As Low As Reasonable Achievable (ALARA)
In addition to maintaining radiation dose below the limits set forth by regulatory dose limits, work with sources of ionizing radiation shall be planned and conducted to keep doses as low as reasonably achievable (ALARA).
The table below outlines the actions and action levels for OSU's ALARA program.
Monitoring Type | Action Level | Action |
Deep Dose Equivalent |
>0 mrem | report to individual and Program Director (PD) |
50 mrem cumulative | ADRI* | |
Shallow Dose Equivalent (skin or extremity) |
>0 mrem | report to individual and PD |
500 mrem cumulative | ADRI |
|
Lens Dose Equivalent |
>0 mrem |
report to individual and PD |
150 mrem |
ADRI |
|
Thyroid | All Thyroid Scans | report to individual and Program Director |
500 mrem CDE cumulative |
RS investigates |
|
Urinalysis | all urine bioassays | report to individual and PD |
50 mrem CEDE cumulative | RS investigates | |
Unrestricted Area, |
50 mrem cumulative | RS investigates |
100 mrem cumulative |
modify facility and/or |
|
Unrestricted area, effluents | ≥ 10% of concentration limit | RS investigates |
≥ 1mrem TEDE to general public | RS investigates | |
Minors (under age 18) | >0 | report to individual and PD |
≥10% of adult occupational action levels |
ADRI | |
Fetal monitoring | 5 mrem cumulative | ADRI |
*ADRI = Abnormal Dosimeter Reading Investigation. This is an investigation conducted by Radiation Safety to attempt to reduce exposure to zero if possible.