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- Newsgroups: sci.physics.fusion
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!pacbell.com!tandem!zorch!fusion
- From: ames!FNALD.FNAL.GOV!DROEGE
- Subject: Can't type
- Message-ID: <920724111051.2020129f@FNALD.FNAL.GOV>
- Sender: scott@zorch.SF-Bay.ORG (Scott Hazen Mueller)
- Reply-To: ames!FNALD.FNAL.GOV!DROEGE
- Organization: Sci.physics.fusion/Mail Gateway
- Date: Fri, 24 Jul 1992 17:43:23 GMT
- Lines: 53
-
- From: FNALD::DROEGE 23-JUL-1992 17:43:21.78
- To: GOV%"fusaion%zorch@ames.arc.nasa.gov"
- CC: DROEGE
- Subj: Radiation Lengths
-
- I walked down the hall and found a physicist with a famous little blue book.
-
- Radiation Lengths:
-
- Lead 0.56 cm
- Concrete 10.7 cm
- Water 36 cm
-
- A radiation length is the length of material required for the intensity of
- the gamma rays to fall to 1/e of their initial intensity. Does not seem to
- be a strong function of wave length, or there would have been more data.
- But this obviously does not work at really long wave lengths (i.e. visible
- light). Possibly you start calling them gamma rays when this starts working.
-
- I notice that it is getting hard to tell my "set" of private information from
- the "set of all information revealed on the net". A AND NOT B = 0 ???
-
- So if I wanted to shoot gamma rays in from outside, they would not be bothered
- much by 5/8" inches of aluminum, a mm or so of ss, and all that styrafoam. But
- the geometry is important. Those of you who can look up the drawing of my
- calorimeter in ICCF2 will notice that it would be possible to cut a hole in the
- outside of the foam, through the aluminum inner layer, and through more foam,
- and that this could be done with a dremmel tool while the experiment was
- running. This would allow placing a source within about 10 cm of the running
- cell. Plugging the hole with foam would pretty much preserve the calorimeter.
- In any case if not true, one would see a big change in balance while grinding.
-
- I should tell you all that long before there was any communication with Ying
- there was a radium dial watch taped to the outside of the calorimeter on day
- 1 and it was inside on top of the cell on day two. No obvious result.
-
- Of course, moving a source that was 10 cm away from a cell to say 10' away
- would change the intensity by a factor 62500. Enough of a factor to do
- an experiment. Most of the above in answer to John Logajan.
-
- Richare Long gives some information obtained about Ying's earlier work which
- I presume is now public. Not clear who is quoted but Long writes "the setup
- doesn't work with Co60 alone...". Perhaps Ying and Chow did not have a
- very sensitive detector. The stuff in the TV picture looks pretty crude.
- Again commenting on John Logajan's butt kicking source, perhaps Ying could not
- tell 1/2 watt from 20 watts.
-
- There is only one piece of protected information in the kit I received from
- Ying. It contains a specific configuration and a specific procedure. I am
- not following the procedure yet, though I plan to when the stuff arrives. I
- am really only doing what anyone could do reading the stuff posted here.
-
- Tom Droege
-