REPORT FOR ANALYTICAL CHEMISTS
NUCLEAR-CHICAGO RESEARCH QUALITY RADIOCHEMICALS
LIQUID SCINTILLATION STANDARDS
Four sets, two individual scintillation standards, and two standardized solu tions for internal calibrating are available. SCINTILLATION STANDARDS SETS Consist of calibrated samples c o n t a i n i n g PPO a n d POPOP in t o l u e n e . Volume of each s t a n d a r d is 15 m l , sealed in a 2 0 m l lowactivity glass vial. Packaged in foamed-plastic holders which double as storage racks. Stated activities w i t h i n ± 3 % of t r u e values. Certifica t i o n of each s t a n d a r d supplied with each set. Unquenched c u and H 3 Set. Consists of u n q u e n c h e d s a m p l e s of c a r b o n - 1 4 a n d tri t i u m labelled toluene plus a toluene blank. Model 1 8 0 0 4 0 Set, c o m p l e t e $65.00 Quenched H ' a n d C14 Sets. Accurately assayed s t a n d a r d s . Each has d i f f e r e n t c o u n t i n g rate d u e to q u e n c h i n g . Model 1 8 0 0 5 0 T r i t i u m Set (5 s t a n d a r d s , 1 χ 10 6 d p m n o m i n a l each) $65.00 Model 1 8 0 0 6 0 Carbon-14 Set ( 6 s t a n d a r d s , s 2 χ 10 d p m nominal each) $ 75.00 Model 1 8 0 0 7 0 (both sets) $125.00
T R E N D S : I n the near future E u ropean companies will most likely change drastically in their market ing approach, but not so much in their research and development ef fort. Different signs indicate this trend. First, most companies have made their literature available in the local language, as well as Eng lish. Second, as shown in an inter esting series of article by Mercer {1) the problem of marketing out side one's own country is realized. And third, a few companies do as sociate with American companies, for example, TJnicam with Microtek (now a wholly owned subsidiary of Tracer, Austin, Texas), Camag with Gelman, and Hilger-Watts with Engis. The latter combination re sulted in a new company, HilgerEngis, which produces a monochro mator in the Czerny-Turner con figuration in the U. S. A E I (mass spectrometers) is represented by Picker, and General Instrument Company (Fourier spectrophoto meters) merged with Beckman. Shandon recently opened its own
office in this country. Large com panies like Siemens and Philips have for a long time had their own sales organizations here. Doubtless they will increase their efforts when they get more instruments available for the market under discussion. The final result will be a market ing approach similar to the one in the United States, and more feed back from sales into the research and development departments will occur. INSTRUMENTATION
A few different techniques will be discussed more elaborately, and for this the opinion of a few European companies was asked. The com panies were selected according to their product line and their country and do not necessarily reflect a good average. European companies are more closed about their future plans and sales figures than Ameri can companies, which makes it rather difficult to make a forecast on straightforward information.
Quenched S " Set. Six accurately assayed quenched standards. Model 138 0 0 8 0 Sulfur-35 Set ( 6 s t a n d a r d s , 4 χ 10 d p m nominal each) $80.00 INDIVIDUAL STANDARDS P32 and S " Scintillation Standards. Furnished in flame-sealed, 2 0 m l low-activity glass vials. Stated activities within ± 4 % of t r u e values. Individual certification supplied with each standard. Model 1 8 8 3 5 0 Phosphorus-32 (15 m l , 2 χ 10* d p m nominal) $40.00 Model 1 8 8 2 4 0 S u l f u r - 3 5 (15 m l , 4 χ 1 0 s d p m nominal) $30.00 Standardized Solutions of Toluene-C' 4 and Toluene-Η 3 . For internal calibration in liquid scintillation counting. Supplied in flame-sealed glass a m p o u l e s . Stated activities are within ± 2 % of t r u e values. Individual certification supplied with each s t a n d a r d . Model 1 8 8 2 7 0 Toluene-C 1 4 (5 m l , 3 χ 10* d p m nominal) $20.00 Model 1 8 8 2 8 0 Toluene-H 3 (5 m l , 5 χ 10 4 d p m nominal) $20.00
Detailed specifications are available on request, as are current schedules containing complete radiochemical listings and information. Please write, or call 312 827-4456 collect. NUC:G-4-271
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NUCLEAR-CHICAGO A DIVISION OF NUCLEAR - CHICAGO CORPORATION
351 Howard Avenue, Des Plaines, Illinois 60018 Circle No. 196 on Readers' Service Card 32 A
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ANALYTICAL CHEMISTRY
Figure 2. Present grating monochromator; covering the range from 2000 to 10,000 A, with unilateral slit [and, in near future, exchangeable gratings] (Hilger and Watts)
