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Originally posted by Phage
What exactly do you think she is talking about? 10Mev protons? 30MeV protons? No, not hardly. She is talking about energy levels of hundreds of MeV up to GeV. She is talking about cosmic rays.
email from Dr. Eleanor Blakely
I was referring to the fact that when individual high atomic number particles fragment in shielding materials they can (depending on the material of the shielding) produce a shower of lower atomic number particles that presents a potential risk inside the shielding (depending on their atomic number and energy). Please advise if I am clear that this is a function of charged particle radiation types, not general X-ray or gamma-ray radiations. Best to you, and thanks for asking. Sincerely, Ellie Blakely
Dr Blakely reports increased frequency of cataracts among the 600-odd
astronauts studied, consistent with increased exposure to radiation
during space travel.
She does not say that aluminum shielding makes the situation worse.
She says it can increase the fluence of particles within the shielded
enclosure. Fluence is the number of particles per unit time crossing a
given area within the enclosure. Fluence says nothing about the energy
of the particles, hence nothing about their ability to cause damage.
Conservation of energy implies that when an energetic particle strikes
the outside of the shield causing a cascade of particles inside, the
total energy of all the inside particles must be less than the energy
of the single outside particle. The outside particle has to overcome
the energy binding the internal particles to the aluminum in the first
place.
Look at it this way. Suppose you are inside an enclosure. A bullet
strikes the outside and sets off a cascade of ping-pong balls on the
inside. Which would you rather have hit you, the bullet, or the ping-
pong balls?
Another ignorant misreading.
Originally posted by FoosM
Great, you just contradicted your earlier statement that mirrors must have been placed by people.
You have just revealed that you can do it with machines too. Thanks
So guess what? You know what "real simple" is? Americans sent robots too, is that hard to grasp?
Now combine that with your dirty mirrors reveal, and you might start seeing a pattern of deception.
When did those scientist begin getting clean signals back from the mirrors?
As a matter of fact, how can you really get a clean signal from a device no larger than a laptop over 200.000 thousand miles away while both it and you on this planet are moving?
Great, you just gave a possible explanation for the higher doses on the other Apollo missions which are all within exposures for LEO. But other than that, you cant provide any evidence of correlation.
Originally posted by Pinke
Why not ask her the question in context PPK?
This was posted earlier in the thread, but it seems you missed it. Appears to explain some of the confusion you have regarding the shielding.
Dr Blakely reports increased frequency of cataracts among the 600-odd
astronauts studied, consistent with increased exposure to radiation
during space travel.
She does not say that aluminum shielding makes the situation worse.
She says it can increase the fluence of particles within the shielded
enclosure. Fluence is the number of particles per unit time crossing a
given area within the enclosure. Fluence says nothing about the energy
of the particles, hence nothing about their ability to cause damage.
Conservation of energy implies that when an energetic particle strikes
the outside of the shield causing a cascade of particles inside, the
total energy of all the inside particles must be less than the energy
of the single outside particle. The outside particle has to overcome
the energy binding the internal particles to the aluminum in the first
place.
Look at it this way. Suppose you are inside an enclosure. A bullet
strikes the outside and sets off a cascade of ping-pong balls on the
inside. Which would you rather have hit you, the bullet, or the ping-
pong balls?
Another ignorant misreading.
I'd suggest asking the Doctor in context for the question. Otherwise all we're doing is quote mining her for specific answers. Really you would want to ask if the shielding was appropriate and the results expected.
my email to Dr. Blakely
Dear Dr. Blakely,
Thank you so much for your reply. I didn't really expect one as I know how busy you would be. I've read your CV. So I am extremely grateful to put it mildly to receive a reply from such a prominent and respected individual.
Also, I should point out I am not a Doctor, rather a very interested amateur researcher in this area.
The reason I was asking is because of a dispute going on in a forum trying to answer whether aluminum shielding would be adequate to protect astronauts in space.
Below is what's being suggested. I wonder if at some point in the next month or so if you happen to get a couple of minutes free you might be able to address.
>>>>>
"Dr Blakely reports increased frequency of cataracts among the 600-odd
astronauts studied, consistent with increased exposure to radiation
during space travel.
She does not say that aluminum shielding makes the situation worse.
She says it can increase the fluence of particles within the shielded
enclosure. Fluence is the number of particles per unit time crossing a
given area within the enclosure. Fluence says nothing about the energy
of the particles, hence nothing about their ability to cause damage.
Conservation of energy implies that when an energetic particle strikes
the outside of the shield causing a cascade of particles inside, the
total energy of all the inside particles must be less than the energy
of the single outside particle. The outside particle has to overcome
the energy binding the internal particles to the aluminum in the first
place.
Look at it this way. Suppose you are inside an enclosure. A bullet
strikes the outside and sets off a cascade of ping-pong balls on the
inside. Which would you rather have hit you, the bullet, or the ping-
pong balls?
Another ignorant misreading."
Originally posted by andre18
I'm not a buff on this stuff but ill ask this, which i think might help - to your knowledge where there any missions that went to the moon during the 1969-72 manned moon missions that NASA could have used to send the probes with mirrors to the moon? If your answer is no, then frankly the only way those mirrors could have gotten there is by the maned missions to the moon.
The National Science Foundation (NSF) last week wrote to scientists working at the McDonald Laser ranging station at Fort Davis in Texas to tell them the annual $125,000 funding for their research project was going be terminated following a review of its scientific merits.
The decision means that four decades of continuous lunar laser research at the McDonald Observatory, run by the University of Texas at Austin, will be halted by the end of this year. Among the project's unlikely achievements has been the discovery that the moon is moving away from Earth at a rate of two-and-a-half inches a year.
