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Regional Basic Professional Training Course in Korea

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❙ 101 ❙<br />

2. Radiation Protection<br />

The recommended dose limits are set at a judged level of risk. These are that a worker<br />

should not be expected to accept a lifetime risk of cancer greater than 3 – 4 % while a<br />

member of the public should not have to accept a risk greater than 0.3 ‐ 0.4 %. Us<strong>in</strong>g risk<br />

estimates for fatal cancer from Table (2.4) and the lower of these numbers <strong>in</strong> case, we have:<br />

Worker with a work<strong>in</strong>g life of 40 years: 0.03 = (40 years) x (40 x 10 6 mSv ‐1 ) x<br />

(dose limit), giv<strong>in</strong>g a dose limit of ~ 20 mSv yr ‐1<br />

Member of the public with a life‐span of 70 years: 0.003 = (70 years) x (50 x10 ‐6<br />

mSv ‐1 ) x (dose limit), giv<strong>in</strong>g a dose limit of ~ 1 mSv yr ‐1<br />

Table (2.6) Summary of Dose Limit for the public at large and occupationally exposed radiation workers<br />

from [1] and [4]. All limits apply. The limits to specific organs are necessary to prevent<br />

determ<strong>in</strong>istic effects to some organs even when effective dose is not exceeded.<br />

Public<br />

Parameter ICRP 60/103 [1] [2] NCRP 116 [4]<br />

Effective Dose:<br />

Annual<br />

Equivalent Dose:<br />

Annual<br />

Occupational<br />

Effective Dose:<br />

Annual<br />

Cumulative<br />

Equivalent Dose:<br />

Annual<br />

1 mSv:<br />

5 y average ≤ 1 mSv<br />

15 mSv: eye lens<br />

50 mSv: sk<strong>in</strong>, hands, feet<br />

50 mSv<br />

≤100 mSv <strong>in</strong> 5 yr<br />

150 mSv: eye lens<br />

500 mSv: sk<strong>in</strong>, hands, feet<br />

1 mSv: if cont<strong>in</strong>uous<br />

5 mSv: if <strong>in</strong>frequent<br />

15 mSv: eye lens<br />

50 mSv: sk<strong>in</strong>, hand, feet<br />

Public<br />

50 mSv<br />

10 mSv x age(yr)<br />

150 mSv: eye lens<br />

500 mSv: sk<strong>in</strong>, hands, feet

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