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Monitoring of occupational workers for possible internal radioactive contamination, is an important part of a comprehensive radiological surveillance programme. Body Burden Measurement (BBM) and Bioassay and Biokinetics (BB) Sections of the Health Physics Division (HPD) BARC, are responsible for carrying out internal contamination monitoring of occupational workers at BARC, Trombay using in-vivo (direct) and/or in-vitro (indirect) measurements as applicable. Direct measurement techniques viz. whole body counting, thyroid counting and lung counting are used, to estimate internal contamination due to fission products, activation products and actinides that emit x or g ray photons. In the indirect method, urine or faeces of the occupational worker is analyzed, to determine excretion rate from the body of internally deposited radionuclides, which are pure b or a emitters. Results of both the measurements are …