Elastic scattering - Revision history

Burgjeff at 00:57, 29 January 2016

2016-01-29T00:57:34Z

← Older revision		Revision as of 00:57, 29 January 2016
Line 1:		Line 1:
	[[Single thorium target]]		[[Single thorium target]]
	[[Neutron ~~Pinball~~]]
			[[Neutron pinball]]

Burgjeff: Replaced content with "Single thorium target Neutron Pinball Go back JB Analysis"

2016-01-29T00:57:11Z

Replaced content with "Single thorium target Neutron Pinball Go back JB Analysis"

← Older revision		Revision as of 00:57, 29 January 2016
Line 1:		Line 1:
	[[Single thorium target]]		[[Single thorium target]]
	~~==The simulation==~~		[[Neutron Pinball]]
	Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.

	[[~~File:Fig1.png\|350 px~~]]

	~~==Thorium-232==~~
	With a target radius of 3.1 mm, 8.2% of total simulated neutrons did scatter in the target (at least once), while the remaining 91.8% passed through freely. Out of all the neutrons that did scatter, 96% did so at an angle greater than 10 degrees. Because of the high tendency of neutrons to scatter at sharp angles, this analysis considers all neutrons that scatter as ''contaminated'' data. Below is the distribution of the angle of deflection for all the neutrons that did scatter for a target radius of 3.1 mm.

	~~[[File:Theta.png\|750px]]~~

	Below and left is a plot of the total cross section of Th-232. To the right is the simulated percent contamination for a target radius of 3.1 mm. At this radius, an MCNP F4 tally gave an average neutron track length (within the target) of 3.7 mm. The simulated percent contamination matches very closely with the probability of interaction calculated from the total cross section and average track length. All simulated neutrons are included in this plot, i.e. neutrons are not thrown away if they are traveling towards the ground or ceiling.

	~~[[File:Crosssection-contam2.png\|900px]]~~




	~~Below shows the percent contamination vs target radius for various different energy intervals. The energy of the neutron after it exits the target is the energy used for this data.~~


	~~[[File:Contamination.png\|900 px]]~~

Burgjeff at 00:56, 29 January 2016

2016-01-29T00:56:09Z

← Older revision		Revision as of 00:56, 29 January 2016
Line 1:		Line 1:
	[Single thorium target]		[[Single thorium target]]
	==The simulation==		==The simulation==
	Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.		Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.

Burgjeff at 00:55, 29 January 2016

2016-01-29T00:55:28Z

← Older revision		Revision as of 00:55, 29 January 2016
Line 1:		Line 1:
			[Single thorium target]
	==The simulation==		==The simulation==
	Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.		Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.

Burgjeff: /* The simulation */

2015-12-23T06:46:21Z

The simulation

← Older revision		Revision as of 06:46, 23 December 2015
Line 1:		Line 1:
	==The simulation==		==The simulation==
	Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated.		Neutrons are generated uniformly within a cylindrical target with an energy sampled from a Watt fission spectrum. The angle between the direction that the neutron is traveling at birth and upon exiting the target volume is calculated. The picture below illustrates this angle. The arrows are neutron trajectories, and the dots at the beginning of the trajectories represent the location where the neutron was generated. Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.

	[[File:Fig1.png\|350 px]]		[[File:Fig1.png\|350 px]]

	~~Neutrons that exit the target on a trajectory which will not intersect with a detector are not counted, e.g. neutrons going towards the ceiling or the ground.~~

	==Thorium-232==		==Thorium-232==

Burgjeff: /* Thorium-232 */

2015-12-23T04:24:01Z

Thorium-232

← Older revision		Revision as of 04:24, 23 December 2015
Line 11:		Line 11:
	[[File:Theta.png\|750px]]		[[File:Theta.png\|750px]]

	Below and ~~to the~~ left is a plot of the total cross section of Th-232. To the right is the simulated percent contamination for a target radius of 3.1 mm. At this radius, an MCNP F4 tally gave an average neutron track length (within the target) of 3.7 mm. The simulated percent contamination matches very closely with the probability of interaction calculated from the total cross section and average track length. All simulated neutrons are included in this plot, i.e. neutrons are not thrown away if they are traveling towards the ground or ceiling.		Below and left is a plot of the total cross section of Th-232. To the right is the simulated percent contamination for a target radius of 3.1 mm. At this radius, an MCNP F4 tally gave an average neutron track length (within the target) of 3.7 mm. The simulated percent contamination matches very closely with the probability of interaction calculated from the total cross section and average track length. All simulated neutrons are included in this plot, i.e. neutrons are not thrown away if they are traveling towards the ground or ceiling.

