Vietnam: Permissible levels of high frequency electromagnetic intensity in the workplace

19:39, 10/07/2024

On June 30, 2016, the Ministry of Health (Hanoi, Vietnam) issued Circular 21/2016/TT-BYT stipulating the National Technical Regulation - High Frequency Electromagnetic - Permissible Exposure Level of High Frequency Electromagnetic Intensity in the Workplace

According to the provisions of Circular 21/2016/TT-BYT, the permissible levels of high frequency electromagnetic intensity in the workplace do not exceed the values specified in the table below:

High-Frequency Electromagnetic Field (1)
Frequency	Electric Field Intensity (E) (V/m)	Magnetic Field Intensity (H) (A/m)	Power Density (P) (W/cm²)	Average Measurement Time (minutes)
3KHz-65KHz	614	24.6	- ⁽²⁾	6
>65KHz-1MHz	614	1.6/f⁽³⁾	- ⁽²⁾	6
>1MHz-10MHz	614/f⁽³⁾	1.6/f⁽³⁾	- ⁽²⁾	6
>10MHz-400MHz	61	0.16	10	6
>400MHz-300GHz	61	0.16	10	6

Notes:

(1) The values of electric field intensity and magnetic field intensity at the workplace may be obtained from average spatial sampling values over an area with nominal dimensions of 30cm x 30cm.

(2) In these frequency ranges, measuring power density in this unit is inappropriate.

(3) f is the frequency in MHz.

More details can be found in Circular 21/2016/TT-BYT which takes effect in Vietnam from December 01, 2016.

- Thanh Lam -

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