ML20128N292
| ML20128N292 | |
| Person / Time | |
|---|---|
| Issue date: | 05/08/1985 |
| From: | NRC OFFICE OF THE SECRETARY (SECY) |
| To: | |
| References | |
| SECY-85-147, SECY-85-147-ERR, NUDOCS 8506030224 | |
| Download: ML20128N292 (3) | |
Text
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9 MAY 8, 1985 C
O R
R-E C-T I
O N
N O
T I
C E
TO ALL HOLDERS OF SECY-85-147 PROPOSED REVISION TO 10 CFR PART 20,
" STANDARDS FOR PROTECTION AGAINST RADIATION"
~
(COMMISSION ACTION ITEM)
- ATTACHED ARE PAGES 96:AND*201 OF. ENCLOSURE 1, PLEASE INSERT IN YOUR COPIES OF -THE SECY/ PAPER. ~
ATTACHMENTS:
AS STATED THE SECRETARIAT
+
1 gh 85-147 [24 850508 DR
~
j PDR j
- ~..
i
1'[
[7590-01]
t (6) The prefixes in Table 1 are used when the unit of radiation
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dose is expressed in the International System of. Units (SI).
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TABLE 1 - SI~ PREFIXES' a.
3?
+i Factor Prefix Symbol Factor Prefix Symbol
-!U 1018 exa E
10 1 deci d
}
101s peta P
10 2
, centi c
1012 tera T
10 3
. milli m
109 giga G
10 8
' micro p
g.
108 mega M
10 9
. nano n
r 103 kilo k
10 12
-pico p
j 102 hecto h
10 is femto f
E-101 deka da.
10 18 atto a
f (b) For the purposes of the regulations in this part, any of the f-following is considered to result in a dose of 1 rem:
4 (1) An exposure of 1 roentgen of x-or gamma-radiation, except for I
personnel monitoring purposes which shall comply with the requirements in S 20.501(c);
[
(2) An absorbed dose, in tissue, of 1 rad due to beta radiation; i
(3) An absorbed dose, in tissue, of 0.05 rad due to alpha particles, fission fragments, and other particles heavier than neutrons; or j
(4) An absorbed dose, in tissue, of 0.1 rad due to neutrc,ns or
{
.high energy protons, f
(c) If it is more convenient to measure the neutron fluence rate 1
than to determine the neutron dose equivalent rate in rems per hour, as f
provided in paragraph (b)(4) of this section, 1 rem of neutron radia-
}
tion of unknown energies may, for purposes of the regulations in this
]
part, be assumed to result from a total fluence of 25 million neutrons f
per square centimeter incident upon the body.
If sufficient information
+
exists to estimate the approximate energy distribution of the neutrons, h
the licensee may use the incident fluence equivalent to 1 rem or the k
appropriate Q value from Table 2 to convert a measured tissue-dose in j
rads to dose equivalent in rems.
A w
3 t
96 g
j i
- l Tcbla 1 Tabla 2 Tabla 3 OCCUPATIONAL VALUES REFERENCE LEVEL RELEASE TO
~ '
CONCENTRATIONS SEWERAGE
~
~ Col. 1-Col. 2-Col. 3-Col. 1-Col. 2-Oral.
Inhalation Monthly Ingestion
Air Water Average Atomic.
ALI No.
Radionuclide Class (pCi)
(pci)
(pCi/ml) (pCi/ml)
(pCi/ml)
(pCi/ml) 57 8.anthanum-138 D, see La 9x10 4x10 1x10 5x10 1x10 1x10'4 131 2
0
-9
-22
-5 13I 1
~9
~II W, see La~
1x10 6x10 2x10 131 2
3
-7
-9
-6
-5
- 57 Lanthanum-140 D, see La 6x10 1x10 6x10 2x10 9x10 9x10 131 3
-7
-9 W, see La 1x10 5x10 2x10 57 Lanthanum-141 0, see La 4x10 9x10 -
4x10 1x10 5x10 5x10
- 131 3
3
-6
-8
-5.
W, see La 1x10 5x10 2x1b-8 131 4
-6 2
131 3
4
-6
-8
~4
-3 57 Lanthanum-142 D, see La 8x10 2x10 9x10 3x10 1x10 1x10 131 4
-5
-8 3x10 1x10 5x10 W, see La 2
131 4
5
-0
-7
-4
-3 57 Lanthanum-143 0, see La 4x10 1x10 4x10 1x10 5x10 5x10 131 4
-5
-7 W, see La 9x10 4x10 1x10 58 Cerium-134 W, all compounds except 2
2
-7
-9
-6
-5 those given for Y 5x10 7x10 3x10 1x10 7x10 7x10 Y, oxides, hydroxides 2
-7
-10 and fluorides 7x10 3x10 9x10 134 3
3
-6
-9
-5
-4 58 Cerium-135 W, see Ce 2'x10 4x10 2x10 5x10 2x10 2x10 134 3
-6
-9 Y, see Ce 4x10 1x10 5x10 134 3
3
-6
-9
-5
-4 58 Cerium-137m W, see Ce 2x10 4x10 2x10 6x10 3x10 3x10 134 3
-6
-9 Y, see Ce 4x10 2x10 5x10 e
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12/92 TRAtEM1TML 'IO:
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