This is visible in the region below 100 MeV already:e.bar.goum said:However lead is Z=82, while gold is Z=79. The interaction regions are going to be very similar.
mfb said:This is visible in the region below 100 MeV already:
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z79.html
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z82.html
The K-edge shifts notably, of course, but apart from that it looks like a simple (small) scaling difference between the two elements. The photon just sees a bunch of electrons, protons and neutrons at that energy (and partons at even higher energy), I would not expect weird chemistry effects any more.
mfb said:This is visible in the region below 100 MeV already:
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z79.html
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z82.html
The K-edge shifts notably, of course, but apart from that it looks like a simple (small) scaling difference between the two elements. The photon just sees a bunch of electrons, protons and neutrons at that energy (and partons at even higher energy), I would not expect weird chemistry effects any more.
Dear e.bar.goum, many thanks for your help. Yes in fact I got the graph for lead absorptions and used this as very similar given the similar atomic number, but many thanks for getting the graph for gold as very useful to me. I am trying to see if gold nanoparticles in tumours will increase the overall number of secondary electrons using MeV photons in vivo. Many thanks again andrew visiolimfb said:This is visible in the region below 100 MeV already:
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z79.html
http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z82.html
The K-edge shifts notably, of course, but apart from that it looks like a simple (small) scaling difference between the two elements. The photon just sees a bunch of electrons, protons and neutrons at that energy (and partons at even higher energy), I would not expect weird chemistry effects any more.
An attenuation coefficient is a measure of the decrease in intensity of a wave as it travels through a medium. It is typically used in the field of physics and engineering to describe the reduction of radiation or sound wave intensity due to factors such as absorption, scattering, and divergence.
The attenuation coefficient for gold is important because it helps to determine the amount of energy that is absorbed or scattered by gold when a wave passes through it. This is useful in various applications such as medical imaging, where gold is used as a contrast agent, and in telecommunications, where gold is used in the production of high-quality connectors and cables.
The attenuation coefficient for gold can be measured using various techniques, such as spectrophotometry, X-ray fluorescence, and ultrasonic attenuation. These methods involve measuring the intensity of a wave before and after it passes through a material and calculating the difference to determine the attenuation coefficient.
The attenuation coefficient for gold can be affected by several factors, including the thickness and purity of the gold sample, the type of wave (e.g. electromagnetic, acoustic), and the frequency of the wave. External factors such as temperature, pressure, and humidity can also have an impact on the attenuation coefficient.
Yes, there are various sources where you can find graphs and charts displaying the attenuation coefficient of gold. These can include scientific journals, research papers, and online databases. It is important to ensure that the data source is reliable and the graph is relevant to your specific needs and application.