JP3270067B2 - Portable measurement device and data storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting radiation which is dangerous to living organisms, especially humans, and has a cumulative effect with time.

[0002]

It is known that gamma rays generated in nuclear power plants are particularly dangerous. Regulations stipulate that the radiation dose an individual receives during his or her life must be less than or equal to a predetermined millirem dose.

[0003] Similarly, radiologists and those operating X-ray equipment are exposed to various doses of radiation, the cumulative effects of which are dangerous. In this case, the law also stipulates that the dose received by these persons in their lifetime must not exceed the set limits.

[0004] In addition, there are various types of radiation, such as radiation from ultraviolet rays or charged particles, and the accumulation of dose due to exposure to these radiations for a certain period of time is dangerous.

There are certain procedures for checking the dose received by people who may be exposed to gamma radiation.
In these procedures, each individual is provided with a device to record the dose received.

To date, there are two types of such devices. The first type of device is photographic film carried by each individual who may receive dangerous radiation. Disadvantages of such devices are that they do not immediately inform the holder, and that this type of detection method requires a relatively complex system for managing information on the dose received. . Also, the device provides information only on the cumulative dose received during a given period, generally on the order of one month, and the information provided to the holder is generally very simple. That is, the carrier only knows whether the received dose is above or below an acceptable threshold.

A second type of device is in the form of a large pack containing the following elements: That is, a radiation detector, a cumulative dose storage circuit, an alarm device triggered when the dose rate exceeds an allowable limit, a display device of a dose accumulated while the measuring device is being carried, and a connection means with an external circuit. .

A second type of device is generally used in facilities where potentially dangerous radiation can be generated. These devices are usually placed in a rack where their batteries can be charged. Upon entering such a facility, each individual must use an identification badge to gain access to the rack containing the equipment, in which case the signal in the rack will indicate the equipment assigned to that individual. Thus, the centralized management system knows the relationship between the badge holder and the device.

When the holder leaves the facility, the device is returned to the rack, and at this moment, the accumulated dose information is transmitted to the management center by the connecting element provided on the device.

This device is large and requires a large management system as in the case of film. The device also only informs of the dose accumulated while the holder is wearing the device, i.e. over several hours.

Further, there has been proposed a portable device for recording the dose received over a certain long period of time in order to measure the radiation dose received by each individual (ie, Japanese Patent Application No. EP-A-0 191 527).
No. 300,054). However, the measuring device described in this document is also relatively large, and thus it is difficult for the user to always wear it. Further, data storage for a long period of time is performed in a removable fixed memory. Such detachability causes uncertainty. If the name ze a mule user forgets to insert the device into the memory, the apparatus is do not store the dose in principle.

US Pat. No. 4,608,655 describes a dosimeter for radiation received by workers in the nuclear industry. The dosimeter is always worn on the wrist. However, since it is worn at the end of one limb, it measures the dose received at that point and not the whole body, especially the torso. Further, the dosimeter performs only a limited number of operations.

[0013]

SUMMARY OF THE INVENTION The present invention seeks to overcome the above disadvantages.

[0014]

The apparatus according to the invention comprises a radiation or particle sensor, means for calculating the integrated dose, and a memory for storing data relating to the carrier and the integrated dose. In this device, all components are housed in a flat package that forms a single block of the shape and size of a rectangular credit card.

[0015]

The credit card type dosimeter of such a standard size is naturally placed in the holder's wallet and generally placed in a pocket near the top of the torso or near the waist. In other words, because of the shape of the device of the invention, it can always be carried at first and secondly a representative value of the dose to the whole body can be measured.

[0016] Management is facilitated because of the permanent recognition of the holder. Transmitting the data collected by the device to the information processing center is not absolutely necessary, holders if individuals, is because it is possible to check the whole dose the holder has accumulated on its own . Furthermore, due to this recognition means, the dose accumulation takes place over a long period of time.
This device can also be held for a lifetime by an individual.

The information on the status of the holder contained in this device can be used for purposes other than checking the accumulated dose. Another such purpose is, for example, to pay a fee or check in and out of a particular location. Therefore, there is another motivation to keep the device at all times.

Placing or printing the holder's name and / or picture on the device facilitates personalization of the device. In that case the device can be used as identification, and this is generally visible,
Or attach it to the right or left side of a vest, or to a collar or belt. These locations are also suitable for accurate measurement of the accumulated dose.

