From: White, John A \<John.White3@West.Boeing.com\>

To: Banks-Jr, Marvin \<marvin.e.banks-jr@boeing.com\>; Cash, Timothy

\<timothy.j.cash@boeing.com\>; EXT-Bickel, Gary
\<Gary.Bickel@West.Boeing.com\>;

Gastelum, David \<David.Gastelum@PSS.Boeing.com\>; Gill, David

\<DAVID.GILL@West.Boeing.com\>; NASA - Goddard -Kolasinsky, John

\<jkolasin@pop700.gsfc.nasa.gov\>; NASA Goddard - Leidecker, Henning

\<me@leidecker.gsfc.nasa.gov\>; NASA Goddard - Ott, Melanie

\<melanie.ott@gsfc.nasa.gov\>; NASA Goddard - Plante, Jannett

\<jplante@swales.com\>; NASA JSC - Beverly, David

\<David.W.Beverly1@JSC.nasa.gov\>; NASA JSC - Prestridge, Raymond

\<ray.prestridge@lmco.com\>; Royo, Jose \<JOSE.ROYO@West.Boeing.com\>;
Tallman,

Curtis \<Curt.Tallman@SW.Boeing.com\>; Vallejo, Max
\<Max.A.Vallejo@boeing.com\>

Date: Wednesday, March 08, 2000 8:46 AM

Subject: Radiation Testing

\>To all:

\>

\>I am forwarding some of the conversation that I have been having with
Jerry

\>Wert in Seattle. Yesterday, Tiru Rao-Sahib said that the radiation

\>requirement in Rev C is 4 times the real exposure which is about where
it

\>should be for qualification testing.

\>

\>John A. White

\>EEE Parts IPT

\>International Space Station

\>Boeing - Huntington Beach

\>(714) 896-3311 X70236

\>

\>

\>\-\-\-\--Original Message\-\-\-\--

\>From: White, John A

\>Sent: Tuesday, March 07, 2000 5:08 PM

\>To: Wert, Jerry

\>Cc: Rao-Sahib, Tirumal S

\>Subject: RE: Radiation Testing

\>

\>Jerry,

\>

\>I am passing your email to Tiru who is best qualified to answer your

\>specific questions. I think the X-POP orbit is about 190 or 200 miles.

\>

\>John A. White

\>EEE Parts IPT

\>International Space Station

\>Boeing - Huntington Beach

\>(714) 896-3311 X70236

\>

\>

\> \-\-\-\--Original Message\-\-\-\--

\> From: Wert, Jerry

\> Sent: Tuesday, March 07, 2000 4:53 PM

\> To: White, John A

\> Subject: RE: Radiation Testing

\>

\> John,

\>

\> Sorry, but what does X-POP mean?

\>

\> We have been testing electronic components and assemblies

\>per NASA SSP 30512 (Revision C). According to 30512, 100 krad(Si)
exposure

\>over the life of Space Station, implies shielding thickness of

approximately

\>7 MIL (10 year dose in semi-infinite aluminum medium \[i.e.,
external\]).

For

\>comparison, the 10 year dose at the center of a 500 MIL (radius) solid

\>aluminum sphere (i.e., internal to Space Station) is approximately 500

\>rad(Si). Thus, shielding information is important to accurately assess
the

\>dose environment. For instance, is the fiber-optic cable on the
outside

\>(external) of Space Station? If so, what type of outside cladding
material

\>(material type and thickness) will be used?

\>

\> Regarding verification verbiage, although I need to look

\>into it a bit more, the test procedure as outlined in SSQ 21654 seems
to be

\>a good starting point. I\'m not sure I fully understand the rational
for

the

\>rigorous irradiation/anneal sequences as specified in sec. 4.10.13,
but

will

\>explore it further.

\>

\> Please feel free to give me a call when you have some time,

\>so that we can discuss this matter.

