Table 1.1-— RELATION OF PARTICLE SIZE TO ORGAN
DEPOSITION OF INHALED RADIOACTIVE SILICEQUS
DUST IN FEMALE DUTCH RABBITS*¢
particle
Beta-gamma activity! above background, d/sec
size of
dusts u
Lungs
Stomach
0.47
$.00
13.9
370.0
47,4
33380
9.00
49.9
Small
intestine
Caecum
Large
intestine
$1.6
31.4
wd
7080
All values represent the mean from four separate azimals exposed simultaneously.
All animals were given a single 4-Ar head exposure to the dust
and were sacrificed 0 to 1 hr later,
$Dust concentration used wae 2 x 10° d/min/m’,
@Values shows for beta-gammsa activity were determined from
ashed: spectmens of whole organs.
Table {.2-—-RATE OF REMOVAL OF PRODIGIOSIN DUST* FROM
LUNGS OF NORMAL AND X- IRRADIATED RABBITS
Time of
Micrograms of prodigiosin per gram of lung tisauet
determination
(after dust
exposure), hr
Normal rabdites
0
24
4.0
1.0
32
0.0
48
Irradiated rabbits
(7 daye after 800-r
whole-body radiation’)
’
0.6
23
8.0
0.25
0.0
0.0
*Denaity of prodigtosia dust = 1.0,
tEach value represente the mean from gix separate antmale.
2250-kvp X-raye having a beam with « half-value layer of 1.98 mm
of copper,
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