Although the apparatus of the present invention may limit operation by the management center, such operation will last only as long as necessary, especially for checking.
Thus, in one embodiment of the invention, means are provided for connecting the device to an information processing center such as a computer. The connection means is an antenna, for example a wireless tag consisting of a small flat transmitting / receiving antenna, which can be integrated into a credit card-like device. In this case, the connection with the information processing device or similar device is automatically set without requiring the user's operation and without the user's awareness, so that the reliability of use of the device is increased. In prior art devices, on the other hand, the user had to move certain elements, especially for connection or disconnection.
In the device according to the present invention, the connection with the processing center or the command transmitting device is performed in real time.

One or more keys and a display screen are preferably provided for querying so that the user can access the information stored in the memory of the device.

According to another embodiment of the present invention, in a portable device for measuring the dose rate and dose of gamma, ultraviolet or X-ray photon radiation or charged particles to which a carrier is exposed, said device comprises: A radiation or particle sensor, a means for calculating the accumulated dose, and a storage memory for data on the carrier and the accumulated dose, and the device is capable of simultaneously providing date information (date, week, month, etc.) with information on the dose and / or dose rate. And a year) in a memory. With such a structure, information management is performed over a long period of time by the date information and autonomy of the device is obtained, but in the prior art, the management was performed by a system external to the portable device. This structure is preferably used for the first embodiment of the invention. However, such a structure can be used independently. That is, the device need not be of the credit card type.

In order to make the memory of the device a low-capacity memory, and thus to make the device compact and inexpensive, the stored data must be stored in a microprocessor and a clock.
It is particularly preferred that the calendar be updated constantly or periodically so that only the dose information accumulated during the most recent period is kept in memory. For example, the memory stores only the following data. Cumulative dose for each day of the 7 days that have passed: Cumulative dose for each week of the 3 weeks that have passed (for earlier weeks, the dose calculated daily is erased from memory): the last 3 months that have passed Cumulative dose for each month: and for the remainder of the year, each cumulative dose for the three quarters passed: and finally, for the passed years, only the cumulative dose at the end of each year is stored in memory.

In this way, several kilobits of memory can be used according to the invention, but in the case of the prior art devices a much larger memory was required.
For example, in the portable memory of EP 300,054 daily dose information is collected and permanently stored in this memory. The structure of such a device is 0.
Requires 5 megabits of capacity. If the storage of daily dose information takes N bits per data / dose, then 10
Annual information storage would require 3650 × N bits. According to the invention, for the above example, about (7 + 3 + 3 + 3 + 9) N = 25N bits would be required for 10 years.

The management of the information stored in the memory enables other functions. For example, the accumulated dose for the 13 weeks that have passed is always determined, and an alarm can be generated when the accumulated dose during this period exceeds a predetermined maximum level of 3 rem.

Also, for example, the device of the present invention can be used by a carrier to determine the dose accumulated at a particular location for a particular time period.

Although the preferred application of the device is in detecting the dose accumulation received by an individual, the device can be applied to an object or location in other applications. In these applications, the device includes an identification of the object or location. For example, if the object is a container of radioactive material, i.e., a material that emits X-rays, UV radiation or charged particles, the device can be used to measure the dose emitted from the container to the outside. In other applications, the device can be permanently fixed at a particular location to determine the cumulative dose received at that location. In the latter case, several devices can be placed at the location to determine the radiation exposure at each point at this location relative to the date.

In another use, the device detects the amount of ultraviolet radiation received by the individual. In this way, it is possible to determine the maximum amount of daily exposure to sunlight and prevent sunburn.
This maximum daily exposure time is determined by the device corresponding to the carrier's characteristics, age, skin pigmentation, and exposure experience stored in memory.

In still another embodiment of the present invention,
Generally, in a portable device for accumulating data comprising a calculating means and a data storage memory, the device stores in a memory a clock-calendar that stores date information in the memory simultaneously with the data, and only the accumulated dose for the most recent period. And a portable device including a controller or microprocessor such that the cumulative dose is constantly and periodically updated.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to FIGS.

The embodiment shown in the accompanying drawings is an example of a device carried by an individual. This device takes the form of a card with a standard form of credit card (FIG. 1). This device allows the measurement of each individual's exposure (dose or dose rate) to gamma, ultraviolet (UV), or X-ray photon radiation or charged particles. The primary embodiment of this specification is the detection of gamma rays.

FIG. 2 is a block diagram of the various elements and functions within the device 10.

