Re: Sr-90 RTG power

["Tom O'Dou" <todou@cabreraservices.com>]

http://www.qrg.northwestern.edu/projects/vss/docs/Power/3-what-are-the-fuels

-for-rtgs.html



indicates a thermal output of 0.93 W/gram for Sr-90 and provides a

comparison of different generator types.



Tom O'Dou



----- Original Message -----

From: "Phil Hypes" <laradcon@HOTMAIL.COM>

To: <Jack_Earley@RL.GOV>; <radsafe@list.vanderbilt.edu>

Sent: Tuesday, January 08, 2002 12:06 PM

Subject: Sr-90 RTG power





> Jack,

>

> One of my colleagues in the calorimetry section of my group at LANL

> calculated a maximum power of 2.3 Watts/gram for Sr90 in equilibrium with

> it's daughters.  That figure was based on maximum Q values, so I divided

by

> 3 for a rough average value.  That gives a specific power of about 0.77

> Watts/gram.  The specific power of Sr90 is 141 Ci/g (from the 1970 RHH,

the

> only copy I have at hand), so the power per unit activity should be

0.00546

> Watts/Ci.  A 40,000 Ci source would therefore produce about 220 Watts of

> power.  That's a lot of power; it's enough to make me ask if anyone can

find

> any errors in what I've done above.

>

> Phil Hypes

>

>

> >From: Jack_Earley@RL.GOV

> >Reply-To: Jack_Earley@RL.GOV

> >To: radsafe@list.vanderbilt.edu

> >Subject: RE: From AP and AOL about Sr-90 exposure of lumberjacks in

Georgi

> >a

> >Date: Tue, 8 Jan 2002 08:58:35 -0800

> >

> >Several people have discussed these lost and found RTGs w/ me privately,

> >and

> >a couple have expressed an interest in the power level produced by one of

> >these w/ 40K Ci of Sr-90. Anyone have a ballpark idea?

> >

> >Jack Earley

> >Radiological Engineer

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