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LS 6000 Scintillation System User’s Manual

PN 247971-F

5-13

Data Calculation

Xtal DPM

The Xtalscint DPM program assumes the samples are counting to the same efficiency. Instead

of a quench curve, only one dpm standard is required. The efficiency of this standard is

deter-mined at the beginning of the sample set by counting a standard with a known dpm

prepared in the same manner as the samples. This calculated efficiency is used to calculate the

dpm of the remaining samples in the set.

Setting Up Xtal DPM

When editing a User Program, from the Data Calculation Menu (Figure 5.1), choose XTAL

DPM. The menu displayed is shown in Figure 5.11. The prompts for the standard used to

determine the dpm and for unit selection are described below. The remaining prompts are the

same prompts described for the CPM program. Refer to Setting Up CPM/Xtal CPM Section 5

for information on setting these prompts.

DPM in Standard

Calculate this dpm using the DPM of the Standard listed by the manufacturer on the label of

the isotope container used to make the Xtalscint Standard. DPM for the standard must be

entered.

To enter DPM of the Standard, highlight this prompt and enter the dpm using up to 7 digits

and a decimal point.

Figure 5.11 Data Calculation Menu for Xtal DPM.

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Motorola LS6000B-U Betriebsanweisung Seite 91