June 25th, 2012 at 6:10PM
kaiyves: asonlynasacan: ageofdestruction: count ten: Marginalia from Apollo 15 panoramic lunar mapping mission, photographed August 1971. [ FWD | VERT | AFT | 0 0 0 0 | M RAD/SEC | APOLLO 15 | SN003 | FILM 3414 ] Image credit: NASA/JSC/ASU. Animation: Age Of Destruction. The M RAD/SEC meter intrigues me. For those who are wondering what that is, it appears to be measuring millirem per second…or radiation exposure. No worries, they’re getting very little here. I probably got more in my lifetime than these guys did.  This is awesome. I wondered: why then does it say rad instead of rem? rad stands for radians for as far as I know. So I did some research: Apperently the photographs were taken with the ITEK panoramic camera. The camera is fully automatic, among others it had a socalled V/H sensor, which stands for velocity to height sensor. When you are in a near circular orbit dividing velocity through the height could give the units radians per second. The V/H range in which the instrument could operate is 0.010 to 0.019 radians per second, which is 10 to 19 milliradians per second, this matches the dial we see in the image.  Additionally if it would be the radiation received by the astronauts, they would not be happy astronauts. The average annual dose in north america is 28 mrem.

kaiyves:

asonlynasacan:

ageofdestruction:

count ten: Marginalia from Apollo 15 panoramic lunar mapping mission, photographed August 1971.

[ FWD | VERT | AFT | 0 0 0 0 | M RAD/SEC | APOLLO 15 | SN003 | FILM 3414 ]

Image credit: NASA/JSC/ASU. Animation: Age Of Destruction.

The M RAD/SEC meter intrigues me. For those who are wondering what that is, it appears to be measuring millirem per second…or radiation exposure. No worries, they’re getting very little here. I probably got more in my lifetime than these guys did. 

This is awesome.

I wondered: why then does it say rad instead of rem? rad stands for radians for as far as I know. So I did some research:

Apperently the photographs were taken with the ITEK panoramic camera. The camera is fully automatic, among others it had a socalled V/H sensor, which stands for velocity to height sensor. When you are in a near circular orbit dividing velocity through the height could give the units radians per second. The V/H range in which the instrument could operate is 0.010 to 0.019 radians per second, which is 10 to 19 milliradians per second, this matches the dial we see in the image. 

Additionally if it would be the radiation received by the astronauts, they would not be happy astronauts. The average annual dose in north america is 28 mrem.

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  6. lightthiscandle reblogged this from asonlynasacan and added:
    Wow, I have never seen this before.
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  8. asonlynasacan reblogged this from placeofpluto and added:
    True. In my career I received well over that per year, but then again I was around…nuclear reactors. Not enough to cause...
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    I wondered: why then does it say rad instead of rem? rad stands for radians for as far as I know. So I did some...
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  13. kaiyves reblogged this from asonlynasacan and added:
    This is awesome.
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