Define 3.6 Meaning

"What does the dosimeter say?"
"3.6 Roentgen. But that's ...."
"3.6 Roentgen. Not great, not terrible".-Comrade Dyatlov

"Hey, how are you?"
"well, kind of fine I guess..."
"what do you mean, 'kind of' fine ?"
"3.6 roentgen."

Therapist: How is your social life going?
Me: Well, I would rate it about 3.6
Therapist: 3.6 out of 5? Not great, not terrible!
Me: 3.6 out of 15000