The device 10 has a detector 12 including a solid state sensor 13 designed to detect incident radiation having a cumulative effect of causing harm to the human body. The sensor 13 is a small-sized semiconductor element that can be accommodated in the flat card 10. The purpose is to provide a number of pulses 14 proportional to the flow of incident photon particles.

The pulse 14 is applied to a processing circuit 16 through a pulse shaping element 15.

The circuit 16 counts the received forming pulses 17 and performs linearization and sensor calibration. Calibration of the sensor is typically performed at the factory against a standard source, for example, with a cobalt 60 source if the sensor is of a gamma detection design. Linearization is also performed at the factory. This consists in converting the response of the sensor so that the number of counted pulses is proportional to the number of millirems detected.

The sensor 13 is, for example, disclosed in European Patent Application Nos. 175 and 3
No. 69.

The output of the circuit 16 and thus the detection unit 12
Is connected to the input of the data processing unit 18.

This processing unit includes a microprocessor 19 having an input 19 ₁ connected to the output of circuit 16 by an interface circuit 20. The microprocessor also has input-output 19 ₂ , 19 ₃ , 19 ₄ ,
And a 19 _5.

The input - output 19 ₂ is controlled by the interface circuit 21 - display unit 23
Are connected to the input-output 22. This unit 23
Will be described later.

The input - output 19 ₃ interface circuit 2
4 to the input-output 25 of the coupling unit 26 with the external system. The coupling circuit 26 will be described later.

The input - output 19 ₄ is connected to the storage block 27, the storage block stores the information on the recognition of the individual assigned a device, also records the measured values resulting from the signal from the unit 12. These measurements, input - the time with the connected to the output 19 ₅ clock reference 2
Recorded with the date given by 8.

The unit 23 has a liquid crystal display 30 which produces information on the main surface 31 of the device 10 (FIG. 1). The unit 23 also has a light emitting diode 32 for generating a warning light signal when the dose exceeds a predetermined limit or when the accumulated dose during a predetermined time exceeds an allowable value. Also, this warning or alarm is issued by the sound device 33.
Via sound.

The unit 23 also has an inquiry or data introduction element 34. These elements are shown in FIG.
Will be described in more detail.

The coupling unit 26 can receive information from the outside by a receiving antenna 35, and this antenna 35 is connected to the input-output 25 via a receiving circuit 36 and a changeover switch 37. Set to receive or transmit state.

The coupling unit 26 is connected to a transmission antenna 40 for transferring information to an external system. The antenna 40 is connected to the input-output 25 via a transmission circuit 41 and a changeover switch 37.

The unit 26 is, for example, of the type included in the "TADICARD" system commercially available from Tadyran (Israel).

The coupling of the device 10 to external systems is implemented in other embodiments by optical means or electrical contacts.

The power supply of each circuit of the device 10 is performed by the power supply unit 4.
5, this unit 45 comprises a solar cell 46
And a battery 47, which is charged by a solar cell 46 and provides a power supply 48 for each element of the device.
Act as

In one embodiment, the powering of the coupling circuit 26 may be implemented by the induction of current in a flat coil (not shown) induced by an electromagnetic field near the card.

The control keyboard 34 has three keys 50, 5
1 and 52 (FIG. 1).

The key 50 determines an operation mode. For example, when the key 50 is pressed, the device 30 displays the identification number of the user who owns the device 10. Pressing this key twice causes the device 10 to display the dose (millimetres) accumulated by the holder during a predetermined period. This storage period is determined by pressing the key 51 as described below.

When the key 50 is pressed three times, the detected photon dose rate is displayed. By pressing the key four times in succession, the user can know the difference between the dose received during a predetermined period and the allowable dose during this period. Finally, press the key five times,
The date is displayed and the time setting operation can be performed.

In another embodiment, after the first press of a key, the user is asked for the code number, so the keyboard (not shown) introduces the code number into the device. This keyboard can be digital, alphabetic or alphanumeric. (Similar to a pocket calculator or pocket database). In this case, the key 52
Confirm this code number by pressing. If the code number is incorrect, the information cannot be displayed.

A second key 51 called a scroll key displays various categories of each mode. For example, key 50
When the scroll key 51 is pressed first when the dose is displayed by pressing twice, the dose accumulated in the previous hour is shown. Pressing this key 51 twice will display the dose accumulated over the last 24 hours. Pressing the key 51 three times displays the dose accumulated over the past week. Pressing this key four times displays the accumulated dose over the past month, and pressing the key five times displays the accumulated dose over the past year.
Pressing the key six times will display the total dose accumulated since the measurement of the device holder's exposed dose was begun.

