RS. organs to radiation from external and interna] sources: lings, Ha gut, skeleton, thyroid, afc, WP | i . Fe. X, Reduction in life expectancy; validity of concept at low Toveln (PROPOSED REVISION) (Part Two) A. Methods end Standards of Radiation Protection 1, Historical trends and description 2. Basic acsumtions and philosophy 3. Description of current standards e Quantitative statements: radiation from externa) nomics b, Imits of measurement - concepts Kinds of radiation and conditions of exposure Stmplifying aneurptions to obtain prantical atarici’s nN. fn, Nadiation from internal sourcen S. Meaning ef maximum permionsible dose; safety factors Eo Ocoupational ve, environmental standards he Probable trends for the future Poesibility ef hasarde due to lew level oxposure 1. Threshold considerations Ro Why do we not knov wheSbor or not there lan theese? {re aach of the varloun rndiation effects of Inter-1:7 do. few and when eon we irpiove our knoviedge on “hte oo’) fo A radiologiet may bealinvea that the exfetenes oO” | threshold in probable or improbable... vhat ere + nonoiderationn pro and con? 2. JCAE Aceeptadtjity of currently reccimnonde! standards unde asnurption (apropos thresbold) | aire sy 2 sare

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