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Crystal Structure:
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Cheetham A K , Fender B E F , Fuess H , Wright A F , Acta Crystallographica, Section B , 32 (1976) p.94-97, A powder neutron diffraction study of lanthanum and cerium trifluorides, Locality: synthetic
Estimated Radioactivity from Fluocerite-(Ce) - weak
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Becquerels (Bq)
Calculated Activity Curies (Ci)
Estimated Activity GR(api)
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 6.78 cm
1,591,897
4.30E-05
65,341.76
21.48
100 gm / 3.14 cm
159,190
4.30E-06
6,534.18
2.15
10 gm / 1.46 cm
15,919
4.30E-07
653.42
0.21
1 gm / 6.78 mm
1,592
4.30E-08
65.34
0.02
0.1 gm / 3.14 mm
159
4.30E-09
6.53
0.00
0.01 gm / 1.46 mm
16
4.30E-10
0.65
0.00
0.001 gm / 0.68 mm
2
4.30E-11
0.07
0.00
Weight of pure Fluocerite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.14 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 ( 3.55 % Th) From Sum REE Elements (71.07 % REE)