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Toby Jug

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  1. Hi Sensei (and others). Hope you are well. Kodak really were the experts in protecting sensitive equipment (like film) from radiation. You're absolutely correct about naturally occurring radioisopes. They could cope with most naturally occurring radioisotopes (and also the brief use of Radium to make fluorescent paint) and this is why they were quite selective about where their paper and similar packaging materials came from. They were less able to cope with fall-out from nuclear testing. But throughout all of this, Ultraviolet penetration through cardboard and paper wasn't a proble
  2. Hi everyone. String-Junky, you're absolutely right about it being just a CLAIM. Have you seen the warranty information on Verbatim's website for the product? I've copied-and-pasted some of it. It's the funniest thing I've seen all day. Verbatim Americas, LLC warrants this product to be free from defects in material and workmanship. If this product is found to be defective, it will be replaced at no cost to you. You may return it with your original cash register receipt to the place of purchase or contact Verbatim. In the U.S. and Canada, call 800-538-8589. Product replacem
  3. @studiot Thanks again. I'm going to try and stay off this forum for a day and actually do some of the things I've spoken about, like read a book. I honestly don't know how you manage to make such pleasant replies each time. I gave up a bit of time to answer a question about cardboard boxes only to become reasonably convinced that whatever that post was about it wasn't really about cardboard or protecting DVDs in a box. Take care of yourself studiot and be careful what you spend your time on.
  4. Nothing blocks UV completely. 100 kilometers of lead wouldn't do it but it would cut the proportion of UV passing through to such a small amount that we would say it had been completely stopped. It's difficult to find actual data to show the proportion of UV blocked by cardboard but there is general concensus that only the highest energies UV-C are likely to penetrate to any significant amount. Are your DVD's in a plastic case and is that case actually a polycarbonate? We have a lot more data about the performance of polycarbonate and other plastics against UV. The Kodak company were
  5. No, not quite. Raios Gamma = Gamma Rays. Raios X = X rays. Both of these are electro-magnetic radiations with much higher energies than visibile light. UV is much more like visible light.
  6. Hi. Looks like you've had plenty of good advice. UV is not that different from visible light, so unless your cardboard is not like most cardboard (a conventional mesh of cellulose fibres) you'll be fine. However, the bigger problem may be heat build up. The light-coloured and glossy boxes you have in your photos are the safer ones, these will reflect most of the light. The black and matt finish cardboard boxes will just absorb the light (including UV) and get both the box and it's contents hot. Plastic DVD's and CD's warp in the heat and this will be a bigger problem than anythin
  7. Thanks Studiot. That looks like exactly the sort of thing that would be useful for the sort of distance learning I will be doing. I seriously considered studying with the O.U. but at the current time they seem to offer only "Space Science and Technology" rather than "Astronomy" or "Astrophysics". As far as I can tell their course has more emphasis on technology and project management than I may like. However, borrowing the bits that are of interest from their reading list seems like an excellent idea and is exactly what I wanted. As reagrds the fourth book, an introduction to gene
  8. Hi everyone. Overview: I'm old but still have an interest in learning stuff. I was going to try and get on an undergraduate or post-graduate course in Astronomy or Astrophysics but circumstances have changed, people have become ill and I won't be doing any of that for... an unknown but long time. So I'm just going to do some reading at home but it seems sensible to use an undergraduate or post-graduate degree as a basis to guide that reading. A Google search for recommended reading lists from major universities offering a graduate or postgraduate course in Astrophysics or Astronomy
  9. Just my opinion: There is no shortage of ideas. Artist's frequently have the most incredible ideas and sometimes novelist's have an idea that changes the way an entire society see the world. Surely, ideas are their primary currency but even in those fields people are initially recruited into the profession based on other skills they have. Artists must be able to express their ideas in an artistic way, novellist's must be proficient in a language and then demonstrate an ability to communicate emotively despite the syntactic limits of that language. Most of the time a Scientist is no
  10. Hopefully, you enjoy yourself and understand something better. I'm just going to focus on the use of this forum. Others have spoken in more general terms about the history of developments in Physics. What's the point of the general public discussing (and replying to) ideas in this forum? 1. It may be that you realise why things can't be the way you thought - but that is not to be thought of as a negative thing ("oh, I was wrong"). It is progress and development in your understanding. 2. It may be a practical benefit. For example, getting the right temperature of light bul
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