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

2. 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 April 2002

3. 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 April 2002

4. 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 April 2002

5. 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 April 2002

6. 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 April 2002

7. 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 April 2002

8. 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 April 2002

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

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