Answer:
2 and 3 only
Step-by-step explanation:
A periodic blood count is not recommended as a method for monitoring occupational radiation exposure because:
1. biologic damage from ionizing radiation cannot be determined from a blood test.
2. biologic damage has already been sustained when an irregularity is seen in the blood count.
3. a traditional blood count is a relatively insensitive test that is unable to indicate exposures of less than 10 cGy.