highaltitude.log.20060216

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[16:17] <Neutrino> you there james?
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[16:46] <jcoxon> hey Neutrino
[16:51] <jcoxon> oops might have missed you
[17:20] <Neutrino> hi back again!
[17:20] <jcoxon> :d
[17:20] <jcoxon> that should have really been :D
[17:21] <jcoxon> welcome to #highaltitude
[17:21] <Neutrino> thanks finally made it
[17:21] <jcoxon> hehe
[17:21] <Neutrino> hows peg2
[17:22] <jcoxon> yeah its going quite well
[17:22] <jcoxon> last night managed to get work out how i was going to construct the container
[17:22] <Neutrino> I noticed you chickened out of using russion radiation detectors
[17:22] <jcoxon> yeah well it was doing very silly things
[17:22] <jcoxon> didn't want to stick high voltage through my gumstix and fry it
[17:23] <Neutrino> dont blame you they find the most difficult way to do things!
[17:23] <jcoxon> (which would make it the second one i've fried)
[17:23] <jcoxon> it seemed they were using a nixie tube (?) to show flashes
[17:23] <Neutrino> probably 1960's technology which equals 1940's to us :)
[17:24] <jcoxon> best to leave it along methinks
[17:24] <jcoxon> alone*
[17:24] <Neutrino> I notice you are going to use film...
[17:24] <jcoxon> yeah it was suggested to me
[17:24] <Neutrino> need plenty of shilding to slow the particles down...
[17:25] <Neutrino> otherwise they go straight through
[17:25] <Neutrino> small piece of lead flashing they use on roofs will work
[17:25] <jcoxon> right cool
[17:25] <jcoxon> okay cool
[17:25] <Neutrino> put small square of lead, small square of 3mm aliminum and small square of paper
[17:26] <Neutrino> then compare the developed squares = radiation
[17:26] <jcoxon> therefore different types will be slowed down by different materials (and thickness)
[17:27] <Neutrino> yes. but put the shileding on both sides if poss, as cosmics create secondary radiation which might confuse things...
[17:27] <Neutrino> and make it in a dark room! :)
[17:27] <jcoxon> got one of those already
[17:27] <jcoxon> hehe
[17:27] <jcoxon> don't worry about that
[17:30] <Neutrino> hey, iv'e got a small digital dose meter spare if you have any use for it? its about 150mm x 80mm ish, measures in mR
[17:30] <Neutrino> displays accuulated dose on a small led display when you press the button.
[17:31] <jcoxon> oooo cool
[17:31] <jcoxon> anyway i can adapt it to prerecord onto my gumstix
[17:33] <Neutrino> ok email me a post address, I will check it over with a ceasium source, over the weekend. should work ok. it's accumulated dose rather than rate, so it will give a total for the whole flight
[17:34] <jcoxon> oh cool
[17:34] <jcoxon> just stick it in the payload container? does polystyrene do anything?
[17:34] <Neutrino> it's a XETEX model 415A might be a pic on the net somewhere.
[17:35] <jcoxon> i'll have a look
[17:36] <Neutrino> will be fine with polystyrene, 1 mR is ~10 uSv so you should get a few numbers, will be interesting to see what sort of dose it gets, Ive always been told :never be a poliot if you want kids :)
[17:36] <Neutrino> sp . pilot
[17:37] <jcoxon> hehe
[17:38] <jcoxon> how is answer going?
[17:39] <Neutrino> ok, got the forms today, not ready to fill them in yet, been looking into suitable antennas at the moment
[17:39] <jcoxon> ( i guess with the accumulated rate i should leave it around for an hour to calculate the background surface count)
[17:39] <jcoxon> forms? from the CAA?
[17:41] <Neutrino> hour? more like a week! normal background is around 0.2 uSv/Hr so to get one count you would need to leave for 50 hours for one digit change, but the good news is the radiation up there is very high.
[17:41] <Neutrino> yes caa forms
[17:42] <Neutrino> not ness to take a background as it is already defined, so what it reads will be all due to cosmic
[17:42] <jcoxon> oh right, cool
[17:43] <jcoxon> in regards to the CAA forms i don't even think about them till my payload is nearly finsihed
[17:43] <jcoxon> which it is, well nearly
[17:43] <jcoxon> hehe
[17:43] <Neutrino> yes I wont send them in for ages but I intend to do a simple test launch just for practice
[17:44] <jcoxon> oh cool
[17:44] <Neutrino> Fraid I have to go, I'm at work and they are about to lock up,
[17:44] <jcoxon> no probs
[17:44] <jcoxon> good chatting to you
[17:45] <Neutrino> so cya around, youve got me email
[17:45] <Neutrino> l8tr
[17:45] <jcoxon> cya
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[19:40] <Proffy> howdy
[19:46] Nick change: Proffy -> Professor
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[00:00] --- Fri Feb 17 2006