Se PAA Reactions - Revision history

Starvale at 16:57, 23 February 2018

2018-02-23T16:57:39Z

2018-02-23T16:56:54Z

2018-02-23T16:54:57Z

2018-02-23T16:52:38Z

2017-05-26T16:20:36Z

Neutron knockout of Se-76

2017-04-26T23:07:22Z

Activity Productions

2017-04-26T23:05:13Z

Activity Productions

2017-04-26T23:04:16Z

Activity Productions

2017-04-26T23:02:21Z

Activity Productions

2017-04-26T23:01:28Z

Activity Productions

@@ Line 2: / Line 2: @@
 ==Single and double particle knockout reactions==
-[[File:TableOfReactions.jpg]|600px]
+[[File:TableOfReactions.jpg|600px]]
 ==Neutron knockout of Se-82==
 If you knock a neutron out of Se-82 you produce the unstable isotope Se-81 which Beta emitts with half life of 18.45 min and a meta-state that emmits a 103 keV gamma with a 57.28 minute half life.

@@ Line 2: / Line 2: @@
 ==Single and double particle knockout reactions==
-[[File:TableOfReactions.jpg]]
+[[File:TableOfReactions.jpg]|600px]
 ==Neutron knockout of Se-82==
 If you knock a neutron out of Se-82 you produce the unstable isotope Se-81 which Beta emitts with half life of 18.45 min and a meta-state that emmits a 103 keV gamma with a 57.28 minute half life.

@@ Line 2: / Line 2: @@
 ==Single and double particle knockout reactions==
-[[File:TableOfReactions.pdf]]
+[[File:TableOfReactions.jpg]]
 ==Neutron knockout of Se-82==
 If you knock a neutron out of Se-82 you produce the unstable isotope Se-81 which Beta emitts with half life of 18.45 min and a meta-state that emmits a 103 keV gamma with a 57.28 minute half life.

@@ Line 1: / Line 1: @@
 [[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]
 ==Neutron knockout of Se-82==
 If you knock a neutron out of Se-82 you produce the unstable isotope Se-81 which Beta emitts with half life of 18.45 min and a meta-state that emmits a 103 keV gamma with a 57.28 minute half life.

@@ Line 24: / Line 24: @@
 <math>{76 \atop\; 34}Se (\gamma,n){75 \atop \; }Se</math>
-The prominent photons emitted have the following energies
+The prominent photons emitted have the following energies in order of high to low intensity
 , 264, and 279 keV

← Older revision		Revision as of 23:07, 26 April 2017
Line 286:		Line 286:

	<math>N= n_T V_T \int \sigma \phi dE</math>		<math>N= n_T V_T \int \sigma \phi dE</math>
		+
		+	<math>n_T</math> is the number of target nucleii per volume, <math>V_T</math> is the amount of volume irradiated
		+
		+
		+	Our goal will be to determine <math>n_T</math>
		+
		+	One can use Nickel as a normalization target to remove the photon flux <math>(\phi)</math> from the integral leaving just an integral over the cross section.

	[[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]		[[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]

@@ Line 283: / Line 283: @@
 :<math>\Rightarrow N(t) = \frac{N \sigma \phi}{\lambda}\left ( 1 - e^{-\lambda t} \right )</math>
-The number of target uncle, N, may be cast in terms of the
+The number of target uncle, N, is determine using
 [[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]

@@ Line 279: / Line 279: @@
 Although the investigation of provenance will involve a comparison of isotope ratios,  one will need to determine the detection limit of measuring each of those isotopes.
+The amount of activated nucleii, N(t), is governed by the production rate equation below.
 :<math>\Rightarrow N(t) = \frac{N \sigma \phi}{\lambda}\left ( 1 - e^{-\lambda t} \right )</math>
 [[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]

← Older revision		Revision as of 23:02, 26 April 2017
Line 276:		Line 276:
	===Activity Productions===		===Activity Productions===

		+
		+	Although the investigation of provenance will involve a comparison of isotope ratios, one will need to determine the detection limit of measuring each of those isotopes.

← Older revision		Revision as of 23:01, 26 April 2017
Line 274:		Line 274:

	<math>\frac{N_{Se-79}}{N_{Se-75}} = \left ( \frac{\sigma_{Se-79}}{\sigma_{Se-75} }\right ) \left ( \frac{\lambda_{Se-75}}{\lambda_{Se-79}}\right ) = \left ( \frac{100}{15} \right ) \left ( \frac{119}{10^8} \right ) </math>		<math>\frac{N_{Se-79}}{N_{Se-75}} = \left ( \frac{\sigma_{Se-79}}{\sigma_{Se-75} }\right ) \left ( \frac{\lambda_{Se-75}}{\lambda_{Se-79}}\right ) = \left ( \frac{100}{15} \right ) \left ( \frac{119}{10^8} \right ) </math>
		+	===Activity Productions===
		+
		+
		+
		+	The rate of activated nuclei production is estimated by subtracting the rate of decay from the rate of production
		+
		+	<math>\frac{dN(t)}{dt} = N \sigma \phi - \lambda N(t)</math>
		+
		+	where
		+
		+	<math>\lambda</math> = half life of activated nucleus
		+
		+	:<math>\Rightarrow N(t) = \frac{N \sigma \phi}{\lambda}\left ( 1 - e^{-\lambda t} \right )</math>
		+

	[[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]		[[PAA_Selenium#Can_one_perform_PAA_measurements_of_Se-82_and_Se-76.3F]]