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Extrapolation of the Orion EFT radiation data.
August 13, 2018
5:44 pm
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Nunya Bidness
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The Orion EFT launched on  EFT-1 on December 5, 2014 between 12:07 UTC and 16:30 UTC (4 hours, 27 minutes). 

The Orion's radiation detectors recorded 17.9 mGy on the right detector and
15.7 mGy/ on the left dector which is an average of 16.8 mGy for a 267 minute mission of which only 2 hrs and 17 minurtes where actually in the Vann allen belt.

If we use the mission time of 267 minutes then the hourly dose rate is
16.8 mGy/267 min = .0629 mGy/minute
Now if we assume that the ever slowing Apollo 11 took 240 minutes to transit the 3700 miles of the Van Allen Belt then we see that .0629 mGy/min * 240 min * 2(two trips) = 30.202 mGy

Extrapolating out to the 8.33 days of the Apollo mission it can be seen that
30.202 mGy/8.33 days = 3.63 mGy/day mission dose.

If the Orion had traveled the same route as the Apollo to the moon the Van Allen belt would add
3.63 mGy/day to the mission exposure rate. No Apollo mission has anywhere near this amount and this amount does not include GCR or lunar orbit and lunar surface components of the total radiation exposure.

You can see that no Apollo mission ever left LEO.

August 14, 2018
11:39 pm
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Nunya Bidness
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ISS ionizing radiation dose measurements, made within the habitable volume with thermoluminescent dosimeters and crew personal dosimeters, range from 5 to 12 μ Gy (0.5 to 1.2 milli rads) per hour, depending on location in the habitable volume, corresponding to an annual dose range of 44 to 105 milli Gy (4.4 to 10.5 rads).

5 to 12 μ Gy (0.5 to 1.2 milli rads) per hour = .120 to .288 mgy/day.  Apollo 11 received .22 mgy/day

The casual observer can see the mission dose of Apollo 11 is practically the same as the ISS which orbits in low earth orbit at 400 km.  For the same reason the ISS cannot approach the VAB, the Apollo couldn't.

 

https://www.nasa.gov/mission_pages/station/research/experiments/1043.html

August 15, 2018
10:10 am
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Nunya Bidness
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This article claims the estimate for transiting the Van Allen Belt is 1500 Rem which goes along with my own estimation.

Shielding Space

August 15, 2018
10:39 am
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Nunya Bidness
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The question inquiring minds must ask is if we went to the moon 9 times how could we not know this?  If man actually set foot on the moon would he have not been made painfully aware that it was radioactive?  Lucy, you have got some splaining to do.

Future lunar explorers counting on the moon to shield themselves from galactic cosmic rays might want to think about Plan B.

In a surprising discovery, scientists have found that the moon itself is a source of potentially deadly radiation.

Measurements taken by NASA's Lunar Reconnaissance Orbiter show that the number of high energy particles streaming in from space did not tail off closer to the moon's surface, as would be expected with the body of the moonblocking half the sky.

Rather, the cosmic rays created a secondary — and potentially more dangerous -- shower by blasting particles in the lunar soil which then become radioactive.

"The moon is a source of radiation," said Boston University researcher Harlan Spence, the lead scientist for LRO's cosmic ray telescope. "This was a bit unexpected."

http://www.nbcnews.com/id/3447.....3RjeOhKiUm

August 15, 2018
11:47 am
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Nunya Bidness
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This is independent corroboration of the Van Allen belt radiation levels.

 

5. Summary
RADOM observations beginning within two hours after the launch of the
Chandrayaan-1 and continuing till the end of the mission demonstrated that it
could successfully characterize different radiation fields in the Earth and Moon
environments. Signature and intensity of proton and electron radiation belts,
solar energetic particles as well as galactic cosmic rays were well recognized
and measured. Effect of solar modulation of galactic cosmic rays could also be
discerned in the data. The electron radiation belt doses reached ~40000 μGy/h,
while the maximum flux recorded was ~15000 particle cm-2 s-1. The proton
radiation belt doses reached the highest values of ~130000 μGy/h, while the
maximum flux was ~9600 particle cm-2 s-1. Comparison of these results with
other similar instruments on board ISS shows good consistency, indicating
nominal performance RADOM. Outside the radiation belts, en-route to the
Moon, the particle flux (~3 particle cm-2 s-1) and corresponding dose were very
small (~12 µGy) which further decreased slightly in the lunar orbit because of
the shielding effect of the Moon. Average flux and dose in lunar orbit were
~2.5 particle cm-2 s-1 and ~10 µGy h-1 respectively at 100 km orbit. These
increased to ~2.8 particle cm-2 s-1 and ~11 µGy h-1 respectively, at 200 km orbit.

 

https://bit.ly/2MxWoFR

August 16, 2018
2:55 pm
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Nunya Bidness
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