G. Valtchev, L.Dimitrov, M. Neshkova

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Presentation transcript:

G. Valtchev, L.Dimitrov, M. Neshkova 3rd EC/ISOE WORKSHOP ON OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’S PORTOROZ, 17-19 APRIL 2002 DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY G. Valtchev, L.Dimitrov, M. Neshkova

INTERNAL DOSE ASSESSMENT DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY INTRODUCTION INTERNAL DOSE ASSESSMENT THE SOFTWARE “DOSEART” 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY INTRODUCTION Internal dose cannot be measured directly - What is whole body counting for? -The most convenient and rapid method for determining the amount of radioactivity in body - WBC- system? – Accuscan scanning bed position, Canberra type - Uptakes via inhalation - Routine monitoring - Regularly repeated measurements - Special monitoring – Before and after particular task - Unknown time of intake – questioning and investigation - Appropriate software to help the Health physicist 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

INTERNAL DOSE ASSESSMENT DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY INTERNAL DOSE ASSESSMENT If positive measurement – a lot of questions: - is it internal or/and external contamination? - when did it happened? - any intakes before the actual one? - what is the size and size distribution of the aerosols? - what could be the chemical form? - other workers on the same place and task? 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

INTERNAL DOSE ASSESSMENT DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY INTERNAL DOSE ASSESSMENT Estimation of the dose from the measured activity is based on the biokinetic behavior of a particular radionuclide  biokinetic models: - accumulation of activity in special organs; - retention of radionuclides; - transport of radionuclides between organs; - removal of radionuclides by excretion and radioactive decay; Individual metabolism may significantly differ from Reference Man: - Investigation phase User –friendly software is needed for different inputs data in order to calculate and compare output results 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

THE SOFTWARE “DOSEART” DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY THE SOFTWARE “DOSEART” - Designed to meet KNPP’s requirement - Verified against LUDEP 2.07 - Specific features: - time for input and calculation very short; - taking into account previous intakes; - easy to see and change all input data / parameters; - estimation of multiple, continuous and acute intakes; - new lung model; - modes for special and routine monitoring; - presentation of intakes, doses, percentages of ALI; 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

THE SOFTWARE “DOSEART” DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY THE SOFTWARE “DOSEART” - Estimation of intake – based on tabulated intake retention fractions ( IRF) for selected radionuclides; - IRF calculated in advance by IRF software, using the new lung model ( ICRP Publication 66); - Calculation of doses – based on dose coefficients as in BSS 115 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

THE SOFTWARE “DOSEART” DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY THE SOFTWARE “DOSEART” INPUT DATA: - radionuclide selection; - class selection; - AMAD ( 1 or 5 m); - activity or area and dimension; - routine or special monitoring; - date of intakes; - measurement time; - personal data; - type of intake ( acute, multiple, continuous); - comment’s window; 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002

DOSE ASSESSMENTS FROM WHOLE-BODY MEASUREMENTS - THE APPROACH AT NPP KOZLODUY 3rd EC/ISOE WORKSHOP on OCCUPATIONAL EXPOSURE MANAGEMENT AT NPP’s Portoroz 17-19 April 2002