	[[File:Crosssection-contam2.png\|900px]]		[[File:Crosssection-contam2.png\|900px]]

Burgjeff: /* Thorium-232 */

2015-12-23T04:22:32Z

Thorium-232

← Older revision		Revision as of 04:22, 23 December 2015
Line 14:		Line 14:

	[[File:Crosssection-contam2.png\|900px]]		[[File:Crosssection-contam2.png\|900px]]




	Below shows the percent contamination vs target radius for various different energy intervals. The energy of the neutron after it exits the target is the energy used for this data.		Below shows the percent contamination vs target radius for various different energy intervals. The energy of the neutron after it exits the target is the energy used for this data.

Burgjeff: /* Thorium-232 */

2015-12-23T04:16:18Z

Thorium-232

← Older revision		Revision as of 04:16, 23 December 2015
Line 15:		Line 15:
	[[File:Crosssection-contam2.png\|900px]]		[[File:Crosssection-contam2.png\|900px]]

	Below shows the percent contamination vs target radius for various different energy intervals. The energy of the neutron ~~once~~ it exits the target is the energy used for this data.		Below shows the percent contamination vs target radius for various different energy intervals. The energy of the neutron after it exits the target is the energy used for this data.

Burgjeff: /* Thorium-232 */

2015-12-23T04:13:48Z

Thorium-232

← Older revision		Revision as of 04:13, 23 December 2015
Line 11:		Line 11:
	[[File:Theta.png\|750px]]		[[File:Theta.png\|750px]]

	Below and to the left is a plot of the total cross section of Th-232. To the right is the simulated percent contamination for a target radius of 3.1 mm. At this radius an MCNP F4 tally gave an average neutron track length within the target of 3.7 mm. The simulated percent contamination matches very closely with the probability of interaction calculated from the total cross section and average track length. All simulated neutrons are included in this plot, i.e. neutrons are not thrown away if they are traveling towards the ground or ceiling.		Below and to the left is a plot of the total cross section of Th-232. To the right is the simulated percent contamination for a target radius of 3.1 mm. At this radius, an MCNP F4 tally gave an average neutron track length (within the target) of 3.7 mm. The simulated percent contamination matches very closely with the probability of interaction calculated from the total cross section and average track length. All simulated neutrons are included in this plot, i.e. neutrons are not thrown away if they are traveling towards the ground or ceiling.

	[[File:Crosssection-contam2.png\|900px]]		[[File:Crosssection-contam2.png\|900px]]

Burgjeff: /* Thorium-232 */

2015-12-23T04:12:54Z

Thorium-232

← Older revision		Revision as of 04:12, 23 December 2015
Line 7:		Line 7:

	==Thorium-232==		==Thorium-232==
	With a target radius of 3.1 mm, 8.2% of total simulated neutrons did scatter in the target (at least once), while the remaining 91.8% passed through freely. Out of all the neutrons that did scatter, 96% did so at an angle greater than 10 degrees. Because of the high tendency of neutrons to scatter at sharp angles, this analysis considers all neutrons that scatter as ''contaminated'' data. Below is the distribution of the angle of deflection for all the neutrons that did scatter ~~with~~ a target radius of 3.1 mm.		With a target radius of 3.1 mm, 8.2% of total simulated neutrons did scatter in the target (at least once), while the remaining 91.8% passed through freely. Out of all the neutrons that did scatter, 96% did so at an angle greater than 10 degrees. Because of the high tendency of neutrons to scatter at sharp angles, this analysis considers all neutrons that scatter as ''contaminated'' data. Below is the distribution of the angle of deflection for all the neutrons that did scatter for a target radius of 3.1 mm.

	[[File:Theta.png\|750px]]		[[File:Theta.png\|750px]]