[ RadSafe ] Easy radiation quiz.

Geo>K0FF GEOelectronics at netscape.com
Thu Dec 20 19:40:37 CST 2007

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.


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
 Choose from:




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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