Artificial UV Radiation Profile

RADIATION  KNOWN CARCINOGEN (IARC 1)

IARC Monograph Vol. 100D, 2012 (Group 1)
IARC Monograph Vol. 118, 2017 (Group 1) – pending

Artificial UV Radiation Profile

QUICK SUMMARY

  • Radiation emitted by artificial sources, found between visible light and x-rays on the electromagnetic spectrum
  • Associated cancers: Skin cancer, ocular melanoma
  • Most important routes of exposure: Skin or eye contact
  • Uses: Electric welding arcs, curing lamps to harden resins and paints, germicidal lamps for sterilization, lasers, tanning beds, and in medical and dental practices
  • Occupational exposures: Approx. 141,000 Canadians workers are exposed at work, primarily welders, medical laboratory technologists, pathologists’ assistants, and sheet metal workers
  • Environmental exposures: Indoor tanning facilities
  • Fast fact: Between 2011-2016, all ten Canadian provinces and one territory (NT) passed legislation to ban tanning bed use by minors under the age of 18 or 19.

General Information

On the electromagnetic spectrum, ultraviolet radiation (UVR) is found between visible light and x-rays. It is divided into three components: UV-A (315-400 nm), UV-B (280-315 nm) and UV-C (100-280 nm).[1,2] Studies show that UV-C is the most genotoxic of the three components, while UV-A is the least.[2] Artificial sources of UVR emit a range of wavelengths specific to each source.[3] Artificial UVR may be used in occupational settings (medicine, industry, business and research) as well as for cosmetic and domestic purposes (sunlamps and sunbeds).[3] Welding arcs and UV lasers are also sources of artificial UVR.[4]

UVR with wavelengths in the range of 100 to 400 nanometres (nm; including UVA, UVB, and UVC), including UV-emitting tanning devices and UVR from welding, have been classified by the International Agency for Research on Cancer (IARC) as Group 1, known human carcinogens.[5,6] There is sufficient evidence that artificial tanning devices cause skin and ocular melanoma; the risk of developing melanoma was prominently and consistently increased in people who first used the equipment in their twenties or teen years.[3] There is also sufficient evidence that UVR exposure from arc welding increases the risk of ocular melanoma.[6] Fluorescent lights also emit UVR.[2] Studies examining the relationship between melanoma of the skin and exposure to fluorescent lights at work have produced conflicting results and fluorescent lights were classified by IARC as Group 3, not classifiable as to its carcinogenicity to humans.[1,7]

As with solar UVR, exposure to artificial UVR may result in short term skin damage such as burning, fragility, and scarring; in addition to carcinogenic effects, long term exposures may break down collagen and decrease skin elasticity.[8] Data suggest that using indoor tanning facilities may produce detrimental effects on the skin’s immune response.[3] Using certain prescription drugs or exposure to industrial chemicals such as coal tar distillates may cause hypersensitivity to UVR.[4] Fair skinned individuals are at greater risk of adverse outcomes following UVR exposure.[9] UVR generated from arc welding can cause various eye disorders, such as cataracts or keratoconjunctivitis, in both welders and nearby workers.[6]

Regulations and Guidelines

Occupational Exposure Limits (OEL)

The American Conference of Governmental Industrial Hygienists (ACGIH) recognizes ultraviolet radiation as an occupational hazard and recommends different exposure threshold limit values (TLVs) for different UVR wavelengths in air between 180 and 400 nanometres.[10] The recommended TLVs published in 2015 are shown in the figure below.

 

J/m2 = Joules per square metre

Canadian Regulations and Guidelines

Regulation/guideline Year
Radiation Emitting Devices Act 1985[11]
Regulation Amendment: Radiation Emitting Devices Regulations (Tanning Equipment) 2005[12]
Skin Cancer Prevention (Artificial Tanning) Act (AB) 2018[13]
Guidelines for Tanning Salon Owners, Operators and Users 2014[14]
Food and Drugs Act: Medical Devices Regulations 1998[15]
The Public Health Amendment Act (Prohibiting Children’s Use of Tanning Equipment and Other Amendments) (MB) 2016[16]
Tanning Beds Act (NS) 2010[17]
Artificial Tanning Act (NB) 2013[18]
Radiological Health Protection Act (NB) 1992[19]
Radiation Health and Safety Regulations (SK) 2005[20]
Guidelines for Tanning Salon Operators (BC) 1997, 2004[21]
Skin Cancer Prevention Act (Tanning Beds) (ON) 2013[22]
Personal Services Act (NL) 2014[23]
Act to Prevent Skin Cancer Caused by Artificial Tanning (QC) 2013[24]

Main Sources of Artificial UVR

Electric welding arcs can produce significant levels of UVR within a radius of several metres; gas welding and cutting torches do not produce high levels of UVR.[4]

Artificial UVR is used in medical and dental practices for procedures such as treating skin diseases and neonatal jaundice, detecting and treating cavities, and managing chronic conditions such as seasonal affective disorder (SAD) and sleep disorders.[3]

Curing lamps emit intense artificial UVR to harden resins and dry paints; these processes are usually enclosed but openings in the enclosure may lead to overexposure.[4] Germicidal lamps, commonly used to sterilize materials in hospitals, are strong emitters of UV-B and UV-C radiation.[4] Halogen, xenon, and metal halide lamps can emit artificial UVR; however, black lights, incandescent, and fluorescent lamps do not generally present a high exposure risk.[4] Ultraviolet lasers, which emit a single invisible wavelength of UVR, are used industrially and medically.[4]

