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Originally posted by Soylent Green Is People
reply to post by Observer99
It's NOT only the margin of error.
It's also the fact that there seems to be no agreed-upon value for the ratios of this isotope that should be found in naturally-occurring Earth-found Magnesium. Sure -- all of these values only vary slightly -- but so did the ratios value of the sample in question.
here are two sources with slightly varied values (which also vary from the values in the OP):
Berkeley Laboratory Isotope Project
Oak Ridge National Laboratory
In the second paragraph of this pdf file, there are two more ratios that vary from the ones I listed and from each other:
Absolute Isotopic Abundance Ratios and Atomic
Weight of Magnesium (Note: links directly to a pdf file)
This article states that the ratio may vary slightly from sample to sample, depending on the terrestrial source of that sample (i.e., where it is from):
ku-dk.academia.edu...
and another article about how the ratios found in natural Mg may slightly vary:
adsabs.harvard.edu...
Here is yet ANOTHER article from the National Standards that says the measured ratios of Mg isotopes may slightly vary:
pubs.rsc.org...
The bottom line is that the aluminum sample in question from the OP's article ACTUALLY IS consistent with some measured values of the isotopic ratios of naturally-occurring Mg, just not the values used by that particular lab (and even that was consistent, within the margin of error).
The fact that the measured isotopic ratio of magnesium is KNOWN to vary enough to be consistent with the sample in question was seemingly ignored by the article in the OP.
edit on 7/14/2011 by Soylent Green Is People because: (no reason given)
Originally posted by SkepticOverlord
Originally posted by JohnnyCanuck
Aluminum as such is not found in a raw form, so a sample is going to display some manufacturing properties. Methods such as ion-exchange chromatography will show such properties. If aluminum is not made that way, it begs the question "Where is it from?"
Oh well... then it must be from outer space!
Really...on a supposed UFO crash site, the OP's assertion is not that way out of line.
Sure it is, and it's a disgrace to the notion of UFO research to suggest that a small piece of a (known) version of aluminum, in the desert, decades after the reported crash could be extraterrestrial in origin.
It could be bits from an aluminum cookware set designed for camping, left in the fire too long decades ago.
Originally posted by Observer99
The truth is that the metal could stand up and scream "I AM NOT FROM EARTH!!" and the same people would be inventing theories about what movie props company could have made it and how it somehow proves the opposite of what it says. The debunkers in this thread didn't even address the line graph on page 1. Either the graph is fraudulent and you somehow missed it, or it shows something out of the ordinary.
Originally posted by SkepticOverlord
Seems overly sensationalist. A small piece of aluminum, found in the desert, displaying minor attributes which are atypical of normal aluminum, so it must be "not from earth?"
Sure.
I suppose the probability that it's debris from some unknown campsite left behind in the past 40 years is out of the question... right?
Originally posted by Ross 54
We've been hearing some talk that the metallic composition of the Roswell metal fragments is similar to that of an alloy used in construction work. I looked into this. The major constituent of the metal, after aluminum, is silicon, averaging out at about 1.88%, by weight. It is reported that Aluminum-Silicon alloys with a low percentage of silicon are used exclusively as welding filler alloy, in rod form. These are typically very simple alloys of about 95 % aluminum and 5% silicon. Even if we grant the use of a lower percentage of silicon, on the order of 2%, we have to wonder about the unexpectedly low percentage of aluminum, ~ 79%. One wonders about the logic of making a complex mix of alloys for a basic thing like welding rod, so as to displace nearly 20 % of the aluminum, when the standard, simple alloy, AA4043, is so serviceable. This begins to look less and less like domestic metallurgy, and more and more like something truly exotic. Anyone with welding experience, who has some knowledge bearing on this matter is urged to reply. Ross
Originally posted by Ross 54
We've been hearing some talk that the metallic composition of the Roswell metal fragments is similar to that of an alloy used in construction work. I looked into this. The major constituent of the metal, after aluminum, is silicon, averaging out at about 1.88%, by weight. It is reported that Aluminum-Silicon alloys with a low percentage of silicon are used exclusively as welding filler alloy, in rod form. These are typically very simple alloys of about 95 % aluminum and 5% silicon. Even if we grant the use of a lower percentage of silicon, on the order of 2%, we have to wonder about the unexpectedly low percentage of aluminum, ~ 79%. One wonders about the logic of making a complex mix of alloys for a basic thing like welding rod, so as to displace nearly 20 % of the aluminum, when the standard, simple alloy, AA4043, is so serviceable. This begins to look less and less like domestic metallurgy, and more and more like something truly exotic. Anyone with welding experience, who has some knowledge bearing on this matter is urged to reply. Ross
The Aluminum Alloy Temper and Designation System - In North America, The Aluminum Association Inc. is responsible for the allocation and registration of aluminum alloys. Currently there are over 400 wrought aluminum and wrought aluminum alloys and over 200 aluminum alloys in the form of castings and ingots registered with the Aluminum Association.
Originally posted by liejunkie01
You are taking the average. Not the individual sample specimen....If I am looking at the chart correctly, the samples are all over the place in compostion of alloying elements. Does this mean that the fragments are from several different places on whatever the pieces belonged to?.....I mean lets face it. He could have picked up the fraction of aluminum that was welded. Like a fragment of two adjoining pieces(a joint if you would). It is pretty small. It could be any part or piece of anything....