Experimental characterization of the AFIT neutron facility. Master's thesis

Technical Report · Wed Sep 01 00:00:00 EDT 1993

OSTI ID:5392811

Lessard, O J

AFIT's Neutron Facility was characterized for room-return neutrons using a (252)Cf source and a Bonner sphere spectrometer with three experimental models, the shadow shield, the Eisenhauer, Schwartz, and Johnson (ESJ), and the polynomial models. The free-field fluences at one meter from the ESJ and polynomial models were compared to the equivalent value from the accepted experimental shadow shield model to determine the suitability of the models in the AFIT facility. The polynomial model behaved erratically, as expected, while the ESJ model compared to within 4.8% of the shadow shield model results for the four Bonner sphere calibration. The ratio of total fluence to free-field fluence at one meter for the ESJ model was then compared to the equivalent ratio obtained by a Monte Cario Neutron-Photon transport code (MCNP), an accepted computational model. The ESJ model compared to within 6.2% of the MCNP results. AFIT's fluence ratios were compared to equivalent ratios reported by three other neutron facilities which verified that AFIT's results fit previously published trends based on room volumes. The ESJ model appeared adequate for health physics applications and was chosen was chosen for calibration of the AFIT facility. Neutron Detector, Bonner Sphere, Neutron Dosimetry, Room Characterization.

• Research Organization: Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States)
• OSTI ID: 5392811
• Report Number(s): AD-A-273822/7/XAB; AFIT/GAP/ENP-93D-06
• Resource Relation: Other Information: Master's thesis
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPES AND RADIATION SOURCES
NEUTRON SOURCE FACILITIES
CALIBRATION
NEUTRON DOSIMETRY
BONNER SPHERE SPECTROMETERS
CALIFORNIUM 252
EXPERIMENTAL DATA
MATHEMATICAL MODELS
NEUTRON FLUENCE
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALIFORNIUM ISOTOPES
DATA
DOSIMETRY
EVEN-EVEN NUCLEI
HEAVY NUCLEI
INFORMATION
ISOTOPES
MEASURING INSTRUMENTS
NEUTRON SPECTROMETERS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
SPECTROMETERS
SPONTANEOUS FISSION RADIOISOTOPES
YEARS LIVING RADIOISOTOPES
070207* - Radiation Sources- Radiation Source Metrology- (1992-)
070201 - Radiation Sources- Design
Fabrication & Operation