SELECT COUNT("Calculated activity ( Bq )") FROM table_28433 WHERE "Specimen weight/size" = '1000 g / 8.79 cm'
If the specimen weight/size is 1000 g / 8.79 cm, what is the calculated activity?
CREATE TABLE table_28433 (
    "Specimen weight/size" text,
    "Calculated activity ( Bq )" real,
    "Calculated activity ( Ci )" text,
    "Estimated activity GR(api)" text,
    "Estimated exposure ( mRem )/hr*" text
)