Fission fragment trasport out of U-233 - Revision history

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T02:05:23Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T02:02:39Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T02:01:14Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T01:56:35Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T01:54:55Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T01:51:30Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-29T01:47:40Z

Probability of a fission fragment to create a signal

Abdehait: /* Probability of a fission fragment to create a signal */

2013-08-26T23:14:23Z

Probability of a fission fragment to create a signal

Abdehait: /* U-233 Coating */

2013-08-26T23:06:51Z

U-233 Coating

Abdehait: /* U-233 Coating */

2013-08-26T22:56:06Z

U-233 Coating

← Older revision		Revision as of 02:05, 29 August 2013
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	<references/>		<references/>
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		+	GO BACK [https://wiki.iac.isu.edu/index.php/Performance_of_THGEM_as_a_Neutron_Detector#Problem_Statement]

← Older revision		Revision as of 02:02, 29 August 2013
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−	Producing free electrons in the gas will consequently create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the ~~fissin~~ fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref> , separating the electrons from the higher energy ones that are scattered freely from a fission fragment's ionization is beyond the scope of this research.	+	Producing free electrons in the gas will consequently create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the fission fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref> , separating the electrons from the higher energy ones that are scattered freely from a fission fragment's ionization is beyond the scope of this research.

← Older revision		Revision as of 02:01, 29 August 2013
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−	Producing free electrons in the gas will consequently create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the fissin fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref>	+	Producing free electrons in the gas will consequently create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the fissin fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref> , separating the electrons from the higher energy ones that are scattered freely from a fission fragment's ionization is beyond the scope of this research.

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 <math> Probability = \frac{d}{4\pi r^2 R} </math>
-The following figure shows the probability values for 40 um and 20 um coating thickess of U-233, the highest probability for a fission fragment to escape to the gas when the fission event creates within 1-3 um from the coating surface.
+The following figure shows the probability values for 40 um and 20 um coating thickess of U-233, the highest probability for a fission fragment to escape to the gas when the fission event creates it within 1 um from the coating surface.
 [[File:ff_esc_prob_hudler_2008.png |200px]]

@@ Line 24: / Line 24: @@
 <math> Probability = \frac{d}{4\pi r^2 R} </math>
-The following figure shows the probability values for 40 um and 20 um coating thickess of U-233.
+The following figure shows the probability values for 40 um and 20 um coating thickess of U-233, the highest probability for a fission fragment to escape to the gas when the fission event creates within 1-3 um from the coating surface.
 [[File:ff_esc_prob_hudler_2008.png |200px]]

← Older revision		Revision as of 01:51, 29 August 2013
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	<math> Probability = \frac{d}{4\pi r^2 R} </math>		<math> Probability = \frac{d}{4\pi r^2 R} </math>

		+	The following figure shows the probability values for 40 um and 20 um coating thickess of U-233.
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		+	[[File:ff_esc_prob_hudler_2008.png \|200px]]

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 =Probability of a fission fragment to create a signal=
-U-233 is relatively sensitive  but the coating thickness may stop the fission fragments. Compared to the other neutron sensitive targets, U-233 is relatively sensitive to a wide energy range of neutrons, the range may extend from 0.1 MeV to more than 30 MeV. However, coating thickness determines the if a fission fragment can escape from its surface and to cause an ionization in the gas to create a signal. The range of a fission fragment is calculated in UO3, of thickness 0.1 um and density 7.29 g/cm^3, is 12.07 +_ 0.09 um, <ref name = Hudler> J.C. hadler, Radiation Measurements Vol 43 (2008) pf S334-S336</ref> assuming the fission fragment mobility is the same as the UO3. As the thickness increases more than 0.1 um, the range will decrease according to the following equation <ref name = Hudler/> :
+U-233 is relatively sensitive  but the coating thickness may stop the fission fragments. Compared to the other neutron sensitive targets, U-233 is relatively sensitive to a wide energy range of incident neutrons, the range may extend from 0.1 MeV to more than 30 MeV. However, the coating thickness determines if a fission fragment can escape from its surface and to cause an ionization. The range of a fission fragment is calculated in UO3, of thickness 0.1 um and density 7.29 g/cm^3, is 12.07 +_ 0.09 um, <ref name = Hudler> J.C. hadler, Radiation Measurements Vol 43 (2008) pf S334-S336</ref> assuming the fission fragment mobility is the same as the UO3. As the thickness increases more than 0.1 um, the range will decrease according to the following equation <ref name = Hudler/> :
 <math> R= R_T - <r> </math>
 <math> <r> = \frac{ln(d/R_T) + 0.5}{ 2/d (1-R_T/d) + R_T^{-1}} </math>

← Older revision		Revision as of 23:14, 26 August 2013
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−	Producing free electrons in the gas will ~~concequienty~~ create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the fissin fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref>	+	Producing free electrons in the gas will consequently create a signal. Although the fission fragment leaves the surface of U-233 coating and ionizes the gas, but minimum 200 electrons of energy around 20 eV become free through the fissin fragment's track in the U-233 coating of thickness 1-10um. <ref name = Wang> Wang Jin et al, Applied Physics Letters, Vol 82, 20 (2003) pf 3553-3555</ref>

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 =U-233 Coating=
-The fission chamber has a fissionable material as a sensitive neutron target. The fission chambers have usually target material that make them sensitive for neutrons, them most commonly used material for detecting thermal neutron is U-235, in case of fast neutron Th-232 or U-238 represent good target. in some cases the fission chamber may contain more than one target to detect a wide range of emitted neutrons.<ref name= "Andriamonje"> Novel Micromegas Detector for In-Core Nuclear Reactor Neutron Flux Measurements </ref>
+The fission chamber has a fissionable material as a neutron sensitive target. The fission chambers have usually target material that make them sensitive for neutrons that belongs to an energy range, the most commonly used material for detecting thermal neutron is U-235, in case of fast neutron Th-232 and U-238 represent good target. In some cases the fission chamber may contain more than one target to detect a wide range of emitted neutrons.<ref name= "Andriamonje"> Novel Micromegas Detector for In-Core Nuclear Reactor Neutron Flux Measurements </ref>
-In this research, the neutron sensitive material used in the fission chamber is Uranium 233. U-233 has a relatively high neutron fission cross section in the energy range of 0.1-30 MeV as shown in the figure below.
+In this research, the neutron sensitive material used in the fission chamber is Uranium 233(U-233). U-233 has a relatively high neutron fission cross section in the energy range of 0.1-30 MeV as shown in the figure below.
 [[File:U-233_fissionxsection_0.01-100MeV.gif |200px]]
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 [[File:U-233_fissionxsection_fullenergyrange.gif |200px]]
-The coating on a circular metal plate which is connected to the cathode. The coating of U-233 has a cirular shape of an inch in diameter and 20-40 um in thickness. The circular plate is glued to a square  FR4 copper clad plate of length of 12 cm and thickness of 1 mm, the plate has a hole of 4 cm in diameter that keeps the U-233 coating exposed to the chamber gas.
+The coating is on a circular metal plate which is in a direct contact to the cathode. The coating of U-233 has a circular shape of an inch in diameter and 20-40 um in thickness. The U-233 circular plate is glued to a square  FR4 copper clad plate of length of 12 cm and thickness of 1 mm (cathode), the plate has a hole of 4 cm in diameter that keeps the U-233 coating exposed to the chamber gas.
 =Probability of a fission fragment to create a signal=