Situational tasks

1. The children of the kindergarten age receive the erythemal dose approximately per 1 minute after exposure to 10 LE-30 lamps at standard distance of 0.5 m from beacon irradiator. What is the preventive dose for a child at the distance of 2.5 m from the source? (the closest possible distance to locate 25 children around the source)

2. Photarium is equipped with the LE-30 erythemal lamps in bilateral rows at a distance 1.5 m from rank of miners. The erythematoues dose for a few miners at the distance 0.5 m from one row of the lamps is 1.5 minutes. As a doctor of community health department calculate the exposure time for the preventive UV irradiation of the miners in phorarium.

3. The erythemal dose for most patients of cardiac department at a standard distance of 0.5 m is 0.5 minute. What an exposure distance for the preventive UV irradiation from beacon irradiator with direct mercury-quartz lamp will be for a group of those patients?

4. The UV radiation power of beacon irradiator with 10 lamps LE-30 at a distance 1 meter measured by uphymeter is 100 . The lamps generate 297 – 300 nm UV wave-length. What is a power of the UVR in and in preventive doses?

5. The trial air sanation using the Krotov device has found 8 000 befor and 3 800 after it. What is the exposure time for the sanation of the air in the operating room using one LB-30 lamp?