Environmental Exposures Overview

Cosmetic tanning appliances, which may be referred to as sunbeds, sunlamps, or tanning beds, are the main source of artificial UVR exposure for the general public.[1,3] Estimates show that powerful tanning units may emit UVR with an intensity 10-15 times greater than that of the midday sun.[3,25]

Current tanning appliances primarily emit UV-A radiation,[1,26] although recently tanning lamps have been manufactured to produce higher levels of UV-B in order to mimic the solar spectrum and speed up the tanning process.[6,27] Indoor tanning facilities are most commonly used by younger women (17-21 years) in North America.[28]

The Canadian Cancer Society has endorsed the World Health Organization’s recommendation that no person under 18 should use artificial tanning equipment.[29] Between 2011 and 2016, all ten Canadian provinces and one territory (NT) have passed legislation to ban the use of tanning beds for minors under the age of 18 or 19.[30,31,32,23,33,34,35,22,36,24,37]

Occupational Exposures Overview

Exposure to UVR may be dermal or ocular.

CAREX Canada estimates that approximately 141,000 Canadians are likely exposed to artificial UV radiation in their workplaces. The largest industrial groups exposed are commercial and industrial machinery repair (i.e. welding), and personal care services (i.e. tanning and nail salons). The largest occupational groups exposed include welders, followed by medical laboratory technologists and pathologists’ assistants, and sheet metal workers.

Other occupations with potential for exposure to artificial UVR include tanning appliance operators, as well as workers in industrial photo-processes, sterilization and disinfection (sewage effluents, drinking water, swimming pools, operating rooms and research laboratories), non-destructive testing, printing, phototherapy, UV photography, UV lasers, food industry quality control, and discotheques.[3,4,38]

Artificial UVR exposure may be mitigated through engineering controls (such as enclosures), however in some applications workers can be exposed by reflection or scattering from adjacent surfaces, a phenomenon that is particularly concerning for tanning appliance operators.[3]

For more information, see the occupational exposure estimate for UV radiation.

Sources

1. International Agency for Research on Cancer (IARC). Monograph summary, Volume 55 (1992) (PDF)
2. National Toxicology Program (NTP). 14th Report on Carcinogens for Ultraviolet Radiation Related Exposures (2016) (PDF)
3. International Agency for Research on Cancer (IARC). Exposure to Artificial UV Radiation and Skin Cancer, Working Group Report (2005) (PDF)
4. Ontario Ministry of Labour. Ultraviolet Radiation in the Workplace (Revised March 2009)
5. International Agency for Research on Cancer (IARC). Monograph summary, Volume 100 Part D (2012) (PDF)
6. Guha N, Loomis D, Guyton KZ, Grosse Y, El Ghissassi F, Bouvard V, Benbrahim-Tallaa, Vilahur N, Muller K, Straif K. “International Agency for Research on Cancer Monograph Working Group. Carcinogenicity of welding, molybdenum trioxide, and indium tin oxide” Lancet Oncol 2017;18(4).
7. International Agency for Research on Cancer (IARC). Complete List of Agents evaluated and their classification (2006) (PDF)
8. World Health Organization (WHO). Protection Against Exposure to Ultraviolet Radiation (1994) (PDF)
9. Health Canada. It’s Your Health: Tanning Lamps (2003) (PDF)
10. Association Advancing Occupational and Environmental Health (ACGIH). ACGIH Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) (2012) (PDF)
13. Province of Alberta.Skin Cancer Prevention (Artificial Tanning) Act (2018) (PDF)
17. Minister of Health Promotion and Protection. An Act to Regulate Tanning Beds (2010) (PDF)
18. Government of New Brunswick. Artificial Tanning Act (2010) (PDF)
19. The Canadian Legal Information Institute (CanLII). Government of New Brunswick, Radiological Health Protection Act (O.C. 92-84) (1992)
20. Government of Saskatchewan. The Radiation Health and Safety Regulations (2005) (PDF)
21. BC Ministry of Health Services. Guidelines for Tanning Salon Operators (1997; revised 2004) (PDF)
22. Government of Ontario. Skin Cancer Prevention Act (Tanning Beds) (2014)
23. Government of Newfoundland and Labrador. Bill 27, An Act to Regulate the Personal Services Industry (2012)
26. Government of Quebec. Tanning (2016)
27. Indoor Tanning Working Group. Report of the Indoor tanning Working Group (2011) (PDF)
28. Panning C, Smith A, Spohn O, van Wesenbeeck L. “Characterizing the risk of melanoma and use of indoor tanning beds in high-risk groups to inform public health regulations.” Environmental Health Review 2016;59(1):30-34.
29. Canadian Cancer Society. Indoor Tanning (2018)
33. Government of New Brunswick. Bill 54, Artificial Tanning Act (2013) (PDF)
34. Government of Northwest Territories. Public Health Act, Personal Service Establishment Regulations (2013) (PDF)
35. Government of Nova Scotia. Bill 102, An Act to Regulate Tanning Beds (2015)
36. Government of Prince Edward Island. Bill 6, Public Health Act (2012) (PDF)
37. Government of Saskatchewan. Health Hazard Regulations amendment (2015) (PDF)
38. Canadian Centre for Occupational Health and Safety. Ultraviolet Radiation (2016)

Other Resources

  1. European Union. Scientific Committee on Consumer Products (SCCP) Opinion on Biological effects of ultraviolet radiation relevant to health with particular reference to sunbeds for cosmetic purposes (2006) (PDF)
  2. Health Canada. Frequently Asked Questions on the Radiation Emitting Devices Regulations (Tanning Equipment) (2007)

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