The mirror's existence, and the fact that astronomers can bounce lasers off it and detect the returning beam, has also provided Nasa and other scientists with compelling evidence to refute the claims of moon-landing deniers who claim the Apollo lunar mission were hoaxes filmed in an Earth-based studio.
The mirror left by Aldrin and Armstrong after they landed on the Sea of Tranquillity on 21 July 1969, was one of five known as "corner mirrors" or "retro-reflector arrays" that were taken to the moon in the later Sixties and early Seventies. Two other corner mirrors were brought to the moon by astronauts on later manned lunar flights, on the Apollo 14 and the Apollo 15 missions. In addition, a second pair were built by French scientists and flown to the moon by the Soviet Union on their robot Luna probes.
For the first lunar landing, Mare Tranquilitatis was the site chosen because it is a relatively smooth and level area. It does, however, have a high density of craters and in the last seconds before landing, the LM had to be manually piloted by Neil Armstrong to avoid a sharp-rimmed ray crater measuring some 180 meters across and 30 meters deep known as West. The LM landed safely some 6 km from the originally intended landing site.
The landing site is 41.5 km north-northeast of the western promontory of the Kant Plateau, which is the nearest highland region. The Surveyor 5 spacecraft is approximately 25 km north-northwest of the Apollo 11 landing site, and the impact crater formed by Ranger 8 is 69 km northeast of the landing site.
Surveyor 5
Launched 08 September 1967
Landed 11 September 1967, 00:46:44 UT
Latitude 1.41 N, Longitude 23.18 E - Mare Tranquillitatus (Sea of Tranquility)
The impossible locating of the little reflectors
The reflectors are said to have been set up "on the moon" to measure better the distance between Earth and moon. But the reflectors are not more than good "rear reflectors". And when there would really set up these little reflectors on the moon so it would not be possible to locate them, because on a distance of 380,000 km a laser beam is 7 km large, and after the reflexion on the moon surface the laser beam is 20 km large.
First the distance between moon and Earth has not been determined until now as a stable distance. Every institution which is busy with this subject indicates other numbers. This is because the moon is moving and has no stable connection to the Earth.
Secondly I mean that the laser mirror of e.g. Apollo 11 is (comparing fotos) not adjusted to the Earth.
Thirdly there is no laser mirror needed to measure the distance with a laser. The normal bright reflecting lunar surface is absolutely enough
It would be logic to think that the laser reflectors could be found where the "moon astronauts" would have set them up during the "moon landings" (Wisnewski, p.221). An investigation of space flight historian Michael Stenneken has given an other result. He wanted to buy land "on the moon" near a "moon landing" place and wanted to have the precise coordinates. But he found out that there are no standardized coordinates of the "moon landings":
The reflectors are too small to be seen from Earth, so even
when the beam is precisely aligned in the telescope, actually
hitting a lunar retroreflector array is technically challenging.
At the moon's surface the beam is roughly four miles wide.
Scientists liken the task of aiming the beam to using a rifle to
hit a moving dime two miles away.
Once the laser beam hits a reflector, scientists at the ranging
observatories use extremely sensitive filtering and amplification
equipment to detect the return signal, which is far too weak to be
seen with the human eye. Even under good atmospheric viewing
conditions, only one photon--the fundamental particle of light--will
be received every few seconds.
Dude with the spending of billions i'm sure they found a way.
Yeah they found a way to fake it real good.
This is NO conspiracy theory, stupid Wikipedia, but these are facts. You don't believe? The facts remain.
[But the problem of an impossible radio communication over a distance of 380,000 km and of an impossible landing of the Luna probes by an impossible radio communication is never mentioned...]
Originally posted by Retseh
Amazing that all this silliness has always ignored the human element. The thousands of engineers, scientists, and of course astronauts who would all have to be in on the lie, since it would be impossible to hide it from those people.
Funding was not the only critical component for Project Apollo. To realize the goal of Apollo under the strict time constraints mandated by the president, personnel had to be mobilized. This took two forms. First, by 1966 the agency's civil service rolls had grown to 36,000 people from the 10,000 employed at NASA in 1960. Additionally, NASA's leaders made an early decision that they would have to rely upon outside researchers and technicians to complete Apollo, and contractor employees working on the program increased by a factor of 10, from 36,500 in 1960 to 376,700 in 1965. Private industry, research institutions, and universities, therefore, provided the majority of personnel working on Apollo.
Thats right, it means that one company is only going to share 'need to know' information to another...
IN this lively and engaging book, Mike Gray views the Apollo program through the prism of the aerospace industry. Harrison Storms, the protagonist, was president of the aerospace division of North American Aviation, which developed the Apollo command module and the second stage of the Saturn launch vehicle. For six years he oversaw a string of remarkable successes, from winning the Apollo contract in the first place to pioneering the successful development of a rocket fueled by liquid hydrogen.
Then came the fire. On Jan. 27, 1967, the astronauts Roger Chaffee, Gus Grissom and Ed White were killed by a flash fire in the command module of their Apollo 1 spacecraft during a preflight test on the ground at Cape Kennedy.
Once the laser beam hits a reflector, scientists at the ranging
observatories use extremely sensitive filtering and amplification
equipment to detect the return signal, which is far too weak to be
seen with the human eye. Even under good atmospheric viewing
conditions, only one photon--the fundamental particle of light--will
be received every few seconds.
So what was the point of the reflectors?
Yeah they found a way to fake it real good.
God Apollo is so easy to rip apart.