[ RadSafe ] A long shot here ....

Sat Dec 19 16:54:39 CST 2015

McCarn,

     Woods Hole Oceanographic Institute has a Van de Graaf which it uses
for Accelerator Mass Spectrometry/Tandem Accelerator Mass Spectrometry.
Other places still have Van de Graafs too---see their physics and/or
geology departments for information.  UPenn, Yale, Rochester, UMass/Lowell,
Purdue, UArizona???, UWashington, Idaho State, SUNY/Albany, Ohio U., TUNL,
UFlorida???, East Carolina (Pelletron), UArizona???, etc.

     Joe Preisig

On Sat, Dec 19, 2015 at 5:07 PM, Ted de Castro <tdc at xrayted.com> wrote:

> shocking!
>
>
> On 12/18/2015 11:01 PM, Dan McCarn wrote:
>
>> Well, perhaps it was that van de Graaff accelerator that I played with as
>> a
>> kid...
>>
>> Dan ii
>>
>> Dan W McCarn, Geologist
>> 108 Sherwood Blvd
>> Los Alamos, NM 87544-3425
>> +1-505-672-2014 (Home – New Mexico)
>> +1-505-670-8123 (Mobile - New Mexico)
>> HotGreenChile at gmail.com (Private email) HotGreenChile at gmail dot com
>>
>> On Fri, Dec 18, 2015 at 1:30 PM, Joseph Preisig <jrpnj01 at gmail.com>
>> wrote:
>>
>> McCarn,
>>>
>>>      HMMMM.  So, that's what happened to you, huh???
>>>
>>>      Joe Preisig
>>>
>>>
>>>
>>> On Fri, Dec 18, 2015 at 3:06 PM, Ted de Castro <tdc at xrayted.com> wrote:
>>>
>>> Probably not - HV too low.  AND the tube is gas filled - NOT vacuum - so
>>>> the electrons would not impinge on the anode at full energy.
>>>>
>>>>
>>>> On 12/18/2015 11:52 AM, Dan McCarn wrote:
>>>>
>>>> Dang!
>>>>>
>>>>> That would mean that my old 5kv at 0.5 amp power supply with a
>>>>> full-wave
>>>>> rectifier consisting of 4 mercury vapor tubes (that glowed so eerily)
>>>>> probably gave me a dose in my teens.
>>>>>
>>>>> Dan W McCarn
>>>>> 108 Sherwood Blvd
>>>>> Los Alamos, NM 87544 USA
>>>>> +1-505-670-8123
>>>>> Sent from my iPhone
>>>>>
>>>>> On Dec 18, 2015, at 12:44, Ted de Castro <tdc at xrayted.com> wrote:
>>>>>
>>>>>> On page 164 of the 1970 Radiological Health Handbook is a very useful
>>>>>> graph entitled "Half-Value layers at Photon from 10 keV to 10 meV".
>>>>>>
>>>>>> I was looking into electronic ways to interpolate values from the
>>>>>> graph
>>>>>> but found that the only twp pieces of software that would allow me to
>>>>>>
>>>>> get
>>>
>>>> absolute pixel coordinates from the image are Photo Shop or MatLab - I
>>>>>>
>>>>> have
>>>
>>>> neither and can't afford either.  (with the pixel coordinates of the 4
>>>>>> corners of the plot and the point of interest - a spreadsheet that
>>>>>>
>>>>> would
>>>
>>>> return the value of the point of interest would be a trivial exercise).
>>>>>>
>>>>>> So - the question here is - does anyone have this plot in a better
>>>>>> quality electronic image, or has anyone worked out the data points
>>>>>> from
>>>>>> which it was compiled or has anyone come up with or found an
>>>>>>
>>>>> electronic way
>>>
>>>> to get this information?
>>>>>>
>>>>>> Thanks
>>>>>> _______________________________________________
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>
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