The third key 52 is used to consider or confirm the displayed parameter. This key 52
Is particularly effective for time setting operations and the aforementioned code number confirmation.

The surface of the device 10 has a space 60 for the recognition of the holder, in addition to the liquid crystal display 30, the solar cell 46, the control panel 34 and the sound device 33,
And a photo space 61 for the holder.

Obviously, the type of power supply used is not limited to those described above. Instead of a solar battery, a battery that is charged from a power line can also be used.

The memory 27 of the unit 18 can be used to store the carrier's medical information as well as the carrier's recognition information, for example, information about its blood type or history. In this way, in case of sudden illness or accident , the rescue organization can obtain useful information on the optimal treatment of the patient. This information can be obtained directly by the keyboard 34 or accessed by the antenna 40 or similar connection device.

When the portable device is handed to its holder, the issuing authority of the device records the following information in the memory 27: His name, surname, age and nationality (if appropriate), medical history as described above, occupational information, and last but not least, the maximum allowed dose. This dose can vary from individual to individual, especially with age.

Further, the data in the memory 27 can be updated through the unit 26.

During normal operation of the device,
Time, days, weeks, months, quarters, years and other doses can be recorded. The device can also record changes in dose rate as a data function curve.

In another embodiment, the information on dose and dose rate can be combined with the date as well as the location of the date holder. Such information is immediately and automatically transmitted to the device by the receiving antenna 35, for example. In still other embodiments, the information stored in memory 27 is encrypted in various ways so that access through external systems can be performed only by authorized persons or organizations. For example, encrypt medical and occupational information so that medical information is accessed only by medical institutions and occupational information is accessible only by authorized authorities.

Referring to FIG. 3, an example of the organization of the memory 27 of the circuit of FIG. 2 will be described.

In this memory embodiment, there are four memory blocks. That is, a block 70 for recording and storing daily dose, a block 71 for recording and storing weekly data, and a block 7 for recording and storing monthly data.
2, and a block 7 for recording and storage of annual data
3. Finally, a total memory 74 of the dose received by each person who has been given the badge is provided.

[0064] Block 70 includes a random access memory or RAM 75 _1, the RAM is in the form of a binary number for each date, and records the number of 10 micro-rem dose units received from the circuit 16.

The contents of the memory 75 ₁ are reset every 24 hours, for example, at 0:00.

This memory 75 ₁ is connected to an EEPROM type memory 75 ₂ . This type of memory, unlike RAM, does not require power to store data. In that respect, this type of memory is similar to a read-only memory, but is erased by an electrical signal and can be used for new recording or storage of data after erasure.

[0067] connection from RAM 75 ₁ to EEPROM75 ₂ is made such that the memory 75 ₁ outputs the contents always memory 75 _2.

Following the memory 75 ₂ , the memories 75 ₃ and 75
_4, 75 _6, 75 ₇ and 75 ₈ are connected, all of these memories are EEPROM type memory. These memories 75 ₂ to 75 _8, every 24 hours, for example 0
Sometimes, the contents of each memory are connected in series so as to be sent to the next memory. For example, the contents of the memory 75 ₂ is output to the memory 75 _3, then the contents of the memory 75 ₃ is made to be outputted to the memory 75 _4. Of course, these operations are performed under the control of the microprocessor, and each EEPROM first outputs its contents into the random access memory of the microprocessor, and then this R
The AM is erased and then sent to subsequent memory.

[0069] In this process, the last memory 75 ₈ is not recovered is erased.

[0070] Memory 75 ₂ stores the dose data stored therein day, also subsequent date memory 75 ₃ to 75 _8, respectively, i.e. D-1, D-2 ,. . . D-6
The accumulated dose is stored.

[0071] Block 71 has a random access memory or RAM 76 ₁ similar to the memory 75 _1. This RAM is reset to zero weekly, that is, every seven days. It is connected to the RAM76 ₂ of this RAM Hatsugi.
The contents of the memory 76 ₁ week, are output in the memory 76 ₂ to a particular time on a particular date. Similarly, the other 12 RAs
M73 ₃ to 73 ₁₃ are connected. The data in each RAM is output to the next RAM on a specific day every week. In this way, the memory 76 ₁ stores the accumulated dose data since the beginning of the week W, the memory ₇₆₂ stores the dose accumulated during the next week W-1, the memory 76 ₃ week W -2 to store the accumulated dose, and finally RAM
76 ₁₃ stores the dose accumulated during week W-12.

