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

Table 1

The levels of occupational hazards at the workplaces of MRI specialists.

Indicators		Dimension	n	Mean ± m	Min–Max	Standard deviation	TLV	Percentage of exceeding	Mean/TLV
The 1st group—MRI diagnostics specialists
Noise		dBA	17	48.6 ± 1.5	37.0–64.3	6.3	50	35.3	1.0
Ultrasound (kHz)	12.5	(a) dB	17	24.3 ± 1.3	14.9–30.2	5.5	80	0	0.3
	16		17	19.4 ± 1.6	7.3–29.1	6.7	90	0	0.2
	20		17	13.7 ± 2.4	0.0–36.6	10.0	100	0	0.1
	25		17	10.8 ± 1.9	0.0–29.6	7.7	105	0	0.1
	31.5		17	10.2 ± 1.4	0.0–19.5	5.8	110	0	0.1
EMF (50 Hz)		Electric (kV/m)	17	0.55 ± 0.1	0.08–1.3	0.4	0.5	47.1	1.1
		Magnetic (A/m)	17	0.65 ± 0.07	0.06–1.2	0.3	4	0	0.6
CMF		Strength (kА/m)	17	2.59 ± 1.29	0.04–21.30	5.31	8	5.8	0.3
		Magnetic induction (mT)	17	3.38 ± 1.69	0.05–27.90	6.98	10	5.9	0.3
EMF of RF		Electric field (V/m)	17	4.34 ± 1.05	1.12–16.87	4.32	80	0	0.05
		Magnetic field (А/m)	17	4.02 ± 1.34	0.13–16.23	5.52	3	41.2	1.3
EMF (5–2,000 Hz)		Electric field (V/m)	17	16.45 ± 5.01	5.17–94.10	20.66	25	5.9	0.7
		Magnetic field (nT)	17	107.7 ± 10.1	0.5–155.9	41.7	250	0	0.4
EMF (2–400 kHz)		Electric field (V/m)	17	0.98 ± 0.12	0.50–1.92	0.48	2.5	0	0.4
		Magnetic field (nT)	17	6.3 ± 0.7	1.9–11.5	2.8	25	0	0.2
Electrostatic field		kV/m	17	0.20 ± 0.03	0.02–0.45	0.14	20	0	0.01