Author Topic: Radiation  (Read 938882 times)

Offline Jason Thompson

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Re: Radiation
« Reply #735 on: April 02, 2018, 04:43:25 PM »
What are you saying?  The graph doesn't represent the actual data?  Tell me it isn't so.

It isn't so.

Tim, you have a data set and a graph from the same source that YOU provided to this discussion. Do you believe the data supplied on that website is fake or the graph is fake? If you believe one or other is wrong why do you think it can support your argument at all?

Once again, you will not consider that it is YOU that is wrong about your interpretation of the graph, will you?
"There's this idea that everyone's opinion is equally valid. My arse! Bloke who was a professor of dentistry for forty years does NOT have a debate with some eejit who removes his teeth with string and a door!"  - Dara O'Briain

Offline bknight

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Re: Radiation
« Reply #736 on: April 02, 2018, 04:43:34 PM »
I have looked at the numbers and I cannot begin to imagine how you believe Apollo 11 could have operated in cislunar space, transited the VAB and landed on the moon and have received only .22 mgy/day.

Thag is NOT what I asked. Do you acknowledge that GCR rates less than 0.2mGy/day were recorded in the data you presented to us or not?

Show me on this graph where you see a dose rate of less than .2 mgy/day.  I blew it up and still don't see it.  I would have used the graph from 1969 but it was expended when the astronauts ran out of toilet paper.
This graph is clearly logarithmic.
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Offline Luke Pemberton

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Re: Radiation
« Reply #737 on: April 02, 2018, 04:44:22 PM »
What are you saying?  The graph doesn't represent the actual data?  Tell me it isn't so.  How can we trust scientist if they can used a spreadsheet to reproduce a graph.  Preposterous!

  • The numbers match the graph.
  • The numbers show the dose can be less than 0.22 mG/day.
  • You have not interpreted the scaling correctly.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former - Albert Einstein.

I can calculate the motion of heavenly bodies, but not the madness of people – Sir Isaac Newton.

A polar orbit would also bypass the SAA - Tim Finch

Offline bobdude11

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Re: Radiation
« Reply #738 on: April 02, 2018, 04:50:46 PM »
...
What you need to understand about this forum is that you will be questioned in a Socrastic manner by some members to determine your level of expertise.

...

Ahh ... the rare sarcastic, Socratic method ... :)
Robert Clark -
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I am moving to Theory ... everything works in Theory
"Everybody remember where we parked." James Tiberius Kirk, Captain, U.S.S. Enterprise

Offline Luke Pemberton

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Re: Radiation
« Reply #739 on: April 02, 2018, 04:52:59 PM »
...
What you need to understand about this forum is that you will be questioned in a Socrastic manner by some members to determine your level of expertise.

...

Ahh ... the rare sarcastic, Socratic method ... :)

Thanks... he was mate of Plateo and Hippopotamuscrates  :-[
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former - Albert Einstein.

I can calculate the motion of heavenly bodies, but not the madness of people – Sir Isaac Newton.

A polar orbit would also bypass the SAA - Tim Finch

Offline theteacher

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Re: Radiation
« Reply #740 on: April 02, 2018, 04:54:42 PM »
I have looked at the numbers and I cannot begin to imagine how you believe Apollo 11 could have operated in cislunar space, transited the VAB and landed on the moon and have received only .22 mgy/day.

Thag is NOT what I asked. Do you acknowledge that GCR rates less than 0.2mGy/day were recorded in the data you presented to us or not?

Show me on this graph where you see a dose rate of less than .2 mgy/day.  I blew it up and still don't see it.  I would have used the graph from 1969 but it was expended when the astronauts ran out of toilet paper.
This graph is clearly logarithmic.

- by definition, one might add.

Offline timfinch

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Re: Radiation
« Reply #741 on: April 02, 2018, 04:55:01 PM »
We must agree to disagree but I think the graph would work against you if it was logarithmic.

How, exactly? SHow me, precisely, how that y-axis is anyhting but logarithmic. Considering that there are two sets of dotted lines, one corresponding to x-axis divisions and one to y-axis. Especially note the posiition of the horizontal line where the 10^0 y-axis value is.

Now tell me why I should interpret that graph as anything other than an industry standard logaithmic scale, and the answer the question I have asked you half a dozen times now. WHy will you not look at the numbers?
The simple test is to check for linearity.  If the data is linear then it is not a logarithmic graph.

Offline Jason Thompson

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Re: Radiation
« Reply #742 on: April 02, 2018, 04:58:06 PM »
The simple test is to check for linearity.  If the data is linear then it is not a logarithmic graph.

Tim, do you or do you not acknowledge that data is recorded in that set that clearly shows levels of less than 0.2mGy/day were recorded?

Secondly, here's a simple test for you. Download that data into Excel and plot the graph. It just took me all of five minutes to do that, and when I put the y-axis to a log scale lo and behold it looks just like that graph.
"There's this idea that everyone's opinion is equally valid. My arse! Bloke who was a professor of dentistry for forty years does NOT have a debate with some eejit who removes his teeth with string and a door!"  - Dara O'Briain

Offline Obviousman

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Re: Radiation
« Reply #743 on: April 02, 2018, 05:00:53 PM »


Offline Luke Pemberton

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Re: Radiation
« Reply #744 on: April 02, 2018, 05:02:26 PM »
The simple test is to check for linearity.  If the data is linear then it is not a logarithmic graph.

