Years ago I was shooting bowling pins indoors and it was recommended that i have a blood test because after each session would sweep up with a mask. Well low and behold my count was 63. Went through all the tests and chelation therapy was out. Had to take a year off and was checked every month and with each test it was going down. Half life in blood if I remember correctly is 30+ days.
It is a special test that requires a specific tube for the blood draw. Think the glass is lead free.
Anyway get checked and you will have a benchmark to go by.
Jon