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Footnotes to T ab le II
a T h e m in im u m d e te c ta b le le v e ls (M D L ) are p r a c t ic a l d e te c tio n le v e ls rather than th e o r e tica l d e te c tio n le v e ls . T h ese le v e ls are c h a ra cte ris tic o f the a n a ly tic a l p roced u re and
the c o u n tin g in stru m en tation in u se. T h e M DLs listed assum e the fo llo w in g in stru m en tation: (1) low ba ck g rou n d b eta cou n ter; (2 ) standard g a m m a s c a n — 4 0 0 to 51 2 m u ltich
a n n e l a n a ly ser — 4 x 4 - in c h N a l (T l) d e te c to r ; and (3 ) tritiu m -liq u id s c in tilla tio n c ou n ter. T h e d e t e c t io n lim it for a s p e c ific ra d io n u clid e b y g a m m a -s p e ctr o m e tr y is
d ep en d en t u p on the qu a n tities o f oth e r ra d io n u clid e s p resen t in the sa m p le . T h e d e te c tio n lim its tested are those p r a c t ic a lly obta in ed w ith the c o n c e n tra tio n s and m ix tu res o f
ra d io n u clid e s n o rm a lly en co u n te r e d w ith en v ir o n m e n ta l sa m p les. I f on ly a sin gle r a d ion u clid e is p resen t in a sa m p le to b e an a lysed by g a m m a -s p e c tr o m e tr y , th en the d e te c tio n
lim its listed c o u ld p ro b a b ly b e r ed u ced b y a fa c to r o f 2 . T h e d e te c tio n lim its fo r s p e c ific n u clid e s w ou ld b e c o n sid e ra b ly g rea ter than those listed w h en c o m p lic a t e d m ixtu res
are en co u n te r e d and in p a rticu la r w h en c e rta in con stitu en ts are present in r e la tiv e ly h ig h co n c e n tra tio n s.
b T h ese v a lu es w ere ob ta in e d b y a sim p le ra tio re la tin g R adiation P rotection G u id es o f the F ed era l R ad ia tion C o u n c il to th e dose a s socia ted w ith these G u id e s. A ctu a l dose
c a lc u la tio n s resultin g fro m s p e c ific e n v ir o n m e n ta l le v e ls should take in to con sid era tion a d d ition a l fa ctors rela tin g to pathw ays, in ta ke and oth er en v ir o n m e n ta l fa c to rs as
ap p rop ria te.
c Intake v a lu es assum e standard m a n qu a n tities or oth er referen ced valu es as follo w s:
1 . 1 litre o f m ilk p er d ay for a 1 - y e a r - o ld c h ild .
2 . 1 . 2 litres o f w ater p er d a y , a d u lt.
3 . 20 m 3 o f air breath ed p er d ay for an a d u lt.
4 . 4 . 7 m 3 o f air b ea th ed p er d a y for a 1 - y e a r - o ld c h ild .
5 . 1 .8 7 kg fo o d con su m ed p er d a y for to ta l d ie t o f a teen a g er.
6 . 50 g p er d a y o f sh ellfish .
^ T h e an n u al in ta k e o f air is for a c h ild (a g e 1 y e a r ). In the case o f 131I, the c h ild thyroid is the lim itin g fa c to r .
e CaF2:M n d o sim e te r e n ca p su la ted in 40K -fr e e glass or e q u iv a le n t.
^ A ssu m in g tem p eratu re o f 75*F and 90^o r e la tiv e h u m id ity .
8 T h e c r it i c a l orga n for 3 H g as m a y be the skin, d ep en d in g upon the state o f the 3H (gaseous or o x id e ) . T h e b o d y tissue is used as the m o st c o n serv a tiv e c a s e ,
k A ssum ed w orst c a se m ixtu re o f lOO^o 60C o .
i P roced u re B un der sh ellfish is for a q u eou s solu tion s so that p relim in a ry sa m p le p reparation is n ecessa ry p rior to en terin g this p r o c e d u re .
APPENDIX I