View source for DeepBlueMarin 04222013

Irradiation of Silver coins from Deep Blue Marin performed on April 22, 2013

=Large Coin=

==Raw Spectrum==
[[File:04222013_LargeCoin_Raw.png | 200 px]]

==Calibration==


{| border="3"  cellpadding="5" cellspacing="0"
| [[File:04222013_LargeCoin_Cal.png | 200 px]]||[[File:04222013_LargeCoin_RawMainPeak.png | 200 px]] || [[File:04222013_LargeCoin_CalMainPeak.png | 200 px]]
|-
| Linear fit using several sources  ||  Zoom in to the most intense line || The most intense line seems to be from positron annihilation
|}


==Energy Calibrated spectrum==

[[File:04222013_LargeCoin_EnergySpectrum.png | 200 px]]


===Peak Ratios===

Ratio of 511 and

;Silver lines

{| border="3"  cellpadding="5" cellspacing="0"
| Coin Size|| 511/451 ratio || 511/748 ratio|| 511/1046 ratio
|-
| Large  ||  87740/6639 =13.2|| 87740/2962=29.6 || 87740/2803 = 31.3
|-
| Medium  || 31950/2938 =10.9 || 31950/1239 =25.8|| 31950/1283=24.9
|-
| Small  || 87090/8184=10.6 || 87090/3790 =22.98|| 87090/3578=24.34
|}


;Gold lines

Consider the neutron knock out reaction on Gold 

<math>{197 \atop\; }Au (\gamma,n){196 \atop \; }Au</math>

Au-196 decays with a half life 6.183 days of by electron capture to Platinum (Pt-196) 92% of the time.

There are two dominant photon energies of 333.03 keV and 355.73 keV.  67% of the time Au-196 goes to the 2+ excited state of Pt-196 after  34.15 ps .  24.7%  of the time it decays to the next higher energy 2+  state of Pt-196  after 33.8 ps and then proceeds to emitt a 333.03 keV photon as it transitions to the lower 2+ state where it will emitt a 355.73 keV photon on its way to the ground state.

The spectra below show a clear peak at a photon energy of 356 keV but the signal at 333 keV is less convincing.  The peak fit near the 333 keV energy has a Guassian mean of 332.   Perhaps there are two different photon energies in the 33 keV region, one at 332 and the other at 333.5.

[[File:GoldLinesS333_04222013.png| 200 px]]

{| border="3"  cellpadding="5" cellspacing="0"
| Coin Size|| 333 keV || 356 keV || 333/356 ratio 
|-
| Large  ||  [[File:L333_04222013.png| 200 px]] || [[File:L356_04222013.png| 200 px]] || 5397/3672=1.47
|-
| Medium  ||  [[File:M333_04222013.png| 200 px]] || [[File:M356_04222013.png| 200 px]] || 2062/1432=1.44 
|-
| Small  ||  [[File:S333_04222013.png| 200 px]] || [[File:S356_04222013.png| 200 px]] || 5552/3956 =1.40 
|}

==Rate normalized spectrum==


=Missing Peaks=

All three coins were irradiated for 1 hour on 4/22/2013 starting at 11:19 am.

The photon spectrum was measured separately for each coin 5 hours after the activation.

The Large coin spectrum was measured on 4/22/2013 from 17:07:34 until 17:19:17. (livetime = 657.476 second)

The Medium coin on the same day 4/22/2013 from 17:20:50 until 17:37:18. (livetime = 298.611 second)

The small coin on the same day from 17:38 until 17:53:09. (lifetime = 823.458)



==388 keV line==

A  657 second measurement at  17:07 on 4/22/2013 (irradiation was done from 11:19 until 12:19 the same day)

The Large coin has a line at 388 keV but the small or medium does not.

[[File:388_04222013.png| 200 px]]

A 141453 second measurement performed 19 days later on 5/11/2013.

[[File:511_05112013.png| 200 px]][[File:388_05112013.png| 200 px]][[File:Zoomed388_05112013.png| 200 px]]

Possible Isotope that produce this line are

Ce-135(17.7 hr) ,Sr-87m(2.8 hr), Y-87(79.8 hr), Hg-195m (41.6 hr)

==1365 keV line ? ==

The Large coin has a line at 1365 keV but the small or medium does not.

[[File:1365_04222013.png| 200 px]]

Possible Isotope that produce this line are


Os-179


[[PAA_DeepBlueMarine]]