Table 4.
Threshold values of measurable dose quantities for which there are risks of skin effects following IR procedures
| Peak skin dose (Gy) |
Ka,r(Gy); body |
PKA (Gy cm2); body |
Ka,r(Gy); head |
Risk of tissue reaction |
|---|---|---|---|---|
| 2–3 | 3–8 | 150–300 | 2–5 | Tissue reactions unlikely to occur |
| 3–5 | 5–12 | 300–800 | 3–8 | Small risk of transient erythema and epilation. Recovery from hair loss |
| 5–8 | 8–20 | 400–1200 | 5–12 |
Risk of erythema and epilation in some patients. Effects may appear within 2–8 weeks Erythema may be prolonged |
| 8–12 | 12–30 | 600–2000 | 8–16 | Transient erythema expected as a prompt effect. Skin desquamation, prolonged epilation |
Note: threshold values are different for cumulative air kerma (Ka,r) and air kerma area product (PKA) for FGIs in the body and head, but peak skin dose levels are identical!