No, that's not how it works.  ???
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former - Albert Einstein.

I can calculate the motion of heavenly bodies, but not the madness of people – Sir Isaac Newton.

A polar orbit would also bypass the SAA - Tim Finch

Offline timfinch

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Re: Radiation
« Reply #745 on: April 02, 2018, 05:04:39 PM »
The simple test is to check for linearity.  If the data is linear then it is not a logarithmic graph.

Tim, do you or do you not acknowledge that data is recorded in that set that clearly shows levels of less than 0.2mGy/day were recorded?

Secondly, here's a simple test for you. Download that data into Excel and plot the graph. It just took me all of five minutes to do that, and when I put the y-axis to a log scale lo and behold it looks just like that graph.
I do but it is important to note that the graph we speak of is summation graph where the detector outputs were added and averaged.  The graph is derived from the very data that you laud before me.  How can you doubt the authenticity of the graph.  I didn't make it, they did.

Offline bobdude11

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Re: Radiation
« Reply #746 on: April 02, 2018, 05:06:22 PM »
Ah, I wasn't expecting a return to the debate!!

I do have a question for Mr Finch, as regards the measured, or generally accepted figures for radiation levels in space beyond the VAB.  (I originally brought it up in post #550, but I'll summarise here as well.)

I work for a company which develops data handling technologies* for spacecraft.  I'm on the software side of things, but I know our chip design folks have to consider a lot of factors about the environment their designs will be used in.  Since the data they're using is based on the generally accepted measurements and models, why aren't there a lot more failures of missions operating in these regions?

As I also noted in my previous post, it's not just NASA that's involved in determining radiation risks, but private companies and other organisations in the US, and around the world, and even small independent groups like the Lunar X-Prize teams.

Either :
a) the failure rates are being covered up, or
b) all the engineers, all over the world, are in some great conspiracy to lie about the figures, or
c) all missions outside of LEO are fakes, or
d) the space radiation environment has been correctly measured and modelled, and allows for safe design of both manned and unmanned missions

Which, in your opinion, is the explanation?


[ * The same technology has been used on well over 100 missions, including LRO, MRO and Mars Express, and will launch on BepiColombo, JWST and several other upcoming spacecraft.]
The technology obviously exist to operate electronic equipment in the SAA and passing through the VAB.  Missions in this high radiation background have shorter life expectancies than missions that remain in LEO.  I can't begin to answer your question without comparative data.  I am sure redundancy and hardened equipment was used in designing electronic equipment for the hazards of space.  What has any of this to do with my claim that Apollo 11's mission dose is unrealistic in light of recent empirical data?
Ah, the joys of being in a different time zone...  ;D

The relevance to the Apollo missions is that the data used for shielding, design of rad-hard electronics etc. is based on the measurements over many years, starting pre-Apollo.  The published, currently available data, which has been used for many, many missions, shows that the environment outside LEO and the VAB is not as hostile as you claim, and certainly not enough to prevent manned lunar missions.

You're claiming that this data, used by engineers in many countries, is incorrect, and misrepresents the actual environment, but the success and reliability of missions to the Moon, Mars and beyond, to Lagrange points etc. says otherwise.

Perhaps you ought to familiarise yourself with spacecraft reliability and failure data, because radiation damage is not the primary cause of missions failures (even ignoring launch failure and human errors).

Why would I.  I have made no claims about mission survivability.  I don't even claim that the radiation hazards are insurmountable.  The only claim I make and am willing to defend is the mission doses of Apollo 11 do not represent realistic values in light of current data.  Anything else is yours.

Speaking from a non-expert in this field, no, no you are not willing to defend. Hand-waving, deflection, insults, those are your 'debate' method of choice. You have not made any argument that I find remotely convincing. On the other hand, I have read about all of the missions around: Apollo, Gemini, Mercury, Space-X, the Space Shuttle, and even what I can about various Russian (pre- and post- Cold War), and Chinese space missions. What I can say is this (obviously from a very layman's' perspective):
All these missions all occurred as recorded and the data around them is irrefutable. The experts on this forum have bent over backwards to steer you in the direction of a correct diagnosis of the data.
Instead you choose to ignore the information presented, instead you repeat your incorrect assumptions, demand they offer something (I am not sure what) to refute you (which they have repeatedly done. You then, when you don't get the answer you demand, begin insulting them. You have proven post after post that you do not understand what you are reading, bluster about your military experience (which sounds to me like a standard certificate course the military provides - I have one for my Security Police training, that doesn't make me a lawyer), and refusal to admit that your initial diagnoses and determinations were simply wrong.
Please stop being obtuse and either admit your are wrong or just go back to your sycophantic forums.
Robert Clark -
CISSP, MISM, MCSE and some other alphabet certifications.
I am moving to Theory ... everything works in Theory
"Everybody remember where we parked." James Tiberius Kirk, Captain, U.S.S. Enterprise

Offline timfinch

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Re: Radiation
« Reply #747 on: April 02, 2018, 05:06:44 PM »
The simple test is to check for linearity.  If the data is linear then it is not a logarithmic graph.

