[ RadSafe ] Astrophysicists Report Radioactive Cobalt in Supernova Exp...

Mon Sep 8 17:11:17 CDT 2014

Mike/Radsafe,

    Interesting.  The recovery of a spaceship's  electronics from EMP or a 
gamma pulse would depend on the radiation level.   Some defense electronics 
will turn off if such a radiation pulse is detected,  wait some interval of 
time, and then the electronics will attempt to  restart.

    Joe Preisig

In a message dated 9/8/2014 5:56:41 P.M. Eastern Daylight Time,  
Mike.Brennan at DOH.WA.GOV writes:

Some  time ago an astrophysicist friend of mine sent me some numbers for 
the output  of gamma ray bursts, and possible effects on the crew of the 
International  Space Station.  I don't remember the numbers, but if the source 
was in  our galaxy, and the Earth was in the beam, it would be bad.  As to the 
 Space Station, I couldn't tell if the exposure would kill the crew 
outright,  or if they would hold on long enough die from complete failure of every 
system  on station.  The effects on the surface of the planet wouldn't be 
good,  either.  

-----Original Message-----
From:  radsafe-bounces at health.phys.iit.edu  
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of KARAM,  PHILIP
Sent: Monday, September 08, 2014 12:45 PM
To: The International  Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ]  Astrophysicists Report Radioactive Cobalt in 
Supernova Explosion

Yep!  Due to shielding by the supernova remnant only about 10% of the gamma 
 radiation escapes into space, and that's over the space of a year.  I  
calculated that a supernovae would be close enough to Earth to give a  
sea-level dose of 1 Sv about once every 10 million years or so. But to get a  lethal 
dose of radiation in a short period of time you'd have to be pretty  close 
and think it's safe to say that the radiation wouldn't be what killed  you.

Andy

P. Andrew Karam, PhD, CHP
NYPD  Counterterrorism
One Police Plaza, Room 1109
New York, NY 10038
(718)  615-7055 (desk)
(646) 879-5268 (mobile)

-----Original  Message-----
From: radsafe-bounces at health.phys.iit.edu  
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Brennan, Mike  (DOH)
Sent: Monday, September 08, 2014 11:40 AM
To: The International  Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ]  Astrophysicists Report Radioactive Cobalt in 
Supernova Explosion

As I  understand it, if you are close enough to a supernova that the gamma 
is  significant, you have other fairly pressing concerns.

-----Original  Message-----
From: radsafe-bounces at health.phys.iit.edu  
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of KARAM,  PHILIP
Sent: Monday, September 08, 2014 7:18 AM
To: ROY HERREN; The  International Radiation Protection (Health Physics) 
Mailing List;  Radsafe
Subject: Re: [ RadSafe ] Astrophysicists Report Radioactive Cobalt  in 
Supernova Explosion

Supernovae produce about a solar mass (10^30 kg)  of Co-56, which decays to 
Ni-56, and thence to Fe-56. The total amount of  gamma energy released by 
the decay of the Co-56 and Ni-56 to stability is more  than 10^49 ergs. I 
wrote a paper on this topic - along with the attenuation of  the gamma dose by 
the supernova remnant and radiation dose to nearby stars and  planets - in 
2002; I believe it appeared in Radiation Physics and  Chemistry.

http://www.sciencedirect.com/science/article/pii/S0969806X01004546

Cool  stuff!

Andy

P. Andrew Karam, PhD, CHP
NYPD  Counterterrorism
One Police Plaza, Room 1109
New York, NY 10038
(718)  615-7055 (desk)
(646) 879-5268 (mobile)

-----Original  Message-----
From: radsafe-bounces at health.phys.iit.edu  
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of ROY HERREN
Sent:  Monday, September 01, 2014 12:21 AM
To: Radsafe
Subject: [ RadSafe ]  Astrophysicists Report Radioactive Cobalt in 
Supernova  Explosion

http://mipt.ru/en/news/astrophysicists_report_radioactive_cobalt_in_supernov
a_explosion

Astrophysicists  Report Radioactive Cobalt in Supernova Explosion

Roy  Herren
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