Comprehensive Assessment of Health Impacts from Exposure to Nonionizing Radiation for Healthcare Practitioners Working with MRI and Ultrasound

Table 3

The levels of occupational hazards at the workplaces of the ophthalmologist.

Indicators		Dimension	n	Mean ± m	Min–Max	Standard deviation	TLV	Percentage of exceeding	Mean/TLV
The 3rd group—ophthalmologists
Noise		dBA	27	44.1 ± 2.0	17.5–57.9	10.2	50	33.3	0.9
Ultrasound (kHz)	12.5	dB	27	14.0 ± 0.7	9.7–30.4	3.8	80	0	0.2
	16		27	10.9 ± 0.8	0–27.5	4.6	90	0	0.1
	20		27	9.4 ± 0.9	0–24.6	4.9	100	0	0.1
	25		27	8.1 ± 0.9	0–25.3	4.8	105	0	0.1
	31.5		27	6.7 ± 0.9	0–26.3	4.8	110	0	0.1
EMF (50 Hz)		Electric (kV/m)	27	0.3 ± 0.03	0.08–0.47	0.13	0.5	0	0.5
		Magnetic (A/m)	27	0.5 ± 0.05	0.1–1.3	0.2	4	0	0.1
CMF		Strength (kА/m)	27	0.14 ± 0.02	0.01–0.42	0.09	8	0	0.02
		Magnetic induction (mT)	27	0.15 ± 0.01	0.047–0.28	0.07	10	0	0.01
EMF of RF		Electric field (V/m)	27	1.63 ± 0.46	0.46–13.47	2.42	80	0	0.02
		Magnetic field (А/m)	27	0.46 ± 0.06	0.13–1.67	0.32	3	0	0.15
EMF (5–2,000 Hz)		Electric field (V/m)	27	5.57 ± 0.87	0.67–13.38	4.5	25	0	0.2
		Magnetic field (nT)	27	82.3 ± 5.8	7.4–118.7	30.1	250	0	0.3
EMF (2–400 kHz)		Electric field (V/m)	27	0.8 ± 0.06	0.43–1.49	0.33	2.5	0	0.3
		Magnetic field (nT)	27	3.0 ± 0.7	0.7–18.2	3.8	25	0	0.1
Electrostatic field		kV/m	27	0.1 ± 0.01	0.01–0.26	0.06	20	0	0.005