[ RadSafe ] Easy radiation quiz.

[StevenFrey at aol.com]

Hi George, by golly, you got that one right. To your credit, you passed  
John's subtle and clever test. At this rate, in ten years or so, you  might 
qualify as having sufficient basic knowledge in this field to be a  credible source. 
 
Now, was the Cs-137/Ba-137m decay chain your only point, or do you  have 
something more substantive for this board to think about?
 
Steve Frey
 
In a message dated 12/20/2007 6:03:17 P.M. Pacific Standard Time,  
GEOelectronics at netscape.com writes:

Ooppps.  Cs-137 decays by Electron Capture? Better hit the books Bob.

Cs-137  decays 100% by beta minus decay, where the nucleus converts a neutron 
into  a proton and ejects a negative beta particle and an anti-neutrino. By  
gaining a proton, the nucleus transmutes to the next highest Z number as  in:
55 Cs 137 + P -N>56 Ba 137m
The Ba-137 then decays by Isomeric  Transition or IT. From this decay we get 
the familiar 661.650 keV (89.9%)  and 32.994 (3.2%) keV Gamma Rays we are so 
fond of.

EC is where an  orbital electron gets captured by a the nucleus and then 
converts a proton  into a neutron and a neutrino. By losing a proton, the Z 
number decreases  by 1.

http://atom.kaeri.re.kr/ton/index.html

I again apologize  to the group for stating the obvious and posting 
information too basic for  this forum.

The instructions were to keep this topic  offline.

George Dowell


----- Original Message -----  
From: "Flood, John" <FloodJR at nv.doe.gov>
To: "Geo>K0FF"  <GEOelectronics at netscape.com>; <radsafe at radlab.nl>
Sent:  Thursday, December 20, 2007 6:04 PM
Subject: RE: [ RadSafe ] Easy radiation  quiz.


OK, silly trick question, trying to get someone to say it's a  gamma
emitter when it decays by electron capture with no gamma to  Ba-137m,
which emits the 662 kev gamma.

What I'd really like to know  is, what's going on here?  Is there now an
entrance exam for  Radsafe?  Have you been appointed proctor for this?
Why do we need to  be quizzed?  Maybe I've gotten cynical in my old age,
but I can't help  but wonder what the goal of all this might be.

John R. (Bob)  Flood
Radiological Health
Nevada Test Site
(702)  295-2514
-----Original Message-----
From: radsafe-bounces at radlab.nl  [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Geo>K0FF
Sent:  Thursday, December 20, 2007 3:20 PM
To: radsafe at radlab.nl
Subject: [  RadSafe ] Easy radiation quiz.

We didn't do too well with our last  quiz. Here is an easier one. This
should be common knowledge, so don't look  it up, just answer off the top
of your head.
No updates, no  clarifications, here are the questions, deal with them as
they  are.

Part 1:
What is the type of nuclear decay in  Cs-137?

What is the type of radiation given off from  Cs-137?

What is the predominant energy in keV of the radiation given  off from
Cs-137?
Choose  from:

662

156.8

1173

if none of the above, list  it.

Remember we are talking about the isotope  Cs-137.


Respond direct to GEOelectronics at netscape.com, not  to  the list

Humor me, Thanks

George  Dowell
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