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Natural Science Forum / Physics / Optics / December 2004Discovery of UV from XRF sources
For the first time ever, UV dominated optical spectrum was detected from solid X-ray fluorescent (XRF) sources present as salts (AMC 2084,UK). http://www.geocities.com/raomap/discovery1.html Critical analysis of data revealed that it is UV dominant Energy Dependent Atomic spectrum http://www.geocities.com/raomap/edas.html M.A.Padmanabha Rao Former Professor If I understand what he is saying, there isn't much new here. An easy way to get soft characteristic x-rays is to shine an alpha particle emitter such as curium or americium on a a metal or compound. For example if you want characteristic x-rays of fluourine you would use a lithium flouride crystal. So you have these 5 MEV alpha particles slamming into the target hoping to get a few 500 eV characteristic x-rays, and actually it works quite well. Is it surprising that along with all the other chaos going on as these 5 MEV alpha partcles are slamming through the solid that other processes are creating a tiny bit of visible and UV as well? And some of the crystals are bound to have some optical fluorscence of their own, though the metals wouldn't. Best regards mark > For the first time ever, UV dominated optical spectrum was detected > from solid X-ray fluorescent (XRF) sources present as salts (AMC [quoted text clipped - 6 lines] > M.A.Padmanabha Rao > Former Professor  Signature---------------------------------------------------------------------- Mark W. Lund, PhD ** Battery Chargers CEO ** Bulk Cells and Custom Battery Packs PowerStream Technology ** Custom Power Supplies 140 S. Mountainway Drive ** DC/DC Converters Orem Utah 84058 ** Custom UPS http://www.PowerStream.com ** Engineering, manufacturing, consulting > If I understand what he is saying, there isn't much new here. > An easy way to get soft characteristic x-rays is to shine an [quoted text clipped - 25 lines] >> M.A.Padmanabha Rao >> Former Professor I also had trouble understanding the big deal about the post. Why would one not expect ultraviolet radiation from atoms excited by soft x-rays? You hit the atom with a high energy photon to excite it and it should ring with a cascade of transitions to lower energy levels. Somewhere along the line the emitted photons will be in the uv and finally in the visible and infrared. It would be good to understand what is being said without obfuscation of mathematical notation. That is--what is the physics being described? Bill My work is not on excitation of atoms by X-rays. My research is on emission of UV dominant optical spectrum newly found from the same excited atoms that emit X-rays in XRF sources. Please go through the website for further clarification. http://www.geocities.com/raomap/discovery1.html M.A.Padmanabha Rao Former Professor > My work is not on excitation of atoms by X-rays. > [quoted text clipped - 4 lines] > M.A.Padmanabha Rao > Former Professor This sounds like a distinction without a difference. If an atom emits an x-ray photon because of a radioactive decay, I would expect the excited atom will give off energy as a series of photons as it returns to its ground state. The distinction is just in how the first excitation occurs. It is like saying there is a difference between an x-ray photon and a gamma ray photon of the same energy. What am I missing, if anything. Bill You are true in saying "I would expect the excited atom will give off energy as a series of photons as it returns to its ground state". Prior to my work, an excited atom in XRF source is known to emit X-rays causing Auger electron emission. If X-ray has to emit any other energies it does happen only by a phenomenon. I have explained a new atomic phenomenon causing UV dominant spectrum from XRF sources. Just glance at : http://www.geocities.com/raomap/discovery6.html I presented this work twice in US, once n Bulgaria and four times in India. M.A.Padmanabha Rao Former Professor > You are true in saying "I would expect the excited atom will give off > energy as a series of photons as it returns to its ground [quoted text clipped - 9 lines] > M.A.Padmanabha Rao > Former Professor To put it nicely, I did look at your site. Unfortunately, reading it makes my eyelids heavy and the rest of me drowsy. I find it difficult to believe that the "phenomenon" you describe requires detailed understanding of your mathematics to be understood. Please describe to me, if you can, using words alone, what your phenomenon is in terms of photons, atoms, and electrons. If what you describe truly appears to be worth it, it will give me the motivation to plod through the mathematics using wave functions, matrix elements, etc. Bill Thanks for your response. Within excited atom of XRF sources and radioisotopes, beta, gamma or X-ray can interact with core-electron