Limits of Exposure to Electromagnetic Waves in The Frequency Range of 9 kHz – 300 GHz
By the team at Zergo November 4, 2021
Reference: NTC TS 5001 – 2550, announced on the 29th day of March B.E. 2550 (2007)
Limits
The standard limits set for exposure to electromagnetic wave in the frequency range of 9 kHz – 300 GHz based on the limits indicated in the document on ICNIRP Guidelines for Limiting Exposure to Time-varying Electric, Magnetic and Electromagnetic Fields (Up to 300 GHz), 1998 edition, worked out and released by International Commission on Non-Ionizing Radiation Protection (ICNIRP), as below:
1. Exposure limits to electromagnetic radiation from radiocommunication equipment, of which the radiation component is, in normal use, positioned close to the user’s head, or less than 20 centimeters from the body of the user
The SAR in the frequency range of 100 kHz-10 GHz for occupational exposure group and general public exposure group shall not exceed the following:
1) SAR for occupational exposure group
| SAR (W/kg) | |
|---|---|
| Average SAR for the whole body | 0.4 |
| Average SAR for the head and trunk | 10 |
| Average SAR for the limbs | 20 |
2) SAR for general public exposure group
| SAR (W/kg) | |
|---|---|
| Average SAR for the whole body | 0.08 |
| Average SAR for the head and trunk | 2 |
| Average SAR for the limbs | 4 |
Notes:
1. The SAR shown above is the 6-minute average of the SAR assessed.
2. The SAR for the whole body is a division result of the total power of the body absorption and the total body mass.
3. The SAR for the specific parts of the body is an average per 10 gram mass of the tissue of the same parts in cubic shape.
2. Exposure limits to electromagnetic radiation from wireless communication transmission equipment, of which the radiation component is, in normal use, positioned at least 20 centimeters from the human body, and that in fixed location and with broad area of electromagnetic radiation
Limits of electromagnetic field strength for occupational exposure group and general public exposure group shall not be over exceed the following:
1) Limits of electromagnetic field strength for occupational exposure group
| SAR (W/kg) | |
|---|---|
| Average SAR for the whole body | 0.08 |
| Average SAR for the head and trunk | 2 |
| Average SAR for the limbs | 4 |
2) Limits of electromagnetic field strength for general public exposure group
| Frequency range | E-field strength (V/m) | H-field strength (A/m) | Equivalent plane wave power density Seq (W/m2) |
|---|---|---|---|
| 93 kHz-65 kHz | 87 | 5 | – |
| 65 kHz-1 MHz | 87 | 0.73/ƒ | – |
| 1 MHz-10 MHz | 87/ƒ1/2 | 0.73/ƒ | – |
| 10 MHz-400 MHz | 28 | 0.073 | 2 |
| 400 MHz-2 GHz | 1.375ƒ1/2 | 0.0037ƒ1/2 | ƒ/200 |
| 2 GHz-300 GHz | 61 | 0.16 | 10 |
Notes:
1. E-field strength is electric field strength, measured in voltage per meter (V/m).
2. H-field strength is magnetic field strength, measured in ampere per meter (A/m).
3. ƒ refers to frequency, measured in MHz
4. For frequency range of 100 kHz-10 GHz, the Seq, E2 and H2 shown are the average of those in certain 6-minute periods.
5. For frequency over 10 GHz, the Seq, E2 and H2 shown are the average of those in certain periods of 68 / ƒ1.05 minutes, where ƒ refers to frequency measured in GHz.