Simulation of Transmission and Attenuation of Photons in a Labyrinth
- SLAC
Neutrons travel through tunnels and ducts (labyrinths) according to curves that are universally applicable, regardless of labyrinth geometry or particle energy. Photons were believed to follow this manner, but this has been found not to be the case. Photons transmit through labyrinths with a definite functional dependence upon both particle energy and labyrinth geometry. In the first leg of a two-legged labyrinth, photons attenuate according to the function: Dose = 1/1 + A {center_dot} x{sup 2}. In the second leg, photons attenuate according to the function: Dose = 1/1 + B {center_dot} x{sup 3} in which A and B are functions of energy and labyrinth geometry, and x is a dimensionless unit of d/sqrt(a) in which d is the distance from the labyrinth mouth and a is the cross-sectional area. Dose is an attenuation factor. The A and B values have not been analyzed sufficiently to determine their functional dependence upon energy and cross-sectional area, however they have been tabularized which allows for interpolation of the data for use in calculations. These results were determined by simulating a mono-energetic beam incident upon a two-legged labyrinth with angular spread to cover the mouth. Work was begun on utilizing a real spectrum to determine a functional dependence by placing an iron target at the mouth of the labyrinth, and striking it with an electron beam. However, the techniques used to gather the mono-energetic beam data were not sufficient to effectively gather a complete set of real spectrum data and analyze its functionality.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515;
- OSTI ID:
- 833119
- Report Number(s):
- SLAC-TN-04-065
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiation measurements in a labyrinth penetration at a high-energy proton accelerator
An Approximate Method for Evaluating Neutron Punch Through in Certain Classes of Shielding Penetrations
Measurement and calculation of doses in and around north-west labyrinth in TFTR test cell shielding for D-T operation
Journal Article
·
Thu Oct 31 23:00:00 EST 1985
· Health Phys.; (United States)
·
OSTI ID:5744435
An Approximate Method for Evaluating Neutron Punch Through in Certain Classes of Shielding Penetrations
Technical Report
·
Tue Jan 11 23:00:00 EST 1994
·
OSTI ID:1119189
Measurement and calculation of doses in and around north-west labyrinth in TFTR test cell shielding for D-T operation
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:505936