[0072] During this update operation, the contents of the last memory 76 ₁₃ may be lost. Further, each of the memories 76 ₁ , 76 ₂ . . .
76 _{13 with} respect to the EEPROM 77 ₁ . . . 77 ₁₃ are combined, the EEPROM has the same content as the corresponding RAM. These EEPROMs provide a backup of the contents of the RAM.

Each of the RAMs 76 ₁ , 76 ₂ . . . 76 ₁₃ are the corresponding inputs 78 ₁ . . . Output to 78 ₁₃ , this adder 78 always calculates the sum of the doses stored in these 13 memories. If this total dose exceeds the threshold value _D13S , an alarm is issued.

In the case of the block 71, it is conceivable to use the same structure as the block 70 without overlapping the memories. However, to enable connection to adder 78, R
The presence of AM is preferred.

[0075] Block 72 has a RAM 81 _1, which records the dose accumulated during the month M. This RA
M81 ₁ is connected to the EEPROM 81 _2, the contents of the memory 81 ₂ is equal to the contents of the memory 81 ₁ in each moment.

Further, the unit 72 has 12
Months, January, February. . . Other 12 Es corresponding to December
EPROMs 81 _{3 to} 81 ₁₄ are provided.

The EEPROMs 81 _{3 to} 81 ₁₄ corresponding to the month in which the contents of the memory 81 ₁ have just passed at the end of each month.
Is output to Then, the contents of the memories 81 ₁ and 81 ₂ are reset to zero.

At the end of each year, the EEPROMs 81 ₃ through 8
Content of 1 ₁₄ is reset to zero.

The memory set 73 has a RAM 82 ₁ ,
This RAM records the dose accumulated during the year Y. EEP having the same contents and contrast this RAM 82 ₁
ROM 82 ₂ are combined, also deployed EEPROM82 ₃ to 82 _12, each of these EEPROM stores information about the accumulated year has elapsed dose. Accordingly stores dose memory 82 ₃ is accumulated in the previous Y _1, stores the last information accumulated in the year Y ₁₀ 10 years ago that year.

[0080] Memory 82 ₃ its contents at the end of each year are connected so as to be output in the next memory 82 _4, the content of the memory 82 ₁₁ in this manner is output in the memory 82 _12, Next, the contents of the latter memory are lost.

[0081] Further, the output of the memory 82 ₁ is connected to an input of the comparator 83 constantly compares the dose accumulated in the year and the maximum permissible annual dose D _Y.

As another embodiment, the memories 82 ₃ , 82
₄ ． . . At the end of the first year of using the device without connecting between the devices 82 ₁₂ , the contents of the memory 82 ₁ are stored in the EEPROM 82 ₁₂
Output to Memory 82 ₁ outputs the contents in the memory 82 ₁₁ the following year.

The memory 74 is of the EEPROM type. This memory stores information about the dose that the device holder has accumulated over his lifetime or occupation.

The microprocessor initializes each E at initialization.
The EPROM type memory is programmed to be loaded with a predetermined initial value. Thus, when the holder receives a new card, this card is loaded with all information about him.

Information added to the input of the adder 78 includes information on dose and date. Similarly, the comparator 8
The dose data applied to the input of 3 is combined with the date information. In this construction, the moment of exceeding the threshold D13 _S or D _Y are recorded together with the date.

In each memory, a pair of data, that is, data relating to the dose and data relating to the date are recorded. If each dose is encoded in 16 bits and each date is also encoded in 16 bits, then the required EEPRO
The M capacity has the following value when schematically represented. 32 × (7 + 13 + 12 + 10) = 1.3 × 10 ³ Bit This is a relatively small EEPROM capacity and the RAM capacity is even smaller.

As an example, the device has a contact connected to a modem. In this case, when the holder is away from the management center or the monitor center, the information contained in the device can be transmitted by telephone line.

[Brief description of the drawings]

FIG. 1 is a plan view of a main surface of a device according to the present invention.