No, that's not how it works.  ???
Sure it is, a logarithmic graph is plotted using the log of the data points and not the data points themselves

Offline Luke Pemberton

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Re: Radiation
« Reply #748 on: April 02, 2018, 05:09:18 PM »
I do but it is important to note that the graph we speak of is summation graph where the detector outputs were added and averaged.

...and if you take the average of 2 points whose values are both less than 0.22 mGr/day, will your average be:

  • less than 0.22 mGr/day
  • greater than 0.22 mGr/day


Quote
The graph is derived from the very data that you laud before me.  How can you doubt the authenticity of the graph.  I didn't make it, they did.

You brought the data here, and we don't doubt the authenticity of the graph. You did not read the scale correctly.
« Last Edit: April 02, 2018, 05:11:42 PM by Luke Pemberton »
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former - Albert Einstein.

I can calculate the motion of heavenly bodies, but not the madness of people – Sir Isaac Newton.

A polar orbit would also bypass the SAA - Tim Finch

Offline timfinch

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Re: Radiation
« Reply #749 on: April 02, 2018, 05:12:17 PM »
Ah, I wasn't expecting a return to the debate!!

I do have a question for Mr Finch, as regards the measured, or generally accepted figures for radiation levels in space beyond the VAB.  (I originally brought it up in post #550, but I'll summarise here as well.)

I work for a company which develops data handling technologies* for spacecraft.  I'm on the software side of things, but I know our chip design folks have to consider a lot of factors about the environment their designs will be used in.  Since the data they're using is based on the generally accepted measurements and models, why aren't there a lot more failures of missions operating in these regions?

As I also noted in my previous post, it's not just NASA that's involved in determining radiation risks, but private companies and other organisations in the US, and around the world, and even small independent groups like the Lunar X-Prize teams.

Either :
a) the failure rates are being covered up, or
b) all the engineers, all over the world, are in some great conspiracy to lie about the figures, or
c) all missions outside of LEO are fakes, or
d) the space radiation environment has been correctly measured and modelled, and allows for safe design of both manned and unmanned missions

Which, in your opinion, is the explanation?


[ * The same technology has been used on well over 100 missions, including LRO, MRO and Mars Express, and will launch on BepiColombo, JWST and several other upcoming spacecraft.]
The technology obviously exist to operate electronic equipment in the SAA and passing through the VAB.  Missions in this high radiation background have shorter life expectancies than missions that remain in LEO.  I can't begin to answer your question without comparative data.  I am sure redundancy and hardened equipment was used in designing electronic equipment for the hazards of space.  What has any of this to do with my claim that Apollo 11's mission dose is unrealistic in light of recent empirical data?
Ah, the joys of being in a different time zone...  ;D

The relevance to the Apollo missions is that the data used for shielding, design of rad-hard electronics etc. is based on the measurements over many years, starting pre-Apollo.  The published, currently available data, which has been used for many, many missions, shows that the environment outside LEO and the VAB is not as hostile as you claim, and certainly not enough to prevent manned lunar missions.

You're claiming that this data, used by engineers in many countries, is incorrect, and misrepresents the actual environment, but the success and reliability of missions to the Moon, Mars and beyond, to Lagrange points etc. says otherwise.

Perhaps you ought to familiarise yourself with spacecraft reliability and failure data, because radiation damage is not the primary cause of missions failures (even ignoring launch failure and human errors).

Why would I.  I have made no claims about mission survivability.  I don't even claim that the radiation hazards are insurmountable.  The only claim I make and am willing to defend is the mission doses of Apollo 11 do not represent realistic values in light of current data.  Anything else is yours.

Speaking from a non-expert in this field, no, no you are not willing to defend. Hand-waving, deflection, insults, those are your 'debate' method of choice. You have not made any argument that I find remotely convincing. On the other hand, I have read about all of the missions around: Apollo, Gemini, Mercury, Space-X, the Space Shuttle, and even what I can about various Russian (pre- and post- Cold War), and Chinese space missions. What I can say is this (obviously from a very layman's' perspective):
All these missions all occurred as recorded and the data around them is irrefutable. The experts on this forum have bent over backwards to steer you in the direction of a correct diagnosis of the data.
Instead you choose to ignore the information presented, instead you repeat your incorrect assumptions, demand they offer something (I am not sure what) to refute you (which they have repeatedly done. You then, when you don't get the answer you demand, begin insulting them. You have proven post after post that you do not understand what you are reading, bluster about your military experience (which sounds to me like a standard certificate course the military provides - I have one for my Security Police training, that doesn't make me a lawyer), and refusal to admit that your initial diagnoses and determinations were simply wrong.
Please stop being obtuse and either admit your are wrong or just go back to your sycophantic forums.

Sycophantic?  I am an island in a sea of like minded people and you speak to me of sycophants.  There is as much separation in the collective thought pattern of this forum as there is space between the protons and neutrons of a helium atom.  Not an original thought exist in the lot of you.