined as: $$ F_b = \frac{N_b}{N_i}\times 100\% $$ where $N_b =$ Number of photons ...
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Why bulk of HPGe detectors is doped?

When I am looking at schematic diagrams of HPGe gamma spectrometer detectors (like this Ortec GLP one), it is often mentioned that bulk of Ge is doped. In this example - P-type doped. Is there a ...
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Simulate Background Gamma Radiation for Localization [closed]

I'm working on a gamma radiation source localization project. The gamma radiation measurement model is: $\lambda_k = \frac{I}{(x_s - x_k)^2 + (y_s - x_y)^2} +\lambda_b$. Where $\lambda_k$ is the $...
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How can I create gamma rays with energy >2MeV?

I have been exploring pair production (electron/positron) using gamma, and with a Cobalt-60 source this is easy enough. That's just the problem, though. I'm looking for a challenge. I want a stream ...
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Is the gamma radiation width equal to total level width in a nuclear reaction?

Consider a nuclear reaction in which an indium nucleus is bombarded by neutrons. The question I am dealing with asks to find the relative probabilities of (n,n) and (n,$\gamma$). The total level width ...
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EM waves with frequency much higher than gamma rays penetrate a planet like Earth?

I have just started to study the electromagnetic waves as a personal interest. I wonder if there exist a much higher frequency of electromagnetic wave than Gamma Ray's which can even penetrate Earth. ...
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Calculating expected gamma attenuation without a specific energy level

I am trying to calculate 2 things for a science experiment involving radiation and shielding using a geiger counter. A) whether the reduction in counts per minute through a measured thickness of ...
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What is the lowest energy gamma ray?

If we use the "origin-based" definition of gamma rays (i.e. photons emitted from nuclear decay, regardless of wavelength), which decay produces the lowest-energy, longest-wavelength emission? This ...
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How is this dose rate equation derived?

I've been trying to determine how the following equation for dose rate from a gamma point source has been derived, I've seen it in numerous books with no clear explanation for its derivation, ...
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Is there a difference in wavelength emission spectra of ZnS:Ag when its irradiated with protons vs. gammas?

How would I measure this, because I couldn't find this information in literature as of yet? I have neutron (to produce protons by recoil) and gamma sources, but I don't have a pure neutron source, and ...
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Would SiPMs respond differently to scintillation light from neutrons vs. gammas?

I have a fast-neutron scintillator which also is sensitive to gammas (much less so, though). When I connect it to a SiPM instead of a PMT, the gamma pulses (obtained from performing pulse shape ...
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Step-like contribution to background $\gamma$ ray peaks

I'm reading the paper "Analytical functions for fitting peaks from Ge semiconductor detectors" by R.G. Helmer and M.A. Lee. For $\gamma$ ray peaks the spectral "background" in the region of a peak: ...
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Is there a mathematical model for predicting when gamma rays are produced in radioactive decay?

My understanding of gamma ray emission from radioactivity is that the daughter particle is in an excited state, which then produces a gamma ray as the electron drops energy levels. In the case of ...
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High-purity silicon detector vs HPGe for gamma-spectroscopy

Is it possible to construct a high-purity silicon detector for gamma spectroscopy the same way HPGe detectors are made? Will it work when cooled to the same 77 K? Why HPGe is mainly used for gamma ...
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Is there any published ratio between the photo peak and the compton continuum as seen on NaI(Tl) 3“x3” at 1460 keV?

As I know from Gamma spectroscopy, there should be a photo peak from a given element that emits a gamma ray, with the possibility of single/double escape, back scatter peak if the energy surpasses the ...
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How do we recover fusion energy from gamma photons

Most fusion reactions create energy in form of hard gamma radiations. A single gamma photon carries energy orders of magnitude higher than any ionization level. Even if we develop some hardcore ...
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X-rays / Gamma rays “oven” vs microwave oven

Let's imagine a seller scammed you and sold you a Gamma rays / X-rays "oven" instead of a common microwave oven. The power consumption would be the same as a common microwave oven, i.e. about 1 kW, ...
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Neutron capture gamma energy

I have the atom 113Cd which captures a neutron and becomes 114Cd. This 114Cd goes from being exited to its base by emitting gamma rays. How can I calculate the Energy of those gamma rays? I can ignore ...
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Which are the highest energy gamma-rays produced by humans?

We can produce energetic gamma-rays on Earth in nuclear reactions but also among the decay products of LHC particle collisions. So I was wandering which are exactly the highest energy man-made gamma-...
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In an anti-matter universe, would an anti-matter black hole emit anti-matter gamma radiation? [duplicate]

In an anti-matter universe, when an anti-matter black hole is consuming a large anti-matter star, would it emit anti-matter gamma radiation, or would gamma radiation be the same in either a matter or ...
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What happens after barium sulphate absorbs gamma rays?

