Table 6 Estimated number of US X-ray users (with standard deviation). Standard deviation reflects Chapman’s uncertainty only, total uncertainty is larger (Appendix 2)
From: Early X-ray workers: an effort to assess their numbers, risk, and most common (skin) affliction
1900 | 1901 | 1902 | 1903 | |
|---|---|---|---|---|
From ARRS-members (sd) | 268 (58) | 382 (78) | 536 (89) | 609 (94) |