[ RadSafe ] 477 keV gamma in PWR RCS sample

[Franta, Jaroslav]

UNRESTRICTED | ILLIMITÉ

How about antimony ?

124Sb has a gamma at 0.477 MeV

Antimony is not an uncommon problem at NPPs, due to the material being used in some PHT pump components.

Please let us know your eventual positive ID.

Jaro
^^^^^^^^^^^^^^^^^^^^


-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
Behalf Of McGrath, Jack
Sent: June 5, 2009 1:05 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] 477 keV gamma in PWR RCS sample


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=670466>

476.38 15

0.030 7

169Lu<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=710169>

476.40 5

0.0000015 5

186Re<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=750186>

476.49 5

0.023 3

205Bi<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=830205>

476.67 20

0.00010 2

115mCd<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=480415>

476.8 1

42.0 8

144Pm<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=610144>

476.827 6

0.32 4

200Tl<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=810200>

476.89 13

0.018 5

150Eu<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=630150>

477.0 6

0.009 6

153Tb<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=650153>

477.1 3

0.065 19

228Pa<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=910228>

477.2

0.00012

253Es<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=990253>

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=610151>

477.791 23

0.401 14

165Tm<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=690165>

477.8 3

1.82 21

190Ir<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=770190>

477.99 2

15

188Ir<http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=770188>




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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