Lens redioactivity - measurements
Actinometry of old lenses
| Lens | Result | Comment |
| Yashinon 1:1.8 f=5.5cm | 81nSv/h | too old for this problem? |
Yashinon-DX 28mm 1:2.8
| 210nSv/h | |
Yashinon-DX 50mm 1:1.4
| 81nSv/h | |
Yashinon-DX 50mm 1:1.7
| 84nSv/h | (Version with chrome ring) |
| Yashinon-DX 50mm 1:1.7 | 84nSv/h | (black version)
|
Yashinon-DX 50mm 1:2
| 66nSv/h | (chrome version) |
Yashinon 55mm 1:1.2
| 981nSv/h | * |
Yashinon-DS 50mm 1:1.4
| 680nSv/h | |
Yashinon-DS 28mm 1:2.8
| 86nSv/h | |
Yashinon-DS 50mm 1:1.7
| 762nSv/h | |
| Yashinon-DS 50mm 1:1.9 | 76nSv/h | |
Yashinon-DS 50mm 1:2
| 95nSv/h | |
Yashinon DS-M 28mm 1:2.8
| 80nSv/h | a surprise as it's a winde angle lens - maybe too recent or the new 8/7 formula works without special glass |
Yashinon DS-M 50mm 1:1.4
| 572nSv/h | |
Yashinon DS-M 50mm 1:1.7
| 798nSv/h | |
Yashinon DS-M 55mm 1:1.2
| 1056nSv/h | * |
Yashinon DS-M 1:4 200mm
| 86nSv/h | as expected: a tele lens doesn't need glass with high refractive index |
Yashikor 28mm 1:2.8
| 80nSv/h | |
Yashica DSB 28mm 1:2.8
| 82nSv/h | |
Yashica DSB 50mm 1:1.9
| 81nSv/h | |
Yashica ML 50mm 1:1.4
| 83nSv/h
| |
| Yashica ML 50mm 1:2 | 81nSv/h
| |
Porst MC 1:2,8/28mm H
| 79nSv/h
| |
RMC Tokina 24mm 1:2.8
| 83nSv/h
| |
Super-Takumar 55mm 1:2
| 380nSv/h
| it's not only Yashica ... |
Topcon UV Topcor 50mm 1:2
| 283nSv/h
| *
|
Remark I : the mesurement has been carried out directly behind the rear element - result is without substraction of natural radiation.
Remark II : this is by no means to be understood as a scientific report :-)
Reference for the amount of natural radiation: Jährlicher Bericht 2004 gemäß Strahlenschutzvorsorgegesetz ("German yearly report as orderd by Radiation Protection Preacution Law")
This page is continuously updated with new results
(Last update: 3.7.07 - 21:01 MESZ)
