Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Hardness:
4.5-5 - Near Apatite
Luster:
Vitreous - Waxy
Streak:
gray white
Optical Properties of Cebaite-(Ce)
Gladstone-Dale:
CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1447,KPDmeas= 0.1441,KC= 0.1498 Ncalc = 1.72
Bulk Density (Electron Density)=4.20 gm/cc note: Specific Gravity of Cebaite-(Ce) =4.79 gm/cc.
Fermion Index:
Fermion Index = 0.07 Boson Index = 0.93
Photoelectric:
PECebaite-(Ce) = 325.88 barns/electron U=PECebaite-(Ce) x relectron=1,369.67 barns/cc.
Radioactivity:
GRapi = 25,457.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Cebaite-(Ce) per GRapi unit = 39.28 (PPM)
Cebaite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Cebaite-(Ce) - weak
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Bequerols (Bq)
Calculated Activity Curies (Ci)
Estimated Activity GR(api)
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.36 cm
609,282
1.65E-05
25,457.94
8.37
100 gm / 3.42 cm
60,928
1.65E-06
2,545.79
0.84
10 gm / 1.59 cm
6,093
1.65E-07
254.58
0.08
1 gm / 7.36 mm
609
1.65E-08
25.46
0.01
0.1 gm / 3.42 mm
61
1.65E-09
2.55
0.00
0.01 gm / 1.59 mm
6
1.65E-10
0.25
0.00
0.001 gm / 0.74 mm
1
1.65E-11
0.03
0.00
Weight of pure Cebaite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.79 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
** Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.36 % Th) From Sum REE Elements (27.20 % REE)
Chemical Formula: Small.jpg)
- weak