FIG. 2 is a circuit diagram of the device of FIG. 1;

FIG. 3 is a diagram of a date memory of the circuit diagram of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Portable device 12 Detection unit 18 Data processing unit 19 Microprocessor 23 Display / control unit 26 External connection system 30 Liquid crystal display 31 Issue date 33 Sound device 34 Control panel 46 Solar cell 60 Last name 61 Photograph

Continuation of the front page (56) References JP-A-64-26180 (JP, A) JP-A-60-42675 (JP, A) JP-A-61-88175 (JP, A) JP-A-57-17892 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01T 1/00

Claims (17)

(57) [Claims] 1. Gamma rays, ultraviolet rays or X
The portable measuring apparatus for measuring dose rate and cumulative dose of photon radiation or charged particles, such as lines, a detector for detecting said photons radiation or charged particles, the photon radiation or charged particles detected by the detector Calculating means for calculating the dose rate and the cumulative dose based on the data; a memory for storing data on the dose rate and the cumulative dose calculated by the holder and the calculating means; and data on the dose rate and the cumulative dose calculated in the memory. Clock that simultaneously stores date information in memory
A calendar and a plurality of cells having different periods , which control storage of the data on the holder, the dose rate, and the accumulated dose in the memory.
The dose received in each of a given number of chronological time periods
The storage data on the dose rate and the accumulated dose is periodically updated so that only the information is stored in the memory, and when the data on the dose rate and the accumulated dose is updated, the data of the dose rate and the accumulated dose that are calculated most recently. And a microprocessor configured to control the memory so that data of the dose rate and the accumulated dose older than a predetermined number of the periods are deleted from the memory. 2. The memory has a daily dose for the most recent period, a weekly dose for the period just passed, a monthly dose for a certain number of periods past the period for storing the weekly dose, and a monthly dose for the oldest period. 2. The portable measuring device according to claim 1, wherein information on an annual dose is stored. 3. The method according to claim 1, wherein the detector, the calculating means, the memory, the clock-calendar and the microprocessor are all stored in a flat package in the form of a standard-size rectangular credit card. Portable measuring device. 4. The portable measuring device according to claim 3, wherein the main surface of the package includes information about a readable holder. 5. The portable measuring device according to claim 1, further comprising a connecting means for connecting to at least one of the data introducing device and the information processing device. 6. The portable measuring device according to claim 5, wherein said connecting means includes a wireless tag type antenna. 7. The apparatus according to claim 1, further comprising means for storing information representing the location of the holder in a memory.
The portable measurement device according to any one of claims 4 to 4. 8. The apparatus according to claim 1, further comprising display means for displaying data relating to at least one of the accumulated dose and the dose rate, and means for manually selecting data to be displayed. 2. The portable measuring device according to claim 1. 9. An alarm device for notifying a holder of at least one of a dose rate exceeding a predetermined limit and a cumulative dose during a predetermined period exceeding a predetermined limit. The portable measurement device according to any one of claims 1 to 4. 10. The apparatus according to claim 1, further comprising means for storing moments when the accumulated dose exceeds one or more predetermined limits, these moments being recorded with their dates. The portable measuring device according to claim 1. 11. The method according to claim 1, wherein the holder is an individual, and the data on the individual stored in the memory relates to the recognition of the individual.
A portable measuring device according to the item. 12. The portable measurement device according to claim 11, wherein the data on the holder stored in the memory further includes medical data of the holder. 13. The portable measuring device according to claim 1, wherein said detector comprises a solid-state sensor. 14. The portable measuring device according to claim 1, further comprising a power supply. 15. The device according to claim 1, wherein the device is placed on an object such as a container of a substance that emits photon radiation such as gamma rays, X-rays or ultraviolet rays or charged particles.
The portable measuring device according to any one of the above. 16. The memory according to claim 1, wherein the memory includes information on the accumulated dose in the first period and information on a second period longer than the first period and older than the first period. Claim 1
A portable measuring device according to claim 1. 17. A portable measuring device for measuring a dose rate and a cumulative dose of photon radiation or charged particles such as gamma rays, ultraviolet rays or X-rays to which a certain place is exposed, and a detector for detecting said photon radiation or charged particles. Calculating means for calculating a dose rate and a cumulative dose based on the photon radiation or charged particles detected by the detector; and a memory storing data on the exposure site, the dose rate and the cumulative dose calculated by the calculating means. A clock-calendar for storing date information in the memory at the same time that the data of the dose rate and the cumulative dose are stored in the memory; and controlling the storage of the data of the dose rate and the cumulative dose in the memory, and having a cycle. A predetermined number of different types
Note only the information on the dose received in each chronological period
The data on the dose rate and the accumulated dose is periodically updated so as to be stored in the memory, and when the data on the dose rate and the cumulative dose are updated, the latest calculated dose rate and the accumulated dose data are stored in the memory. And a predetermined number of said
A microprocessor for controlling the data of the dose rate and the accumulated dose older than each period to be erased from the memory.