It is fine Berylium particles that are toxic. These get lodged in the lungs and will cause berylliosis a chronique lung disease. Small dosages appear to be sufficient to cause the disease, i.e. exposure to concentrations in the range of 1mg/m3 of air.
This is a serious issue in the mining at metals industries where the beryllium is mixed in trace amounts with other less toxics dusts.
As for exposure to a cantilever made of beryllium, I would not worry.
This is a serious issue in the mining at metals industries where the beryllium is mixed in trace amounts with other less toxics dusts.
As for exposure to a cantilever made of beryllium, I would not worry.