The Apollo missions marked the first event where humans traveled through the Van Allen belts, which was one of several radiation hazards known by mission planners. The astronauts had low exposure in the Van Allen belts due to the short period of time spent flying through them. The command module's inner structure was an aluminum "sandwich" consisting of a welded aluminium inner skin, a thermally bonded honeycomb core, and a thin aluminium "face sheet". The steel honeycomb core and outer face sheets were thermally bonded to the inner skin.
In fact, the astronauts' overall exposure was dominated by solar particles once outside the earth's magnetic field. The total radiation received by the astronauts varied from mission to mission but was measured to be between 0.16 and 1.14 rads (1.6 and 11.4 mGy), much less than the standard of 5 rem (50 mSv) per year set by the U.S. Atomic Energy Commission for people who work with radioactivity
The Van Allen belts and Space travel
The Apollo 11 missing tapes are missing slow-scan television (SSTV) recordings of the lunar transmissions roadcast during the Apollo 11 moonwalk, which was the first time human beings walked on the Moon. The tapes carried SSTV and telemetry data recorded onto analog data recording tape. The SSTV data was recorded as a backup against any failure of the live television broadcasts. To allow broadcast of the SSTV transmission on standard television, a real-time conversion from SSTV format was done. The converted video of the moonwalk was broadcast live around the world on July 21, 1969 (UTC). Many videotapes and kinescopes were made of this broadcast as it happened, and these have never been missing. Meanwhile, the missing tapes which carried recordings of the SSTV signal as transmitted from the Moon, but before undergoing scan conversion, are believed to have been erased and reused by NASA, along with many thousands of other tapes. (NASA was faced with a shortage of quality data tapes in the early 1980s due to a change in the manufacturing process in the mid 1970s. This caused tapes that were no longer needed to be reused.) If the original SSTV format tapes were found, modern technology could be easily and cheaply used to make a higher-quality conversion, yielding better images than those originally seen. There are several still photographs, along with a few short segments of super 8 movie film taken of a video monitor in Australia, which show the SSTV transmission before it was converted.
Apollo 11 missing tapes
Originally posted by stumason
reply to post by TeslaandLyne
I'm sorry, none of what you wrote there made any sense to me...
(I know I am running a risk here, but hey...)
Care to elaborate?
Originally posted by donniered
Oppss. There are allso oddities in the pictures what were taking. Shadow's were in the wrong place is. Oppss.