The photomultiplier as a beta detector

Bohra, D.; Parihar, A.; Rao, M. A. Padmanabha

doi:10.1016/0168-9002(92)90800-j

Cited by 2 publications

(2 citation statements)

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“…The experimental set up is nothing but a simple Gamma Ray Spectrometer with a difference in its probe [1,2,4,6]. Unexpected detection of UV dominant optical radiation owes to the use of bare PMT (9635QB, Thorn EMI) on which the source was directly kept, setting gain of the linear amplifier relatively higher than the requirement for a scintillation detector and time constant at 0.1 µs [4,6].…”

Section: B Equipmentmentioning

confidence: 99%

“…Previously, we have used in our laboratory a bare photomultiplier tube (9635QB, Thorn EMI) fitted with a preamplifier as a light sensor to test the efficacy of vari-ous scintillation materials [1]. When bare PMT was used to test locally developed thin film scintillators with beta emitters, it has been found to be a beta sensor [2]. However, when gain of the linear amplifier was set to be slightly higher than what is required for a scintillation detector performance of the PMT differed very much with radioisotopes and XRF sources, while background level remained optimum around 12 cps.…”

Section: Introductionmentioning

confidence: 99%

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UV dominant optical emission newly detected from radioisotopes and XRF sources

Rao¹

2010

Braz. J. Phys.

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The current paper reports first and definite experimental evidence for γ-, X-, or β radiation causing UV dominant optical radiation from (1) radiochemicals such as 131 I; (2) XRF sources such as Rb XRF source present as salts; and (3) metal sources such as 57 Co, and Cu XRF sources. Due to low quantum yield a need arose to develop two techniques with narrow band optical filters, and sheet polarizers that helped in the successful detection of optical radiation. The metal 57 Co spectrum observed at room temperature hinted that it could be optical emission from excited 57 Co atoms by a previously unknown phenomenon. In order to explain UV emission, it was predicted that some eV energies higher than that of UV, termed temporarily as Bharat radiation are generated within the excited atom, while γ-, X-, or β radiation passes through core-Coulomb field. In turn, the Bharat energy internally produced within the excited atom causes UV dominant high-energy spectrum by valence excitation. As excited atoms become free from surrounding unexcited atoms by valence excitation, room temperature atomic spectra of solid radioisotopes and XRF sources became a possibility. It implies existence of temporary atomic state of solids. The experimental evidence that γ-, X-, and β radiations causing UV dominant optical emission from within excited atoms of radioisotopes suggests the possibility for solar γ-, X-, and β radiations causing EUV by the atomic phenomenon described here.

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Section: B Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%