The worker's effective dose (ET) is equal to the dose from external radiation (HP(10)) plus the dose from internal radiation (I) plus the dose from radon (Rnd). The dose from external radiation (HP(10)) was recorded as 30 millisieverts. The internal dose component (I) was calculated to be 7.3 millisieverts. The radon dose component (Rnd) was calculated to be 5 millisieverts. The sum of these three dose components, the worker's total effective dose (ET), is 42.3 millisieverts.