Re: Sr-90 RTG power

[Brian Rees <brees@LANL.GOV>]

Nuclides and Isotopes (GE, 14th ed.) gives 0.916 W/g.  Specific Activity of 

136.5 Ci/g (RHH 3rd ed.) => 268 W - looks good enough!



Brian Rees





At 11:06 AM 1/8/2002 -0700, Phil Hypes wrote:

>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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