Experimental check of bremsstrahlung dosimetry predictions for 0. 75 MeV electrons

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5467963

Sanford, T W.L.; Halbleib, J A; Beezhold, W

Bremsstrahlung dose in CaF/sub 2/ TLDs from the radiation produced by 0.75 MeV electrons incident on Ta/C targets is measured and compared with that calculated via the CYLTRAN Monte Carlo code. The comparison was made to validate the code, which is used to predict and analyze radiation environments of flash x-ray simulators measured by TLDs. Over a wide range of Ta target thicknesses and radiation angles the code is found to agree with the 5% measurements. For Ta thickness near those that optimize the radiation output, however, the code overestimates the radiation dose at small angles. Maximum overprediction is about 14 +- 5%. The general agreement, nonetheless, gives confidence in using the code at this energy and in the TLD calibration procedure. For the bulk of the measurements, a standard TLD employing a 2.2 mm thick Al equilibrator was used. In this paper we also show that this thickness can significantly attenuate the free-field dose and introduces significant photon buildup in the equilibrator. 17 refs., 9 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5467963
• Report Number(s): SAND-85-0357C; CONF-850711-10; ON: DE85014706
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BREMSSTRAHLUNG
COMPARATIVE EVALUATIONS
COMPUTER CODES
DOSIMETRY
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
LEPTONS
METALS
MEV RANGE
MONTE CARLO METHOD
RADIATIONS
TANTALUM
TARGETS
TESTING
THERMOLUMINESCENT DOSIMETRY
TRANSITION ELEMENTS
VALIDATION