(a) Interpretation: The differences in terms of instrumental and radiochemical between prompt gamma ray neutron activation and delayed gamma ray neutron activation is to be found by using internet search engine or by using reference on NAA. Concept introduction: The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 32, Problem 32.21QAP
Interpretation Introduction

(a)

Interpretation:

The differences in terms of instrumental and radiochemical between prompt gamma ray neutron activation and delayed gamma ray neutron activation is to be found by using internet search engine or by using reference on NAA.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(b)

Interpretation:

The type of elements which prompt gamma ray activation analysis is to be determined.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(c)

Interpretation:

The reason for the delayed gamma ray emission used most often in NAA is to be determined.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(d)

Interpretation:

The reason for that NAA is very sensitive and selective method is to be determined.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(e)

Interpretation:

The following table represents the nature or behavior of the naturally occurring isotopes of crystal.

100% 919F(n,γ)920F t1/2=11s 1020Ne+β+ν¯
93% 1939K(n,γ)1940K
0.01% 1940K(n,γ)1941K
7% 1941K(n,γ)1942K t1/2=12.4h 2042Ca+β+ν¯

The elements 19F,20Ne,39K,41K,42Ca are stable and it is also considered that 40K is also stable as the half-time of this crystal is 1.3×109 years. The method for the irradiation and detection sequence is to be determined for the analysis of the fluorine.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(f)

Interpretation:

The method for the irradiation and detection sequence is to be determined for the analysis of the potassium.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

Interpretation Introduction

(g)

Interpretation:

The amount of the pure potassium fluoride sample 50-mg which is irradiated for 60s. By refereeing the section (e) the activity due to 20F and 42K in the sample is to be determined. The cross section are for the 20F and 42K are 0.0090×1024cm2 and 1.1×1024cm2 respectively and it is considered that flux density is 1.0×1013 neutrons.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

The formulas that will be used-

A=Nϕσ[1e(0.693tt1/2)]

Interpretation Introduction

(h)

Interpretation:

The disadvantage and advantage of NAA method over analytical method is to be determined.

Concept introduction:

The NAA method or neutron activation analysis method is defined as the process in which conversion of analyte element to the radioactive isotopes occurs because of the use of neutron irradiation.

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