Safety assessment of laser projector radiation for the population

Introduction. The target organs of laser radiation include the skin and the organ of vision. The danger of laser beams for the visual analyzer determined the main direction of research in this area, which focused on the study of the damaging effect of radiation on the organ of vision.

The aim of the study is a hygienic assessment of laser radiation from projectors used in cultural events.

Materials and methods. Measurements were carried out on 10 multi-color projectors with capacities from 2 to 30 watts belonging to 2 classes: Kvant and Spectrum and wavelengths of 445–460 nm, 520–532 nm, and 637–640 nm with a tuned projection system at a distance of 7 m from the scanning system.

Results. Analysis of the data obtained showed that, with the exception of the blue spectral region for Kvant 2000 and 3000 projectors, there is an excess of the maximum permissible levels at all wavelengths for all projectors. The greatest exceedances were detected 7–11 times at a wavelength of 532 nm, 8 times at a wavelength of 637 nm.

Limitations. The study was conducted on a limited number of projectors, and the remote control was calculated only for the time of the flashing reflex, which limits the possibilities of a broader interpretation of the data obtained.

Conclusion. The probability of exceeding the maximum permissible levels of laser radiation at the available capacities jeopardizes the safety of the event for both visitors and actors and projector operators. This issue requires a deeper study of protective measures at all levels: both organizational and household.

Compliance with ethical standards. Studies on humans and animals have not been conducted, the study does not require the submission of the opinion of the biomedical ethics committee or other documents.

Contribution:
Malkova N.Yu. — the concept and design of the study, collection and processing of material, statistical processing, writing a text, editing;
Petrova M.D. — collection and processing of material, writing a text.
All authors are responsible for the integrity of all parts of the manuscript and approval of the manuscript final version. 

Conflict of interest. The authors declare no conflict of interest. 

Acknowledgement. The study had no sponsorship. 

Received: May 17, 2022 / Accepted: August 04, 2022 / Published: September 14, 2022