Coulomb field and generate 'new electromagnetic radiation' with energy in eV level. In turn, it excites valence electron and causes UV dominant atomic spectrum. Significantly, the nature of optical spectrum gauzed from the measurements of UV, visible (VIS) and near infrared (NIR) intensities rely on energy of ionizing radiation that the source emits. The 'UV dominant energy dependent atomic spectrum' differs from the standard atomic spectrum known so far. UV dominance is evident up to 14 MeV of ionizing radiation, afterwards Visible (VIS) and near infrared (NIR) radiations dominate the spectrum. Most importantly, this interaction reveals that beta, gamma or X-ray of same energy exhibit same performance. This insight does not support particle nature of electron while strongly suggests its wave nature. This particular insight can be well explained in terms of waves. Please let me know, whether you require more details. M.A.Padmanabha Rao Former Professor My posting is not on production of characteristic X-rays. My subatomic research mentioned here is on newly found emission that is UV dominant optical spectrum caused by X-rays within the same excited parent atom of XRF sources. Please go through the website for further clarification: http://www.geocities.com/raomap/discovery1.html M.A.Padmanabha Rao Former Professor By exciting the soft x-rays using 5 MEV alpha particles you are disturbing both the inner and outer electron shells, so you are really proving that high energy alpha particles are exciting the UV. Since alpha particles are just helium nuclei, you can probably expect that as they stop and then capture electrons you will also get UV. > My posting is not on production of characteristic X-rays. > [quoted text clipped - 4 lines] > M.A.Padmanabha Rao > Former Professor Signature---------------------------------------------------------------------- Mark W. Lund, PhD ** Battery Chargers CEO ** Bulk Cells and Custom Battery Packs PowerStream Technology ** Custom Power Supplies 140 S. Mountainway Drive ** DC/DC Converters Orem Utah 84058 ** Custom UPS http://www.PowerStream.com ** Engineering, manufacturing, consulting My study does not involve any excitation externally by alpha particles. My research reveals that radioisotopes and XRF sources emit optical spectrum along with ionizing radiations from the same parent excited atom. I have also tested 241Am, but the study revealed its Np L X-rays have caused the optical spectrum. Radioisotopes which are predominantly alpha emitters also may emit optical spectrum , but at 5 MeV energy, UV intensity can be relatively low than that caused by soft beta, gamma radiations. I appreciate if you please refer the following website, and make further comments, if any http://www.geocities.com/raomap/discovery6.html M.A.Padmanabha Rao Former Professor You are using the term "XRF" sources. XRF means x-ray fluorescence, which means x-rays are used to excite x-rays. Americium 241 decays with a 5.4 MEV alpha particle. The x-ray sources that use Americium use this 5.4 MEV alpha particle because it is efficient at creating soft x-rays. Trying to use gamma rays to do the same is extremely inefficient, since the absorption is low. Maybe you don't understand how the XRF source in your experiments works? best regards mark > My study does not involve any excitation externally by alpha particles. > [quoted text clipped - 11 lines] > M.A.Padmanabha Rao > Former Professor Signature---------------------------------------------------------------------- Mark W. Lund, PhD ** Battery Chargers CEO ** Bulk Cells and Custom Battery Packs PowerStream Technology ** Custom Power Supplies 140 S. Mountainway Drive ** DC/DC Converters Orem Utah 84058 ** Custom UPS http://www.PowerStream.com ** Engineering, manufacturing, consulting > You are using the term "XRF" sources. XRF means x-ray fluorescence, > which means x-rays are used to excite x-rays. Americium 241 decays > with a 5.4 MEV alpha particle. The x-ray sources that use Americium > use this 5.4 MEV alpha particle because it is efficient at creating > soft x-rays. Trying to use gamma rays to do the same is extremely > inefficient, since the absorption is low. I give up. Bill First of all the aspect you point out is not of much relevance to my research. AMC 2084 utilizes the soft 59.54 KeV gamma to cause Rb, Ba, Tb, Co, Mo, and Ag X-rays, to have a better cross section. If not correct, please enlighten me citing a reference. Most importantly, my research shows X-ray, gamma or beta can cause UV dominant optical spectrum from the same excited parent atoms of XRF sources and radioisotopes. Please go through the websites. I appreciate if you can comment on the actual work. http://www.geocities.com/raomap/discovery1.html http://www.geocities.com/raomap/discovery6.html M.A.Padmanabha Rao Former Professor |
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