BaSO4 will happily absorb gamma-rays, presumably bumping electrons up into outer orbitals. What happens next? I assume fluoresence as electrons drop back. Will the BaSO4 be safe to handle immediately ...
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Half thickness of lead using a Ba-133m source, references?

I carried out an experiment to calculate the half thickness (half value layer) of lead. The experiment was done using what i believe to be a Ba-133m source on this software: https://radiation-lab....
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Why Li is not added as contact by ion implantation method in p type HPGe detector? [duplicate]

n+ contact of p type Ge is ~700µm thick compared to p+ contact of n type Ge only ~0.3µm. The process of adding the contact is different. n+ contact Li is added by diffusion process but p+ contact B is ...
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Has there been any R&D(let alone progress) in the development of gamma voltaic cells?

I ask this because it is my understanding that gamma rays form ion tracks and oxygen radicals when gamma emitting material is immersed in an aqueous solution. Cesium-137 is a very strong gamma ray ...
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Gamma spectrometry: effect on one peak when adding another source

Suppose I have a sample containing only 137Cs. Now assume it shows 1000 cps counts for 137Cs, 662keV energy. Now I added 60Co (1173, 1332 keV) source in the same sample. Compton scattering ...
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Questions regarding germanium detector

Why n+ contact in n type Ge is not several hundred microns? . Why we require both additional p or n type contact? in p type Ge, why we require additional p type junction also? crystal itself should ...
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Why n+ contact of p type Ge is 700um thick compared to p+ contact of n type Ge only 0.3um?

Whether the reason is as follows? Predominantly HPGe is p type. So compensation of large p type impurity requires more n+ contact. (700um) But n type Ge is made by doping of excess addition of n type ...
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Dark Matter gamma-ray flux from hadronic annihilation channels?

For a project I am currently reading into indirect detection of Dark Matter via gamma-rays from DM subhalo's. I understand that there is a possibility of DM annihilating with each other in these ...
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Higher frequency waves

Can we artificially create extremely high frequency waves in the ( order of 10^60 )? how hard is it to create high frequency waves, and what limits are potential in doing so...
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Nuclear reaction – What is the asterisk an indication of?

I've been observing the two-step decay of iodine-131 and can't quite determine what the asterisk above Xenon-131 indicates. I'm currently unsure as to what precisely the superscript asterisk on Xenon ...
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Why would gamma spectroscopy be a tool for nuclei?

I am very much familiar with Atomic spectroscopy, not much with nuclear spectroscopy. In atoms (electronic cloud), we have electromagnetic interaction that plays the leading role, whose exchange ...
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Absolute measure of activity

I am generally quite stuck and not sure what the absolute measure of activity is, and relating to my data is more confusing. So I am trying to calculate the absolute measure of activity of a caesium ...
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List of Gamma Ray Spectrum Values

I am trying to identify the peak which is occurring in my caesium 137 spectroscopy graph, and trying to find a creditable source with a list of most if not all gamma decay spectrum values for all ...
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In HPGe detector how electron-hole pair remembers energy information of incident gamma?

In the HPGe detector, any gamma energy (> e-h pair production E) shall excite the electron of the valence band and send it to the conduction band. Due to reverse bias, the conduction band e shall be ...
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How in Cesium 137 spectroscopy Barium X-rays being detected?

Iv been looking at gamma ray spectroscopy of late for a project that I am currently researching and going to be doing in the lab, but what I cannot seem to figure is how the barium x-rays are being ...
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Gamma ray spectroscopy lab experiment : Cobolt 60 Data

I am currently carrying out an a gamma ray spectroscopy experiment. At this moment in time I am trying to decipher what parts of the gamma spectrum are what, i.e Compton edge, backscatter, photo peaks ...
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Probability of Photoelectric Interactions

I have am currently reading Radiation Detection and Measurement, by Gleen F.Knoll, and in chapter 2 page 49, he talks about the probability of the photoelectric interaction as: $$\tau \approx C \frac{...
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Gamma Ray Spectroscopy-What Happens With Inside the Scintillation Crystal

I am going to carrying out an investigation in the lab on gamma ray spectroscopy and to help me understand the graphs that will be displayed to me, I am researching on the types of interactions that ...
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What would happen if gamma-ray burst from a supernova burst hit the sun? [closed]

What would happen if gamma-ray burst from a supernova burst hit the sun? Would the sun explode? Would the sun expand. Have a longer lifetime? Shorter Lifetime? Because people are nit-picky about stuff ...
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Wavelength and penetration by EM radiation

I'd like you to clarify the relationship which relates penetration power by EM radiation with its wavelength (or inverse of frequency). Suppose we conduct an experiment, irradiating a body with ...

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