Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
if the estimated exposure ( mrem )/hr* is 0.28, what is the specimen weight/size?

### Inputs:
table_name: table, columns: ['Specimen weight/size', 'Calculated activity ( Bq )', 'Calculated activity ( Ci )', 'Estimated activity GR(api)', 'Estimated exposure ( mRem )/hr*']

### Response:
SELECT COUNT Specimen weight/size FROM table WHERE Estimated exposure ( mRem )/hr* = 0.28