Alternatives to Chest-Xray?

Hey all I’ll cut to the chase:

I’ve been hired by a Japanese company and the contract includes the yearly Chest-Xray for tuberculosis.

I don’t want to get into it, but i’ve had a good chunk of radiation already back home. I’ve been advised by doctors not to get any more unless necessary.

I come for a country not on the required list for Japan’s TB screening.

Can I not just ask the doctor for the blood test for TB instead? Info online isn’t clear.

Thanks!