EG REFERENCE SOURCES

DESCRIPTION
A weighed amount of the standard solution is dropped on the disc of filter paper in the polystyrene capsule. The capsule is sealed up, when dried. The capsule and the reflector layer of common NaI(Tl) scintillators provide a sufficient filtering of b radiation of relevant radionuclide. For ¹⁴⁴ Ce this filtration is not sufficient and for the types EG 1 and EG 3 layer of minimum 3,2 mm Al between the standard and the detector is necessary.

 

APPLICATION
Energy and efficiency calibration of scintillation spectrometers and counters of g and X radiation. They can serve as reference sources for relative measurements. Their activity is chosen so that: standard EG 1 in closed geometry with the NaI(Tl) 38 x 25 mm ; standard EG 2 inserted to the well of NaI(TI) 45 x 50 mm and standard EG 3 located 10 cm from the forehead of NaI(Tl) 38 x 25 mm gives approx. 1700 counts per second for energy higher than 30 keV.

 

MEASUREMENT
The activity of individual standards is calculated from the mass of the standard solution and is checked by relative measurements of g photon flux. The specific activity is determined by absolute measurement

using 4p b-g , 4p a-g or 4p X- g coincidence method or 4p proportional counter.

 

Nuclide	Half life  days	Type	Activity kBq	Energy of photons g, keV	Yield of photons, %	Uncertainty, %	Code
22 Na	950	EG 1	5	511,0 1275,55	18,66 99,94	1,0	NAG - 1
		EG 2	3				NAG - 2
		EG 3	100				NAG - 3
54 Mn	312,22	EG 1	13	846,76	99,92	0,7	MNG - 1
		EG 2	6				MNG - 2
		EG 3	300				MNG - 3
57 Co	271,26	EG 1	6	122,06 136,46	85,45 10,77	1,0	CTG - 1
		EG 2	2				CTG - 2
		EG 3	150				CTG - 3
60 Co	1925,4	EG 1	10	1173,21 1332,47	99,865 99,981	0,7	COG - 1
		EG 2	4				COG - 2
		EG 3	200				COG - 3
65 Zn	243,9	EG 1	40	1115,52	50,75	1,6	ZNG -  1
		EG 2	18				ZNG - 2
		EG 3	800				ZNG - 3
88 Y	106,6	EG 1	8	898,021 1836,030	93,52 99,36	1,2	YWG - 1
		EG 2	4				YWG - 2
		EG 3	200				YWG - 3
129 I	5,734.10 9	EG 1	15	39,58 29 - 33 X K	7,46 > 70	0,7	IZG - 1
		EG 2	5				IZG - 2
133 Ba	3897	EG 1	3	80,989 302,795 355,95	34,2 18,46 62,22	0,8	BAG - 1
		EG 2	2				BAG - 2
		EG 3	80				BAG - 3
137 Cs	11019	EG 1	16	661,649	85,10	0,9	CSG - 1
		EG 2	7				CSG - 2
		EG 3	300				CSG - 3
141 Ce	32,50	EG 1	10	145,444	48,43	0,9	CKG - 1
		EG 2	3				CKG - 2
		EG 3	250				CKG - 3
144 Ce	284,4	EG 1	30	133,531	11,09	1,1	CEG - 1
		EG 2	8				CEG - 2
		EG 3	600				CEG - 3
152 Eu	4858	EG 1	30	from 121 to 1538 keV	depends on energy	0,8	EUG - 1
		EG 2	15				EUG - 2
		EG 3	450				EUG - 3
203 Hg	46,72	EG 1	8	279,19	81,49	1,1	HGG - 1
		EG 2	3				HGG - 2
		EG 3	200				HGG - 3
241 Am	157800	EG 1	15	59,5364	35,67	0,6	AMG - 1
		EG 2	5				AMG - 2
		EG 3	450				AMG - 3

 

 

Type EG 1 and EG 3

 

 

 

Type EG 2

 

 

 Annotation:

 Uncertainty is an abbreviation for combined standard uncertainty ( P = 68,3 %).

 

MBSS STANDARDS IN MARINELLI BEAKERS

DESCRIPTION
Marinelli beakers are filled with silicone rubber containing uniformly distributed radionuclide or mixture of radionuclides. Default density of the active volume is 0,98 g.cm ^-3 and mean atomic number approaches water. The standards are available in 3 types of polypropylene beakers with default volumes 450, 500 and 1000 ml. Other volumes, nuclides, activities or beakers are available on request.

 

APPLICATION
Energy and efficiency calibration of gamma spectrometers.

 

MEASUREMENTS
The standards are prepared from the standard solutions ER(EB) whose activity is determined by absolute method. The final sources are checked by measurement on gamma spectrometer with HPGe detector. Combined standard uncertainty of activity is approx. 2 %.

 

Type	Nuclide	Half life, days	Activity, kBq
MBSS 1	152 Eu	4858	3
MBSS 2	mixture according to IEC 697/81	-	40
MBSS 3	134 Cs	753	*
MBSS 4	137 Cs	11019	3
MBSS 5	226 Ra	584300	3
MBSS 6	57 Co	271,26	*
MBSS 7	60 Co	1925,4	3
MBSS 8	241 Am	157800	10
MBSS 9	232 Th	5,15 . 10 12	1,5
MBSS 10	153 Gd	241,6	*
MBSS 12	133 Ba	3897	*
MBSS 13	109 Cd	462,6	20
MBSS 14	210 Pb	8108	*
MBSS 15	192 Ir	74,12	*
MBSS 16	85 Sr	64,78	*
MBSS 17	54 Mn	312,22	*
MBSS 18	88 Y	106,60	*
MBSS 19	139 Ce	137,50	*
MBSS 20	40 K	4,602 . 10 11	1,5

* - on request

 

 

 

 

                     

 

 

          Type 0530G                                        Type 0540G                                  Type 1040G

 

Annotation:

Uncertainty is an abbreviation for combined standard uncertainty ( P = 68,3 %).

 

 

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