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ASSESSMENT OF LOW-LEVEL CONTAMINATION FROM GAMMA-EMITTING RADIONUCLIDES

Objective

THE OBJECTIVE OF THIS RESEARCH PROGRAMME IS TO EVALUATE A NEW ANALYTICAL TECHNIQUE THAT SHOULD IMPROVE THE PRECISION OF THE INTERFERENCES THAT CAN BE MADE ABOUT RADIONUCLIDE ACTIVITY FROM AREA MEASUREMENTS OF SMALL-AREA SPECTRAL PEAKS OBTAINED USING MULTI-CHANNEL SPECTROMETRY.

THESE IMPROVEMENTS ARE BASED ON THE APPLICATION OF BAYESIAN PEAK FITTING, A METHOD OF PEAK FITTING THAT ALLOWS THE INFORMATION CONTAINED IN A SPECTRUM TO BE USED MORE FULLY THAN IS POSSIBLE WITH THE METHOD OF GROSS COUNTING., WHICH IS CURRENTLY EMPLOYED.IT FOLLOWS THAT ACTIVITY ESTIMATES AND CONFIDENCE INTERVALS FOR ACTIVITY SHOULD BE MORE PRECISELY DEFINED, AND THE RESSOURCES REQUIRED TO OBTAIN A SPECIFIED DETECTION LIMIT SHOULD BE REDUCED.

AN ASSESSMENT OF THE EXTENT OF THIS IMPROVEMENT, AND OF WHETHER THIS IMPROVEMENT IS SUFFICIENT TO WARRANT USING THE SLIGHTLY MORE COMPLICATED BAYESIAN APPROACH, IS THE MAIN OBJECTIVE OF THIS RESEARCH PROGRAMME.

B.1. EQUIPMENT PROCUREMENT, INSTALLATION, ACCEPTANCE TESTING AND PLANNING.

B.2. COLLECTION OF SAMPLE SPECTRA AND THE ASSESSMENT OF SPECTRAL INSTABILITY.

B.3. DEVELOPMENT OF BAYESIAN PEAK FITTING AND THE CONSTRUCTION OF BAYESIAN PRIOR DENSITIES.

B.4. SPECTRAL SIMULATION AND PEAK FITTING FOR DIFFERENT VALUES OF PEAK AREA, BACKGROUND LEVEL, AND OTHER RELEVANT PARAMETERS.

B.5. CONSTRUCTION OF A HYPOTHESIS TEST THAT THE PEAK AREA IS ZERO, AND THE DETERMINATION OF ITS PROPERTIES.

B.6. CONSTRUCTION OF AN ESTIMATOR FOR PEAK AREA, AND THE DETERMINATION OF ITS PROPERTIES.

B.7. CONSTRUCTION OF A CONFIDENCE INTERVAL ESTIMATOR FOR PEAK AREA, AND THE DETERMINATION OF ITS PROPERTIES.

B.8. GENERALISATION OF THE HYPOTHESIS TEST TO SEVERAL RADIONUCLIDES.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
Address
South Kensington Campus
London
United Kingdom