Glasses suitable for radiation sources of the same type must be classified in the ascending order of their protection factors and the manufacturer's instructions must indicate, in particular, how to select the appropriate PPE taking into account the relevant conditions of use such as the distance from the source and the spectral distribution of the energy radiated at that distance.
Caithfear spéaclaí atá oiriúnach d'fhoinsí radaíochta den chineál céanna a chur in ord ardaitheach de réir a bhfachtóirí cosanta agus ní mór treoracha an mhonaróra a chur in iúl, go háirithe, an tslí chun an TCP iomchuí a roghnú ag tabhairt airde ar na dálaí iomchuí úsáide, mar shampla an t-achar ón bhfoinse agus dáileadh speictreach an fhuinnimh a radaítear ag an achar sin.