calibration of scintillation crystals for air kerma rate castle
TRANSCRIPT
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CALIBRATION OF SCINTILLATION CRYSTALS FOR AIR KERMA RATE
Loch Castle, Scott Muston, Stephen Marks and Dr Stephen [email protected]
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DETECTOR BASICS
Scintillation Crystal PMT MCA
GPS
PC
INTEGRATED ARPANSA GAMMA MAPPING SYSTEM (AGMS)
N
E
γ
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SOFTWARE INTERFACE
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MAPPING PRODUCTS
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SCINTILLATION CRYSTAL TYPES
1x4 inch LaBr
(Lanthanum Bromide)
6x4 inch NaI
(Sodium Iodide)
4x4x16 inch NaI
(Sodium Iodide)
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CONTRIBUTING RADIATION COMPONENTS
TERRESTRIAL
COSMIC
INTERNAL CONTAMINATIONSOURCE
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DOSE RATE – AIR KERMA RELATIONSHIP
ii ENDdetDdet(Absorbed Dose in Detector)
Air Kerma Kair(Absorbed Dose in Air) nnn
nnair
ENwENwENwDwDwDwK
......
222111
2211
1keV = 1.6 x 10‐16J
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ENERGY RESPONSE
SCINT
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REGIONS OF INTEREST
SCINT
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SOURCES COVERING THE REGIONS OF INTEREST
241Am 57Co 137Cs133Ba 60Co
SCINT
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LINKING SOURCE AIR KERMA RATES
Source Air Kerma Rate Γδ(uGy.m-2.GBq-1.h-1)
241Am 3.58957Co 13.074133Ba 47.178137Cs 75.86160Co 306.400
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SHADOW‐SHIELD TECHNIQUE
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RESIDUAL PHOTOPEAK RELATES TO AIR KERMA RATE
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ORIGINAL SETUP BY GRASTY ET AL
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ARPANSA SETUP
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SOLVING CALIBRATION COEFFICIENTS
wn = nGy.h-1/keV.s-1
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AIR KERMA RATE COEFFICIENTS
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TERRESTRIAL MEASUREMENTS
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CARI‐6 COSMIC MEASUREMENTS
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COSMIC SPECTRA
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INTERNAL CONTAMINATION
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INTERNAL CONTAMINATION
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COMPONENT AIR KERMA RATES
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CORRECTION FACTORS
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CONFIRMATION OF RESULTS
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END RESULT
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QUESTIONS
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PHOTOS
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PHOTOS
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PHOTOS