[ RadSafe ] 477 keV gamma in PWR RCS sample

[StevenFrey at aol.com]

Please pardon if you already have thought of this possibility: It  might be 
the Compton Edge 'photopeak' from Cs-137 in that particular  sample.
 
Steve Frey
 
 
 
 
In a message dated 6/5/2009 1:12:54 P.M. Eastern Daylight Time,  
Jack.McGrath at constellation.com writes:

Dear  all,

We have recently upgraded our gamma spectroscopy detectors to 45  percent 
germanium detectors.  We are performing analysis on our reactor  coolant 
samples, and are observing a photopeak at 477 keV.

This sample  was analyzed 4 days after sampling to remove short-lived 
interfering  nuclides.

I have ruled out single, double escape and summation  peaks

The following isotopes have been ruled out due to the absence of  
confirmatory lines.

E* (keV)

I* (%)

Parent

476.37  4

0.0363  22

166mHo<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=6704
66>

476.38  15

0.030  7

169Lu<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=71016
9>

476.40  5

0.0000015  5

186Re<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=75018
6>

476.49  5

0.023  3

205Bi<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=83020
5>

476.67  20

0.00010  2

115mCd<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=4804
15>

476.8  1

42.0  8

144Pm<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=61014
4>

476.827  6

0.32  4

200Tl<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=81020
0>

476.89  13

0.018  5

150Eu<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=63015
0>

477.0  6

0.009  6

153Tb<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=65015
3>

477.1  3

0.065  19

228Pa<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=91022
8>

477.2

0.00012

253Es<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=99025
3>

477.7  4

0.013  5

95Tc<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=430095
>

477.75  4

0.094  9

151Pm<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=61015
1>

477.791  23

0.401  14

165Tm<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=69016
5>

477.8  3

1.82  21

190Ir<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=77019
0>

477.99  2

15

188Ir<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=77018
8>




Does  anyone have suggestions as to what the 477 kev is coming  from?

Thanks!

Jack McGrath
Sr. Chemist
Ginna  Station
Jack.McGrath at Constellation.com

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