TABLE 4. Reconstruction of Workers' Potential Exposures to Agents Specifically Associated With the Diagnosed Cancers Based on Work History*.
| SEG | Line | Duration | Agent‡ | Potential Exposure Level§ | ||
|---|---|---|---|---|---|---|
| Calendar Years | Work Years† | 8h TWA | Cumulative | |||
| Case 1 (operator), diagnosed with AML | ||||||
| Diffusion | D | 1.19 | 1.43 | None | – | – |
| Administrative‖ | D | 0.22 | 0.26 | None | – | – |
| Clean | D | 0.22 | 0.27 | None | – | – |
| Case 2 (operator), diagnosed with AML | ||||||
| Thin-films metal | D | 6.45 | 7.75 | None | – | – |
| CVD | D | 3.00 | 3.60 | None | – | – |
| Administrative‖ | D | 0.75 | 0.89 | None | – | – |
| Clean | D | 0.52 | 0.64 | None | – | – |
| Diffusion | D | 0.58 | 0.69 | None | – | – |
| Case 3 (maintenance), diagnosed with ALL | ||||||
| CMP | A | 5.19 | 6.23 | None | – | – |
| Backlap | C | 2.67 | 3.20 | None | – | – |
| Case 4 (operator), diagnosed with ALL | ||||||
| Multiple¶ | C | 2.87 | 4.34¶ | None | – | – |
| Marking | C | – | 0.73 | None | – | – |
| SBA | C | – | 0.73 | None | – | – |
| TSF | C | – | 0.73 | None | – | – |
| MVP | C | – | 0.73 | None | – | – |
| Tin plating | C | – | 0.73 | Formaldehyde | 0.0065 mg/m3 | 0.0047 mg/m3-y |
| QE inspection | C | 0.70 | Ionizing Radiation | 0.0001 mSv/h | 0.14 mSv | |
| X-ray task | 0.0056 mSv/y | |||||
| Case 5 (operator), diagnosed with AML | ||||||
| Marking | C | 5.04 | 10.16 | None | – | – |
| Case 6 (maintenance), diagnosed with NHL | ||||||
| Tin plating | C | 5.67 | 9.14# | None | – | – |
| By-stander | C | 1.93** | 3.11** | Trichloroethylene | 0.13 mg/m3 | 0.405 mg/m3-y |
*Job title has been given parenthetically.
†Equivalent to 2000 hrs/yr.
‡Agent identified as specifically associated the worker's specific cancer type.
§The 75th percentile calculated from the distribution in the job exposure matrix.
‖Administrative tasks occurred in offices, and employees were assumed not to enter the production or testing work area unless specified otherwise in the work histories obtained by KOSHA.
¶Individual worked in multiple process areas. Duration of time performing QE Inspection X-ray task specified in KOSHA work histories as 5.8 eight-hour days per month for 30 months. The remainder of work time divided among other SEGs.
#Reflects time spent in office.
**Trichloroethylene use discontinued in April 1995, during the employment of Case 6, and reflects time spent passing through process areas where trichloroethylene was used.
ALL, acute lymphocytic leukemia; AML, acute myelocytic leukemia; CMP, chemical–mechanical planarization; CVD, chemical vapor deposition; MVP, marking visual packing; NHL, non-Hodgkin lymphoma; SBA, solder ball attach; SEG, similar exposure group; TSF, Trim Sort Form; TWA, time-weighted average.