Absolute determination of bremsstrahlung deposition (Hydra)
A technique developed to measure electron energy deposition in metals has been applied to the determination of bremmstrahlung deposition. In this method a square-wave beam modulation is employed and the time-derivative of a calorimeter temperature is used to obtain the energy deposited. This paper presents the results of bremsstrahlung deposition measurements in gold and aluminum. Data are presented for dose to a material as a function of converter material, converter thickness, and angle of electron incidence for electron energies in the range from 0.2 to 1.0 MeV. In addition, measurements of dose as a function of calorimeter position as it was moved both laterally and axially with respect to the beam axis are reported. Utilizing the facility and technique developed to make these measurements, a thorough study of the bremsstrahlung measuring calorimeters used with the pulsed electron beam machine Hydra was accomplished. The goal of this study was to determine accurately the correction factor for the loading effect of the thermocouple wires. The loading correction factor was measured to be 1.72 with an uncertainty of +- 5 percent. This value should be used when determining true dose to gold with the standard Hydra calorimeters instead of the value of 1.5 obtained from data on Hydra, since there is a larger uncertainty in the latter value.
- Research Organization:
- Sandia Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- AT(29-1)-789
- NSA Number:
- NSA-32-021342
- OSTI ID:
- 4168928
- Report Number(s):
- SAND--75-0005
- Country of Publication:
- United States
- Language:
- English
Similar Records
Bremsstrahlung convertors: materials design and development
DARHT Axis 1 Bremsstrahlung Dose Measurements