The Radioactivity of Thorium Incandescent Gas Lantern Mantles
The use of thorium in providing the intense white luminescence emitted from gas mantles, has a history of some 130 years, the initial application pre-dating by several decades large-scale urban electric lighting. Accordingly, the thoriated gas mantle has proved itself to be of enormous utility, rema...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/3/1311 |
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| author | Halmat Jalal Hassan Suhairul Hashim Mohamad Syazwan Mohd Sanusi David Andrew Bradley Abdullah Alsubaie Rafael Garcia Tenorio Noor Fitriah Bakri Rozman Mohd Tahar |
| author_facet | Halmat Jalal Hassan Suhairul Hashim Mohamad Syazwan Mohd Sanusi David Andrew Bradley Abdullah Alsubaie Rafael Garcia Tenorio Noor Fitriah Bakri Rozman Mohd Tahar |
| author_sort | Halmat Jalal Hassan |
| collection | DOAJ |
| description | The use of thorium in providing the intense white luminescence emitted from gas mantles, has a history of some 130 years, the initial application pre-dating by several decades large-scale urban electric lighting. Accordingly, the thoriated gas mantle has proved itself to be of enormous utility, remaining popular in more rural areas well into the 20th century, continuing to enjoy use in campsites and street night markets lanterns until today. The discovery of thorium in 1828 preceded the discovery of radioactivity, with subsequent little appreciation initially of any potential harm from exposure to radioactivity. Study has been made herein of small quantities of five different types of the thoriated gas mantle, all purchased online devoid of any control measures. Several approaches were used concerning the <sup>232</sup>Th activity and dose consequence. First, the activity of <sup>232</sup>Th was estimated using an HPGe detector, with sample M5 providing the greatest activity at 1.25 × 10<sup>4</sup> Bq, exceeding the exemption limit for thorium in a mantle. Compared to sample M5, samples M1 to M4 were low in radioactivity, from 5.1 ± 1.31 to 16.33 ± 1.92 Bq. Moreover, the thorium content in M5 constituted 50% of the mantle mass, somewhat greater than previous literature values. The dose equivalent rate on the surface of a single M5 mantle was found to be 0.68 µSv/h, while at the surface of a pack of six the level was 1.9 µSv/h. Monte Carlo simulation codes have been used to obtain organ equivalent and effective dose rates, the greatest close contact (10 cm) exposure to an unlit mantle being to the thymus, at 0.68 µSv/h and 0.62 µSv/h for a male and female phantom respectively. Accordingly, with packages of thoriated gas mantles potentially giving rise to non-negligible equivalent doses, greater incorporation of controls on the sale of such items in national radiation protection legislation would seem worthy of consideration. |
| first_indexed | 2024-03-09T06:12:24Z |
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| language | English |
| last_indexed | 2024-03-09T06:12:24Z |
| publishDate | 2021-02-01 |
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| spelling | doaj.art-2f283879aa4241b985a4423a02796d582023-12-03T11:56:15ZengMDPI AGApplied Sciences2076-34172021-02-01113131110.3390/app11031311The Radioactivity of Thorium Incandescent Gas Lantern MantlesHalmat Jalal Hassan0Suhairul Hashim1Mohamad Syazwan Mohd Sanusi2David Andrew Bradley3Abdullah Alsubaie4Rafael Garcia Tenorio5Noor Fitriah Bakri6Rozman Mohd Tahar7Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Johor 81310, MalaysiaDepartment of Physics, Faculty of Science, Universiti Teknologi Malaysia, Johor 81310, MalaysiaDepartment of Physics, Faculty of Science, Universiti Teknologi Malaysia, Johor 81310, MalaysiaCentre for Applied Physics and Radiation Technologies, Sunway University, Selangor 47500, MalaysiaDepartment of Physics, Taif University, P.O. Box 11099, Taif 21944, Saudi ArabiaDepartment of Applied Physics II, ETSA, University of Seville, 41003 Seville, SpainAtomic Energy Licensing Board, Selangor 43800, MalaysiaAtomic Energy Licensing Board, Selangor 43800, MalaysiaThe use of thorium in providing the intense white luminescence emitted from gas mantles, has a history of some 130 years, the initial application pre-dating by several decades large-scale urban electric lighting. Accordingly, the thoriated gas mantle has proved itself to be of enormous utility, remaining popular in more rural areas well into the 20th century, continuing to enjoy use in campsites and street night markets lanterns until today. The discovery of thorium in 1828 preceded the discovery of radioactivity, with subsequent little appreciation initially of any potential harm from exposure to radioactivity. Study has been made herein of small quantities of five different types of the thoriated gas mantle, all purchased online devoid of any control measures. Several approaches were used concerning the <sup>232</sup>Th activity and dose consequence. First, the activity of <sup>232</sup>Th was estimated using an HPGe detector, with sample M5 providing the greatest activity at 1.25 × 10<sup>4</sup> Bq, exceeding the exemption limit for thorium in a mantle. Compared to sample M5, samples M1 to M4 were low in radioactivity, from 5.1 ± 1.31 to 16.33 ± 1.92 Bq. Moreover, the thorium content in M5 constituted 50% of the mantle mass, somewhat greater than previous literature values. The dose equivalent rate on the surface of a single M5 mantle was found to be 0.68 µSv/h, while at the surface of a pack of six the level was 1.9 µSv/h. Monte Carlo simulation codes have been used to obtain organ equivalent and effective dose rates, the greatest close contact (10 cm) exposure to an unlit mantle being to the thymus, at 0.68 µSv/h and 0.62 µSv/h for a male and female phantom respectively. Accordingly, with packages of thoriated gas mantles potentially giving rise to non-negligible equivalent doses, greater incorporation of controls on the sale of such items in national radiation protection legislation would seem worthy of consideration.https://www.mdpi.com/2076-3417/11/3/1311gas lantern mantleradioactive consumer productsMonte Carlo simulation |
| spellingShingle | Halmat Jalal Hassan Suhairul Hashim Mohamad Syazwan Mohd Sanusi David Andrew Bradley Abdullah Alsubaie Rafael Garcia Tenorio Noor Fitriah Bakri Rozman Mohd Tahar The Radioactivity of Thorium Incandescent Gas Lantern Mantles Applied Sciences gas lantern mantle radioactive consumer products Monte Carlo simulation |
| title | The Radioactivity of Thorium Incandescent Gas Lantern Mantles |
| title_full | The Radioactivity of Thorium Incandescent Gas Lantern Mantles |
| title_fullStr | The Radioactivity of Thorium Incandescent Gas Lantern Mantles |
| title_full_unstemmed | The Radioactivity of Thorium Incandescent Gas Lantern Mantles |
| title_short | The Radioactivity of Thorium Incandescent Gas Lantern Mantles |
| title_sort | radioactivity of thorium incandescent gas lantern mantles |
| topic | gas lantern mantle radioactive consumer products Monte Carlo simulation |
| url | https://www.mdpi.com/2076-3417/11/3/1311 |
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