Hello doctor, I have a question about crystalline silica dust exposure. I am a firefighter, and I decided to make some repairs to my helmet with high heat furnace cement. Over the past week, I have been sanding the repairs. I was unaware of the inhalation danger of silica dust. I have been wearing a R95 mask and have sanded for a total of four times for about 20 to 25 minutes each time. I used a powered Dremel tool for the sanding. Do I need to be concerned about the silica exposure?
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