\>

\> Regards,

\> Jerry L. Wert

\> Manager (Acting)

\> Boeing Radiation Effects Laboratory

\> phone: (206) 544-5506

\> fax: (206) 544-5438

\> email: jerry.wert@Boeing.com

\>\<mailto:jerry.wert@Boeing.com\>

\>

\> \-\-\-\-\-\-\-\-\--

\> From: White, John A

\> Sent: Tuesday, March 07, 2000 10:41 AM

\> To: Wert, Jerry

\> Subject: RE: Radiation Testing

\>

\> Jerry,

\>

\> Jerry,

\>

\> I am not too familiar with radiation testing and I

\>need some help to define an adequate requirement and verification for
our

\>fiber optic cable used on the Space Station. In fact, the information
I

\>originally sent you is all I have. Two questions: 1. Is the
requirement

\>appropriate for a X-POP orbit and 2. Can you give the standard
requirement

\>and verification verbiage for radiation testing fiber optic cables?

\>

\> John A. White

\> EEE Parts IPT

\> International Space Station

\> Boeing - Huntington Beach

\> (714) 896-3311 X70236

\>

\>

\> \-\-\-\--Original Message\-\-\-\--

\> From: Wert, Jerry

\> Sent: Friday, March 03, 2000 4:23 PM

\> To: Krinsky, Jeffrey A; White, John A

\> Cc: Gill, David J

\> Subject: RE: Radiation Testing

\>

\> John,

\>

\> Jeff Krinsky left the Boeing company seeking

\>greener pastures with AT&T (Our loss, his gain).

\>

\> We would be delighted to support this

\>effort. The Laboratory has two irradiators which would meet your dose
rate

\>requirements. The BREL Shepherd irradiator can be utilized to perform
the

\>room temperature exposures. The high and low temperature exposures can
be

\>performed using a unique temperature controller system designed for
fiber

\>optic cable testing at the Boeing GammaVault facility. Please refer to
the

\>following URL for more information:

\>http://www-kntapp-01.ds.boeing.com/physics/radiation/equip/gamma.htm

\>\<http://www-kntapp-01.ds.boeing.com/physics/radiation/equip/gamma.htm\>
.

\>Jeff and I performed several irradiations of optical fibers under
similar

\>conditions in the past and I don\'t think this test would be very
difficult.

\>We could easily develop a program using National Instrument\'s LabView

\>software to acquire the launched power (reference) and detected power

\>(attenuation) at regular intervals during the exposures.

\>

\> Perhaps we should arrange a telecon to

\>discuss this matter further?

\>

\> Jerry L. Wert

\> Manager (Acting)

\> Boeing Radiation Effects Laboratory

\> phone: (206) 544-5506

\> fax: (206) 544-5438

\> email: jerry.wert@Boeing.com

\>\<mailto:jerry.wert@Boeing.com\>

\>

\> \-\-\-\-\-\-\-\-\--

\> From: White, John A

\> Sent: Friday, March 03, 2000 2:28 PM

\> To: Wert, Jerry; Krinsky, Jeffrey A

\> Cc: Gill, David J

\> Subject: Radiation Testing

\>

\> Hi Jerry and Jeff,

\>

\> I am working on the Space Station program

\>and we are in the middle of requalifying the fiber optic cable. Below
is

\>our radiation requirement. Can you help coordinate this effort through

your

\>labs?

\> 3.9.6 Radiation Resistance (from

\>SSQ 21654)

\>

\> The cable attenuation rate shall be less

\>than 20 dB/Km when exposed to Co-60 irradiation under the following

\>conditions:

\>

\> 1. Temperature of 25 degrees C

\> 2. A dose-rate of 0.1 rad(Si)/sec

\> 3. A total dose of 118 krad(Si), and

\> 4. A continuous optical signal between

\>1 and 10 microwatts and an optical source in accordance with paragraph

\>4.10.12.1.

\>

\> I would like to use a computer to measure

\>the optical power every how so we can determine the loss increase due
to

\>exposure and then the recovery after the exposure. Also, is it
possible to

\>do three tests one at -120\*C, RT and 120\*C.

\>

\>

\> John A. White

\> EEE Parts IPT

\> International Space Station

\> Boeing - Huntington Beach

\> (714) 896-3311 X70236

\>

\>

\>